Trek Procaliber SL, Top Fuel and Fuel EX 29 revamped

Significant changes made to line-up of cross-country race bikes

27.5 29er All Mountain Trail Cross Country
Trek Procaliber 9.8 SL the only place that you'll see cables, is in front of the handle bar. Photo by Jeroen Tiggelman

Trek Procaliber 9.8 SL the only place that you’ll see cables, is in front of the handlebar (click to enlarge). Photo by Jeroen Tiggelman

Trek Procaliber SL FAQ

Is the IsoSpeed decoupler the same one found on the Domane?
The IsoSpeed decoupler on the Procaliber SL is similar to the decoupler on the Domane, but it’s been tuned specifically for the rigors of off-road use, as well as for use with a traditional 31.6 seat post rather than a seat mast system.

What wheel size is on Procaliber SL?
Being a cross-country bike where speed and efficiency matter, Procaliber SL gets Smart Wheel Size for the fastest wheel that fits. Larger sizes from 17.5 and up get 29” wheels while the 15.5 gets more proportional 27.5” wheels.

What does “SL” stand for?
Super Light.

How much rear travel does IsoSpeed provide?
Procaliber SL is a hardtail and hardtails don’t have rear travel. However, IsoSpeed does allow for compliance through the seat tube. There’s a key difference in how IsoSpeed performs vs “soft tail” designs. Most soft tails gain vertical compliance through the seatstays, but the compromise is a loss of overall frame stiffness. Trek’s IsoSpeed decoupler allows the seat tube to pivot and flex independently of the seatstays, gaining energy-saving vertical compliance without compromising stiffness and pedaling efficiency. It’s a smarter way of smoothing out the trail.

Depending on the magnitude of the impact, rider weight, and riding style, a rider could experience up to 11mm of compliance as measured from saddle to rear axle.

Trek Procaliber 9.8 SL Shimano Deore XT front brake with 160 mm disc. Photo by Jeroen Tiggelman

Trek Procaliber 9.8 SL Shimano Deore XT front brake with 160 mm disc (click to enlarge). Photo by Jeroen Tiggelman

How much more vertically compliant is the frame than the Superfly SL?
Our advanced analysis team has confirmed that Procaliber SL is 30% more vertically compliant than the previous Superfly SL which was already engineered to be a very compliant bike. The Procaliber SL is 70% more vertically compliant than the existing Superfly which will be comparable to other hardtail competitors.

How much does the frame weigh? How much weight is added by IsoSpeed?
The 17.5” Procaliber SL frame with paint and hardware weighs 1012 grams, about 100g more than the Superfly SL. Our riders confirm that the 30% increase in vertical compliance is worth the 100g weight increase.

Does Procaliber SL feature front and rear Boost hub spacing?
Yes! Procaliber SL’s equipped with 29” wheels benefit from both Boost110 up front and Boost148 in the back. This gives Procaliber SL stiffer wheels for maximum efficiency and control while also allowing us to shorten up the chainstays and provide more tire and chain ring clearance.

Does the fork have G2 Geometry?
Yes. All 29er-equipped Procaliber SL models feature forks with a 51mm offset for the best 29er handling.

Is the frame Di2 compatible?
Di2 will cleanly integrate with any Procaliber SL frame thanks to our Control Freak cable management system.

Can I run an internally-routed dropper post?
Yes! Control Freak cable management system allows riders to internally route any combination of cables or hoses for a clean, customized set up.

What is that hole in the bottom of the downtube?
It’s part of the Control Freak cable management system. The port under the downtube allows the use of a zip tie to secure the internally routed hoses so they don’t rattle inside the frame.

Trek Procaliber 9.8 SL an unused port of the Control Freak Cable Management System. Photo by Jeroen Tiggelman

Trek Procaliber 9.8 SL an unused port of the Control Freak Cable Management System (click to enlarge). Photo by Jeroen Tiggelman

Is the Procaliber SL available in Project One?
Yes! Procaliber SL will be available in Project One August 2015 so discerning riders can fine-tune their spec details and choose paint to match their own style.

What’s the largest 1x chainring I can run?
Procaliber SL can handle up to a 36T if you can handle it.

Is this the same bike Trek Factory Racing used earlier in the season?
Our Trek Factory Racing squad has been riding and testing several prototype and early production models since the beginning of the race season in February. This is the culmination of all that testing and feedback.

Will it be available as a frame?
Yes! Procaliber SL frames will be available in the stock 9.9 paint scheme.

Continue to page 4 for the Trek Top Fuel FAQ and a full photo gallery »

About the author: Jeroen Tiggelman

Jeroen is a contributor based in Belgium. He is expert in the field of photography and a fan of local beer.

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  • Olivier says:

    Great to see you folks from mtbr were here in the Netherlands! I was not aware of this event or I would have loved to attend. I live nearby and am happy that these trails have now gotten some international attention!

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