New Trek Procaliber Gen3 2025: The race hardtail with an extra portion of comfort

Behind the Trek Supercalibre the Procaliber model may have recently faded somewhat into the background of the cross-country public. Now the carbon hardtail is taking a big step out of the shadows and shines not only with a new design, but also with a completely revised concept. In its third generation, the Trek Procaliber should be more versatile than ever before thanks to 120 millimetres of travel on the fork and a fresh geometry. Trek is also getting rid of the IsoSpeed rear triangle. In its place is the new IsoBow concept, which is designed to give the Hardtrail extra comfort and efficiency despite the unsprung rear end. The brand new Procaliber is aimed at XC racers of all skill levels, weight-conscious mountain bikers, comfort-conscious riders with a preference for rough gravel trails and bikers looking for an attractive price-performance ratio. We have all the information on the new Trek hardtail.

Details on the Trek Procaliber Gen3 2025

• Area of application: Cross Country / Marathon
• Suspension travel: 120 mm
• Wheel size: 29"
• Frame material: Carbon
• Weight: from 10.58 kg (manufacturer's specification)
• Price: from 1999 Euro
• Special features: IsoBow rear triangle, geometry update

Hardtail with more comfort and less weight thanks to Trek IsoBow

Already at the outgoing Generation Two of the Trek Procaliber a special rear suspension concept provided more controlled flex on the unsprung rear triangle. The old IsoSpeed technology provided more comfort thanks to a decoupling unit integrated into the frame, but had a slight weight disadvantage compared to other high-end hardtails. The successor concept goes by the name of IsoBow and should offer the same advantages as IsoSpeed both in the laboratory and in practice, but weigh significantly less. Instead of a shock absorber including a pivot point, the flex is now provided by the frame layout itself. On the new Trek Procaliber Gen 3, there is a gap at the transition from the top tube to the seat stays and in front of the seat tube. This IsoBow area is intended to form a flex-optimised unit as a closed unit. The seat stays are virtually continued beyond the seat tube.

With the new IsoBow technology on the Trek Procaliber, the Americans promise a controlled compliance of the carbon frame at the crucial point. On the XC course, racers should benefit from less fatigue, which, according to Trek, should result in more endurance and efficiency. As the hardtail now has fewer moving parts, the Procaliber Gen3 is also expected to be more durable. In their own blind tests, racers are said to have noticed no difference between the function of IsoSpeed and IsoBow. However, there is one decisive difference: the new frame made of lightweight carbon weighs around 200 grams less than the second generation chassis. A considerable weight saving, which is also due to the absence of the Knock Block steering stop limiter. According to the manufacturer, the frame of the Trek Procaliber Gen3 weighs 1150 grams.

Geometry update for the cross-country hardtail from Trek

The new Procaliber Gen3 frame naturally comes with modernised XC geometry. The suspension fork now provides more travel, namely 120 millimetres, and is 67 degrees slacker. This means that the steering angle of the new hardtail is a remarkable 1.8 degrees slacker than its predecessor. In frame size L, the reach value increases by ten millimetres for more control at high speeds. To increase efficiency on steep climbs, the seat angle has been designed half a degree steeper and now stands at 74.3 degrees. All equipment variants should do justice to the new geometry expertise with Vario seatposts and 750 millimetre wide handlebars. Great for long-distance, marathon and touring use: all five frame sizes offer space for transporting two bottles and also come with a tool mount under the top tube, to which a small frame bag can also be attached.

Overall, the geometry update should give the Procaliber reactive handling, but still give the bike more reserves for race runs at the limit. In this way, the industry giant wants to bring its carbon hardtail back on a par with the already revised aluminium model and the Procaliber. the very successful Fully Trek Supercaliber Gen2. The latter was not only voted the most popular marathon bike of 2024 by BIKE readersbut also has a floating mount for the rear brake caliper, which the Trek Procaliber Gen3 now adopts. By decoupling the braking forces from the frame, the engineers want to eliminate their influence on the rear suspension flex. Not only should the seat stays be able to flex more freely and offer more comfort, but braking should also be more efficient.

>> We have already been able to test the Trek Procaliber in its latest aluminium version

Models and prices

In addition to the two already known aluminium models of the Trek Procaliber Gen3, three carbon versions are now rolling onto the market. These all have the same carbon frame and 120 millimetres of travel at the front, but differ in their equipment and therefore also in their prices and weights. Each equipment variant comes in two colour options. Another nice feature is that all models are supplied tubeless.

Trek Procaliber 9.5 Gen3

• Price: 1999 Euro >> available here
• Weight: from 12.13 kg
• Equipment: Rockshox Judy Gold / Shimano Deore / Bontrager aluminium wheels

Trek Procaliber 9.6 Gen3

• Price: 2499 Euro >> available here
• Weight: from 11.08 kg
• Equipment: Rockshox Reba RL / Shimano SLX-XT-Mix / Bontrager aluminium wheels

Trek Procaliber 9.7 AXS Gen3

• Price: 4499 Euro >> available here
• Weight: from 10.58 kg
• Equipment: Rockshox SID / Sram GX AXS Eagle Transmission / Bontrager carbon wheels