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Transition Regulator e-mountainbikesSX or CX? Double whammy for trail fun

Florentin Vesenbeckh

 · 13.03.2025

Two SX, two CX: the new range of Transition Regulator bikes.
Photo: Transition Bikes
So similar and yet so different: Transition presents two new e-mountainbikes, the Regulator CX and the Regulator SX. Both are designed to excel on challenging trails and be great fun downhill. The drive concept is completely different - although both bikes come with a Bosch motor.
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At first glance, the two new e-mountainbikes from Transition are almost identical - but a closer look reveals clear differences. However, they both have one thing in common: the Regulator SX and Regulator CX are designed to impress as versatile all-rounders for demanding trails - and be a lot of fun in the process. The all-mountain e-bikes come with 160 mm suspension travel on the fork and 150 mm on the rear triangle and, according to the manufacturer, should offer particularly playful and dynamic riding behaviour. Transition describes the Regulator as an "all-mountain workhorse", which should be suitable for a wide range of trails. Technical single trails should be just as much on the menu as flow trails and bike park use. Thanks to the two different motor variants, there are options to suit different tastes - from maximum support to a more natural riding experience.

Same same, but different: Transition Regulator CX (left) and Regulator SX (right). Who can recognise the differences?Photo: Transition BikesSame same, but different: Transition Regulator CX (left) and Regulator SX (right). Who can recognise the differences?

Two drive variants from Bosch

The name suffixes SX and CX give it away: the Regulator is offered in two versions with different Bosch drives. This is a novelty, as the Americans had previously offered bikes with Shimano (Transition Repeater), Fazua (Transition Relay) or Sram motors (Transition Repeater PT) on offer. But not with Bosch.

In order to keep the down tube as slim as possible, the chassis was adapted precisely to the respective battery size, 400 or 600 Wh. The batteries cannot simply be removed.Photo: Transition BikesIn order to keep the down tube as slim as possible, the chassis was adapted precisely to the respective battery size, 400 or 600 Wh. The batteries cannot simply be removed.

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For bikers who want maximum power and range, the Regulator CX is available with the Bosch Performance Line CX motor. This delivers a maximum torque of 85 Nm and a peak output of 600 watts. The Powertube 600 battery, which is integrated in the down tube, serves as energy storage.

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The Regulator SX and Regulator CX rely on the minimalist "System Controller" LED display from Bosch. And both Transition bikes are obviously already prepared for a new display generation from Bosch.Photo: Transition BikesThe Regulator SX and Regulator CX rely on the minimalist "System Controller" LED display from Bosch. And both Transition bikes are obviously already prepared for a new display generation from Bosch.

If you are looking for a lighter e-MTB, you can opt for the Regulator SX with the Bosch Performance Line SX drive. This motor weighs around 800 grams less and delivers a maximum torque of 55 Nm with a peak output of 600 watts. The battery has a capacity of 400 Wh. According to Transition, the Regulator SX should therefore ride almost like a non-motorised mountain bike. The classic promise of the light category.

The Bosch drives on both bikes are controlled via the wireless mini-remote.Photo: Transition BikesThe Bosch drives on both bikes are controlled via the wireless mini-remote.

The permanently installed battery on both regulators can be extended with the Bosch Power More 250, an additional 250 Wh battery.

The batteries are permanently installed in the down tube. The optional Power More 250 increases the range and Transition has come up with something special for the cable routing.Photo: Transition BikesThe batteries are permanently installed in the down tube. The optional Power More 250 increases the range and Transition has come up with something special for the cable routing.

The similarities Regulator SX/CX

  • Frame material: Carbon
  • Suspension travel: 160/150 mm
  • Wheel size: Mullet, 29/27.5 inch
  • Permanently installed battery
  • Option for Bosch PowerMore 250 range extender
  • Two equipment variants for 7999 or 9990 euros
  • Four frame sizes Small to X-Large
  • Growing chainstays (442 mm in S and M, 448 mm in L and XL)
  • Lifetime guarantee
  • Classic cable routing in the frame
  • Motor control via Bosch Mini-Remote and system controller
The cables on the new Transition Regulator run classically behind the head tube into the inside of the frame.Photo: Transition BikesThe cables on the new Transition Regulator run classically behind the head tube into the inside of the frame.
Both Regulators rely on a classic four-bar rear triangle with a vertical shock. This is how we have known the Transition fullys for years.Photo: Transition BikesBoth Regulators rely on a classic four-bar rear triangle with a vertical shock. This is how we have known the Transition fullys for years.

Transition Regulator CX

Even if the two bikes look very similar at first glance: The Regulator SX and Regulator CX have completely independent frames. The down tube of the CX is thicker to accommodate the Powertube 600. This is permanently installed and can only be removed from the bike for servicing with a great deal of effort.

New in the Transition portfolio: The new Bosch Performance CX.Photo: Transition BikesNew in the Transition portfolio: The new Bosch Performance CX.

>> Click here to test the Bosch Performance Line CX!

In terms of equipment, the Regulator CX is at the upper end of the trail and all-mountain category. With a thick ZEB fork, downhill strength and robustness are at the top of the priority list. Nevertheless, the bike should remain light. Transition specifies 21.3 kilos for the top model in frame size M - that would be a really heavy weight for a Bosch CX bike with a 600 battery and downhill-orientated equipment.

The Transition Regulator CX in the colour white.Photo: Transition BikesThe Transition Regulator CX in the colour white.

A unique feature of the CX version is that the geometry can be customised using a flipchip. This changes the angle by 0.5 degrees and the bottom bracket height by 5 millimetres. Overall, the geometry is rather moderate to give the bike a manageable handling behaviour. Special feature: The chainstays grow with the frame size. They measure 442 mm for frame sizes S and M and 448 mm for L and XL. Apart from the flip-chip adjustment option, the geometry of the Regulator CX and Regulator SX is virtually identical - although the SX is orientated towards the steeper position of the CX.

The geometry of the Transition Regulator CX in the four sizes S to XL.Photo: Transition BikesThe geometry of the Transition Regulator CX in the four sizes S to XL.The geometry of the Transition Regulator CX can be fine-tuned using the flip chip on the shock mount.Photo: Transition BikesThe geometry of the Transition Regulator CX can be fine-tuned using the flip chip on the shock mount.

Transition Regulator SX

The SX version not only relies on the lighter Bosch drive system with SX motor and Powertube 400, but also pays a little more attention to weight when it comes to the other equipment. With Lyrik instead of ZEB and a lighter tyre combination, the weight of the top model should land at 18.7 kilos. That would also be a really strong figure.

>> Click here to test the Bosch Performance Line SX!

The top version of the Transition Regulator SX is said to weigh just 18.7 kilos.Photo: Transition BikesThe top version of the Transition Regulator SX is said to weigh just 18.7 kilos.The Bosch Performance Line SX is powerful in a light comparison, but not exactly compact.Photo: Transition BikesThe Bosch Performance Line SX is powerful in a light comparison, but not exactly compact.The geometry of the Transition Regulator SX in the four sizes S to XL.Photo: Transition BikesThe geometry of the Transition Regulator SX in the four sizes S to XL.

Models, prices and availability

The Regulator CX is available in two equipment variants, as is the Regulator SX. The prices of all versions are not exactly in the bargain range, which is normal for the cult brand Transition. They start at 8000 euros. Each variant is available in two colours: Blue and white for the CX, orange and grey for the SX. The four bikes will be available in Germany and Austria from the beginning of April.

Transition Regulator CX Deore - 7999 Euro

The Deore version of the powerful CX for 7999 euros has a Rockshox Domain Gold RC fork with 160 mm travel and a Rockshox SuperDeluxe Base shock. Shifting is provided by a 12-speed Shimano Deore groupset and the brakes are also from the Shimano Deore range.

The Transition Regulator CX Deore is expected to cost 7999 euros.Photo: Transition BikesThe Transition Regulator CX Deore is expected to cost 7999 euros.
  • Motor: Bosch Performance Line CX
  • Battery: Bosch Powertube 600
  • Fork: Rockshox Domain Gold RC (160 mm)
  • Shock absorber: Rockshox SuperDeluxe Base
  • Gear system: Shimano Deore M6100 12-speed
  • Brakes: Shimano Deore M6120 4-piston
  • Handlebars: Raceface Chester 35 aluminium

Transition Regulator CX XT - 9990 Euro

The higher-quality XT version costs 9990 euros and is equipped with a Rockshox ZEB Ultimate fork and a Rockshox SuperDeluxe Ultimate shock. A Shimano XT 12-speed drivetrain is used here.

The Transition Regulator CX XT for 9990 euros with Rockshox ZEB Ultimate.Photo: Transition BikesThe Transition Regulator CX XT for 9990 euros with Rockshox ZEB Ultimate.
  • Motor: Bosch Performance Line CX
  • Battery: Bosch Powertube 600
  • Fork: Rockshox ZEB Ultimate (160 mm)
  • Shock: Rockshox SuperDeluxe Ultimate
  • Gear system: Shimano XT M8100 12-speed
  • Brakes: TRP DH-R EVO
  • Handlebars: OneUp Carbon

Transition Regulator SX Deore - 7999 Euro

The lighter Regulator SX is also available in two equipment variants. The Deore version rolls on a Rockshox Lyrik Base fork and a Rockshox SuperDeluxe Select shock. The gears and brakes come from the Shimano Deore range, plus aluminium add-on parts.

The "cheaper" light bike, the Transition Regulator SX Deore, also costs 7999 euros.Photo: Transition BikesThe "cheaper" light bike, the Transition Regulator SX Deore, also costs 7999 euros.
  • Motor: Bosch Performance Line SX
  • Battery: Bosch Compacttube 400
  • Fork: Rockshox Lyrik Base (160 mm)
  • Shock absorber: Rockshox SuperDeluxe Select
  • Gear system: Shimano Deore M6100 12-speed
  • Brakes: Shimano Deore M6120 4-piston
  • Handlebars: Raceface Chester 35 aluminium
  • Cranks: Raceface Aeffect R

Transition Regulator SX XT - 9990 Euro

The XT version offers a Rockshox Lyrik Ultimate fork in combination with a Rockshox SuperDeluxe Ultimate shock. As with the CX, the gearing is 12-speed with Shimano XT, and the new TRP DH-R Evo should provide deceleration. The cranks and handlebars are made of carbon, which should reduce the weight to under 19 kilos.

By far the lightest bike in the new range is the Transition Regulator SX XT for 9990 euros. This also makes your wallet a little lighter.Photo: Transition BikesBy far the lightest bike in the new range is the Transition Regulator SX XT for 9990 euros. This also makes your wallet a little lighter.
  • Motor: Bosch Performance Line SX
  • Battery: Bosch Compacttube 400
  • Fork: Rockshox Lyrik Ultimate (160 mm)
  • Shock: Rockshox SuperDeluxe Ultimate
  • Gear system: Shimano XT M8100 12-speed
  • Brakes: TRP DH-R EVO
  • Handlebars: OneUp Carbon
  • Cranks: Raceface Era Carbon

Florentin Vesenbeckh

Florentin Vesenbeckh has been on a mountain bike since he was ten years old. Even on his very first tour, he focussed on single trails - and even after more than 30 years in the saddle of an MTB, these are still the quintessence of biking for him. He spent his youth competing in various bike disciplines and later his cycling career was characterised by years as a riding technique coach. Professionally, the experienced test editor now focusses on e-mountainbikes. In recent years, the qualified sports scientist and trained journalist has tested over 300 bikes and more than 40 different motor systems in the laboratory and in practice.

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