Custom bike Rock Lobster CXCustom - is the customised frame worth it?

Henri Lesewitz

 · 30.09.2023

The slim silhouette reveals that the frame of the Rock Lobster is welded from steel. The fork is made of carbon fibre.
Photo: Henri Lesewitz.
Crown of perfection or just self-made stress? Custom projects like the Rock Lobster are fascinating, but don't make sense for everyone.
Custom bikes are considered the ultimate. But this is not true across the board. A customised bike can be the dream bike you've been hoping for. But it can also be a nightmare. Using the example of his custom gravel bike Rock Lobster CX, our author reveals what is important when it comes to customisation.

An off-the-shelf bike or a customised bike directly from the manufacturer? Anyone looking for something special will sooner or later be faced with this question. Custom bikes are considered the ultimate. But that's not true in general terms. A customised bike can be the dream bike you've been hoping for. But it can also be a nightmare. Our author wanted the perfect gravel bike and decided in favour of a custom project despite the risks. Here he reveals whether he was happy in the end, the steps involved in creating his Rock Lobster CX and what is important when it comes to customisation.

All made to measure: A custom frame is tailored to the customer's body with millimetre precision. Steel, aluminium and titanium are the ideal materials for this. Carbon frames require expensive moulds, which is why they are hardly ever manufactured as one-offs.Photo: Paul SadoffAll made to measure: A custom frame is tailored to the customer's body with millimetre precision. Steel, aluminium and titanium are the ideal materials for this. Carbon frames require expensive moulds, which is why they are hardly ever manufactured as one-offs.

There is no light without shadow. My grandma used to say that. That basically applies to everything. Even for bicycles. Series production trimmed to quantities keeps sales prices low. The more, the cheaper, is the formula. However, the geometry, equipment and appearance are all geared towards the needs and requirements of the average buyer. To a certain extent, mass-produced bikes are bikes for Erika and Max Mustermann. If you have a physique like Mrs or Mr Mustermann and their taste, then an off-the-peg bike is a good choice. If you want something more individual, you can optimise a standard bike with tuning parts. But if it comes down to the last per cent, there is hardly any way around custom-made bikes. But beware! Just because a bike is a one-off doesn't necessarily mean it's better than a standard model. Whether a customised bike really is a dream bike depends not only on the frame builder, but also on you. You can't just click a custom bike into your shopping basket. It is the result of a lengthy development process, which often begins with a vague idea on the part of the customer.

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Cult welder Paul Sadoff in front of his workshop in Santa Cruz, California.
Photo: Stefan Utz
Welding legend Paul Sadoff has been building customised frames since 1978. His forge Rock Lobster in Santa Cruz, California, is a one-man operation.

Step 1: Choosing a partner. If you are not familiar with the world of frame builders, you will be surprised at how many custom forges there are. This doesn't exactly make it easy to decide where the frame should be built. Geometry philosophies, working methods, waiting times, material preferences, design language and prices differ enormously. Good knowledge or in-depth research is essential to find the right address.

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As someone who has been interested in custom bikes for almost three decades, I fortunately know my way around. But also with the pitfalls. Not only once have I been disappointed at the end of a lengthy project. Too soft. But not the optimum geometry. A botched paint job. All this can happen under certain circumstances. Extensive inspection and test rides are largely impossible with custom production. That's why you shouldn't experiment when choosing a forge. I'm sticking to this principle this time. Because the bike I have in mind should merge with me into a kind of man-machine and provide great touring experiences. A gravel bike. Robust and reliable, but also agile and sporty. One that doesn't look like others, but doesn't look quirky. Classic, but modern at the same time. With a name that makes connoisseurs nod in recognition. It is to be a gravel bike from the Californian cult forge Rock Lobster, which has been manufacturing customised frames since 1978. The company is a one-man operation. Owner Paul Sadoff is a cycling enthusiast through and through and an old-school frame builder. He has built hundreds of frames over the years. From steel as well as aluminium. More experience is not possible.

Pros and cons of custom bikes

  • + Perfectly customised to your own needs
  • + Exclusive look including customised paintwork
  • + Maximum sustainability, built for eternity
  • + Often hardly more expensive than mass-produced bikes
  • - No test drive possible
  • - Usually longer waiting time
  • - Good knowledge of material and geometry required
  • - Risk of a bad purchase
A garage workshop as you would imagine it: The workshop looks a little rumpy, but it is precisely this charm that delights fans of the brand. It is the perfect contrast to the high-end factories of the large-scale manufacturers.
Photo: Paul Sadoff
The Rock Lobster forge looks as if time has stood still. The impression is both true and deceptive. The bikes from the Californian manufacturer are still among the finest that the custom market has to offer.

I first read about Rock Lobster in the mid-nineties. There was a portrait story in BIKE magazine about a likeable, crazy US welder who was also an avid guitar collector. The lead photo showed the then young Paul Sadoff playing a guitar with a seat post. The caption is indelibly etched in my memory: Paul Sadoff works on a National Steel Guitar from the forties with a Campa seatpost from the seventies. Legendary!

Step 2: The consultation. In autumn 2022, I got in touch with the brand's importer. His name is Stefan Utz and, in addition to Rock Lobster, his company Cycleworks also distributes the bikes of the equally iconic US brand Foes. What struck me immediately was the euphoria that my enquiry triggered in Stefan. As it turned out, he, like me, was deeply influenced by the early MTB phase in the early nineties. For him, Rock Lobster distribution seemed to be more of a passion than pure business. And so it is. Distribution is his two-fold business, born out of his hobby, biking. The rough parameters were immediately clear after the first exchange. The frame material should be steel and the rear triangle should offer space for 45 mm tyres. Stefan estimated that the frame would cost around 1800 euros. Waiting time: about three months. But before he could send the order to Paul Sadoff, the most difficult question had to be clarified: Which geometry?

Stefan Utz is the importer of Rock Lobster and actively helped with the project instead of just emailing through the order. He advised and supported the development of the geometry. This was very helpful, as Paul Sadoff is based on the other side of the globe.Photo: Henri LesewitzStefan Utz is the importer of Rock Lobster and actively helped with the project instead of just emailing through the order. He advised and supported the development of the geometry. This was very helpful, as Paul Sadoff is based on the other side of the globe.

Step 3: The geometry. Working out the geometry is the most delicate phase of a custom project. If just one detail is wrong, it can ruin the character of the entire bike. Everything depends on it. How the bike handles. Whether you feel comfortable on it. Whether the pedalling is effective or your knees hurt. Whether the water bottles are well positioned, whether the tyres have the desired width in the rear triangle, or whether something is dragging. To be on the safe side, I thought about simply taking the geometry of a bike that suited me. The Canyon Grail AL, for example. I had test ridden the bike shortly before and felt comfortable on it. Stefan recommended using this geometry as the basis for a refined custom geometry. He also had a specialist ready for the tinkering: Reto Trachsel, the owner of the Swiss frame manufacturer Revlrevl Cycles. A mate of Stefan's and, like him, an ardent mountain bike enthusiast.

The geometry specialist: Reto Trachsel is a mate of Stefan Utz and a frame builder himself. He worked out the geometry of the Rock Lobster. In the photo he is holding a replica of the legendary Yeti C26 in his hands, which he produces in small batches together with Stefan.Photo: Henri LesewitzThe geometry specialist: Reto Trachsel is a mate of Stefan Utz and a frame builder himself. He worked out the geometry of the Rock Lobster. In the photo he is holding a replica of the legendary Yeti C26 in his hands, which he produces in small batches together with Stefan.

Reto first asked me about the type of riding I wanted to do and what I intended to do with the bike. I told him about my planned bikepacking adventures and long-distance day tours. The geometry proposal he sent a few weeks later was tailored to this down to the smallest detail. Bikers with a penchant for geometry details would probably want more detailed explanations at this point. Reach, stack, standover height and so on. I'll keep it short and sweet. Reto's recommendation was a longer top tube, a slightly shorter stem and a slacker head angle. In practice, the bike would ride more or less like the Canyon Grail AL. Only smoother. And more relaxed in terms of the riding position. That sounded great. I gave the go-ahead.

The measure of all things: The geometry was based on the Canyon Grail AL. Reto adapted the dimensions to the area of use and the preferences of our author. The picture shows the final proposal.Photo: Henri LesewitzThe measure of all things: The geometry was based on the Canyon Grail AL. Reto adapted the dimensions to the area of use and the preferences of our author. The picture shows the final proposal.

Deep inside me, a hint of nervousness remained. What if theory and practice turned out to be two different things? In order to test ride the bike, I would first have to buy all the parts and assemble the frame. What a shock it would be if the bike turned out to be a cucumber after all the effort and money invested.

Modern technology makes it possible: just days later, the construction plan was printed out on Paul Sadoff's workbench. After months of theory, the production of the frame began.Photo: Paul SadoffModern technology makes it possible: just days later, the construction plan was printed out on Paul Sadoff's workbench. After months of theory, the production of the frame began.

Step 4, the frame construction. I didn't hear anything for a few weeks. Then one Thursday, an email from Paul Sadoff rushed into my mailbox. He wanted to get started on Monday, he wrote, and still had a few questions. What kind of gear I wanted to ride. Whether the cables should run inside or outside. Whether I wanted to install a bottom bracket with press-fit cups or one with classic BSA cups. Whether I wanted mounting options for luggage racks. And what colour the frame should be. I emailed the answers. However, I asked for some time to think about the colour. As always with such projects, the choice would be both a joy and a pain. Thousands of possibilities and a different idea every day. I decided to order a RAL colour fan.

Eight tubes and a sleeve: this will be a frame in just a few days. Before the welding needle can glow, the tubes still have to be cut to shape. Paul used a mix of Columbus and True Temper tubes for the Gravel project.Photo: Paul SadoffEight tubes and a sleeve: this will be a frame in just a few days. Before the welding needle can glow, the tubes still have to be cut to shape. Paul used a mix of Columbus and True Temper tubes for the Gravel project.

Another e-mail from Paul on Tuesday. The first photos! It was like being there at a birth. Thanks to smartphones and the globally networked internet, as a customer you are almost there live when your dream frame is created. It's a fascinating experience to see how the new treasure takes shape step by step. How the tubes lie on the workbench in their raw state. How they are cut to size. How they are clamped in the frame jig. And, and, and. An exclusive, VIP-like pleasure that buyers of production bikes are not granted.

The rear triangle with the boldly curved seat stays. The heat of welding has discoloured the steel at the seams like a rainbow.Photo: Paul SadoffThe rear triangle with the boldly curved seat stays. The heat of welding has discoloured the steel at the seams like a rainbow.

New photos arrived at daily intervals. I particularly liked the rear triangle with the elegantly curved seat stays and the subtly curved crossbar. You could clearly see how regular and fine the weld seams were. Finest precision work. Just as I had hoped for. Nevertheless, I was constantly worried that the subsequent riding impression could destroy the illusion of the perfect frame.

In contrast to the other pipe connections, the cable guide is soldered in. This guarantees a discreet appearance and material-friendly processing.Photo: Paul SadoffIn contrast to the other pipe connections, the cable guide is soldered in. This guarantees a discreet appearance and material-friendly processing.

Step 5, the paintwork. After a few days, the picture of the finished welded frame arrived. It was still clamped in the frame jig, but you could already get an idea of what the bike would later look like. Paul wanted to know what colour the frame should be painted. The thought that my decision would determine the look of the bike for many years to come stressed me out. For weeks, I had sat there night after night with the RAL fan. I had talked shop with my mates and looked at hundreds of photos of bikes on the internet. But I was undecided. Muted reseda green, i.e. RAL 6011? Or classy silk grey, RAL 7044? Or the trendy dahlia yellow, RAL 1033. After much deliberation, I decided on the classic Rock Lobster colour: RAL 6019, white green.

Finished welding! The photos sent by e-mail of the progress of the work sweetened the day like a Christmas calendar.Photo: Paul SadoffFinished welding! The photos sent by e-mail of the progress of the work sweetened the day like a Christmas calendar.

Again, it took a few weeks. The desired Enve fork was not available for a while, Paul wrote. But now the set is ready for dispatch. A feeling of great joy flowed through me as I looked at the photo. So this would be my companion for future adventures.

It's an incredibly intense feeling when you see your future frame in all its glory for the first time. The anxious question: Will the bike ride as well as the frame looks?Photo: Paul SadoffIt's an incredibly intense feeling when you see your future frame in all its glory for the first time. The anxious question: Will the bike ride as well as the frame looks?

The parcel arrived two weeks later. I shredded the cardboard like crazy. The frame was wrapped in brightly coloured foil. The black and yellow Rock Lobster lettering shone through matt. With a mixture of impatience and longing, I peeled layer after layer off the frame until I finally held it in my hands. What a piece of jewellery! But the anxious question still hovered over everything: Was it all worth it?

What a masterpiece! The frame is exactly as we dreamed it would be. But it is still unclear whether it will be a good bike in the end.
Photo: Henri Lesewitz
A few months ago it was nothing but a dream, now it's actually tangible. It's a solemn, but somehow also surreal moment when the frame arrives. First take a photo.

Step 6, the assembly: For custom freaks, putting together the parts is half the fun of a customisation project. Those who are not quite so familiar with the parts jungle can easily make mistakes. If in doubt, the same applies here: No experiments. Exotic lightweight parts may exude great visual fascination. In practice, they can quickly turn out to be diva-like. For me, a good bike is characterised by the fact that it lets the rider reel off kilometres in peace. I decided to only use solid components. Although Sram's Force drivetrain in the AXS version works wirelessly and with an electronic servomotor, it has a reputation for being absolutely reliable. I can confirm this from my own experience. The hydraulic brakes of the Force groupset are powerful and have a good pressure point. The headset should be from Chris King and the hubs from Industry Nine, as both US manufacturers stand for durable, sustainable products. I also selected all the other parts according to the main criterion of reliability.

The first step is to press in the Chris King headset, for decades the cult part for all those who value sustainability and longevity. What an ingenious coincidence that the part is available in a version with yellow lettering.Photo: Henri LesewitzThe first step is to press in the Chris King headset, for decades the cult part for all those who value sustainability and longevity. What an ingenious coincidence that the part is available in a version with yellow lettering.

The assembly took some time. This was also because some of the assembly work required special tools that are rarely found in private mechanics' cellars. The press-fit tool for the headset, for example. Or the bleeding set for the brakes, which is necessary as soon as you have to cut the brake cables to feed them through the frame or fork. If you don't have a lot of experience in this area, you should definitely commission a trusted workshop instead of messing around yourself. In the meantime, almost a year had passed from the idea to the almost finished bike.

When building a custom bike, unexpected problems can pop up. Everything fits here thanks to good planning. The project is slowly approaching the home straight.Photo: Henri LesewitzWhen building a custom bike, unexpected problems can pop up. Everything fits here thanks to good planning. The project is slowly approaching the home straight.

All that was missing were the wheels. And again the question was: buy complete wheels or build them myself? I decided: If it's possible, then it's possible! An uncompromising custom bike needs custom wheels. What many people don't realise: The choice of wheels has an enormous influence on the bike's handling. Every detail counts. What properties the spokes have. How they are spoked. Crossed or radial. How high the spoke tension is. What rim width the rims have and what material they are made of. A science in itself. I philosophised for hours with my mate Michi, who knows a lot about the subject, about the perfect solution. It finally looked like this: Carbon rims from Reynolds, Industry Nine hubs and, to top it all off, the classy, wickedly expensive titanium spokes from Pillar in a shimmering rainbow look. Storage: Classic crossed.

Ready to click into place! The new piece of jewellery is ready. Will it fulfil the high expectations?
Photo: Henri Lesewitz
Voilà! The Rock Lobster is ready for its maiden voyage. The moment of truth. Was it worth the effort, or would a production bike have done the trick?

Step 7, the final adjustment: When the handlebar tape was wrapped and the last screw tightened, I was overcome by a pleasant feeling of pride and satisfaction. But also of emptiness. After months of everything revolving around the creation of the dream bike, there was now nothing left to do. The task was gone. There are many custom builders who can't really enjoy the sight of the finished bike. For them, it feels like looking at a finished jigsaw puzzle. Pretty, yes. But they would love to take it apart again and start all over again. But not everything is done yet! The final adjustment of the components may take some time. Optimising the seating position is like an all-round fitting. Handlebar position, brake lever position, seat height, saddle position: you have to feel your way millimetre by millimetre. That's why I don't consider the first time I sit on the bike to be my maiden voyage, but rather part of the development process. However, the initial feeling when riding back and forth in front of the house suggests that the project may have been worthwhile. Everything seems to fit.

The relief is almost as great as the joy: the bike fits like a glove.
Photo: Henri Lesewitz
The first ride on a custom bike is a magical experience. At least when everything is just as you imagined it would be. Our author was so enthusiastic that he immediately ventured into tougher terrain on the brand new Rock Lobster.

Step 8, the maiden voyage: Almost a year has passed since I exchanged initial ideas about the bike with Stefan and Reto. The eagerly awaited maiden ride is due to take place today. To maximise the celebratory feeling, I waited until the warmest and most beautiful day of the week. The tool is ready to hand in my jersey, as experience has shown that I will make homeopathic corrections to the saddle position and handlebar position during the first few kilometres. The route is a mix of gravel tracks, root trails and short ups and downs. Like magma that first billows and then bursts through the rocky crust in fountains, a real euphoria sweeps through me after just a few kilometres. Everything feels perfect. The way I sit on the bike. The way it responds to my pedalling with speed. The way it glides effortlessly over the rough surface. A magical moment.

The bottle is empty, the new bike covered in dust: a successful maiden voyage.Photo: Henri LesewitzThe bottle is empty, the new bike covered in dust: a successful maiden voyage.

CONCLUSION: Is a custom bike with a customised frame worth it?

A custom project can cost time, money and nerves. Nevertheless, for me it is the best way to achieve my dream bike. The be-all and end-all is experience. Whether geometry, cable routing or equipment: everything has to come together perfectly in the end. If just one detail isn't right, you can end up with a cucumber. However, if everything fits, then you have a bike that suits your needs all round. So: Don't rush it! Take your time! Consult experts! I would advise people with little experience to buy a standard bike. You can test ride it and optimise it with tuning parts if necessary. - Henri Lesewitz, BIKE Reporter
BIKE reporter Henri Lesewitz has his bikes customised whenever possible. Preferably made from titanium or steel.Photo: Henri LesewitzBIKE reporter Henri Lesewitz has his bikes customised whenever possible. Preferably made from titanium or steel.

Rock Lobster CX

  • Frame: Steel (Columbus Zona and True Temper OX)
  • Fork: Enve Gravel CX (Carbon)
  • Impellers: Industry Nine hubs, Reynolds carbon rims, Pillar spokes
  • Tyres: Donnelli X'plor 45 x 700c
  • Gear system: Sram Force AXS
  • Cranks: Sram Force
  • Headset: Chris King
  • Handlebars: Ritchey WCS Venture Max (carbon)
  • Stem. Ritchey WCS (aluminium)
  • Support: Tune (aluminium)
  • Saddle: SQlab 611 Ergowave
  • Brakes: Sram Force
  • PRICE FRAME: 1800 Euro

Custom bikes: 10 tips for those interested

  1. Find the basic geometry: In order to have a rough basis for the custom geometry, it is best to test ride different bikes. What do you like, what don't you like? These findings can then be discussed with the frame builder.
  2. Good frame builders do not simply ask for the desired geometry data, but work out the overall concept of the bike together with the customer. To do this, the frame builders almost always determine the most important body measurements, such as stride length, forearm length, etc. If the frame builder does not take the time to do this in detail, you should be sceptical.
  3. A custom bike should meet your own requirements 100 per cent. In order for it to do this, however, you first need to know exactly what you expect from the bike. Looks should not be the most important criterion. Even if the paintwork and nice details naturally make up a large part of the appeal: The riding character ultimately decides whether the bike is enjoyable or not.
  4. What will the quality of the frame be like? This is often difficult to estimate in advance. After all, the frame is still in the making. Reviews on the internet are one thing. You can find out more in special forums where the specialists hang out.
  5. When buying bikes and frames from faraway countries, it is essential to bear this in mind: There is also import tax and expensive shipping costs.
  6. Does the brake fit the mount? Is the installation height of the fork correct? Don't really place an order until every last detail has been thought through.
  7. Custom projects are a temptation for unusual paintwork. Of course, this is often what makes a bike unique and there are many painters who specialise in artistic frame designs. In most cases, so-called wet paint is used. The quality has improved over the years. However, classic paint is nowhere near as robust and resistant as powder coating.
  8. The cost of a customised frame cannot be specified in general terms. The price depends on the material and complexity. Simple steel frames cost from around 1200 euros, more elaborate ones up to 2500 euros. Stainless steel frames cost about the same. Titanium starts at around 3000 euros.
  9. Tip for savers: If you're on a budget but still want a bike with measures, you can buy a well-equipped standard bike and just swap the frame (plus a few parts if necessary). Practical: The sale of the original frame cushions the cost of the customised frame. And you can get a complete bike at a very favourable price. The shop prices for components are usually extremely higher than the prices that the manufacturers pay for the parts.
  10. And then: enjoy the overwhelming feeling of riding a bike that was built just for you - priceless!

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