For a bike that is so capable on the descents, though, the Top Fuel still packs a mighty punch when it comes to gaining elevation. On the technical climbs, it was very similar to the Rocky in terms of speed, but both were pipped by the ground-hugging missile that is the Santa Cruz Blur TR. In fact, by our reckoning, it's the most efficient bike on test. The bike is very surefooted and tracks very well, although I would say it's more suited to people who want a bike that responds well to accelerations and surges in power, rather than having a very active suspension system that lets the wheel get up and over obstacles easily. It doesn't ride like a heavy bike, but if you're looking for all-out lightweight, this might be a very small stumbling block. The Top Fuel is a very good climber, even if it's slightly heavier than something like the Santa Cruz Blur TR or the Rocky Mountain Element. That means switching to a 'regular' stem requires a special adaptor, an inconvenience that doesn't seem like it should be necessary. However, I don't feel it's as well-executed as other brands' offerings, mainly due to the fact that it uses keyed headset spacers that fit into notches in the stem. The new Knockblock widens the range of the steering inputs and is an improvement on previous versions. The bottle cage on this bike comes as standard. This includes internally guided routing, a SRAM UDH, and a bottle inside the front triangle. All the normal suspects are there in terms of frame spec. Assuming all other things are equal, the additional 10mm would reduce the head and seat tube angle by around half a degree. The bike is also compatible with a longer 130mm fork. That said, our fork did develop bushing play, something that's unfortunately happened before on other SID test forks. Truly, both the SID and the new 34 really do help bikes like this fulfill their potential. The fork was exemplary in terms of performance and really opens up what you can ride on a bike like this by giving adequate support.
We ran the shock in its most open setting and found it to be very well damped for somebody that wants to push on. A SID fork featuring their Charger Race Day Damper and an inline Deluxe shock covered damping duties. Our bike came with a RockShox pairing for the suspension. Dare I say it, its door seems maybe one of the best executed of all the mainstream brands, and there's ample volume inside. The 27mm rise bars are certainly elegant to say the least.Īnother feature of this bike that Trek seemed to have got right is their integrated storage. The bars came in a very wide 820mm width, which we duly cut down, and has an effective stem length of 45mm. It's a very sleek looking bike, and that's before you take into account the rather beautiful Bontrager RSL one-piece bars and stem that came on our test bike. The bike uses Trek's ABP suspension layout, and benefits from the clean silhouette that the design enables. The bike uses 29" wheels for all models except the extra-small in its range. Although this is 2 and 4mm less than the Rocky Mountain and Niner respectively, the Trek feels longer because the bars are that bit lower.Īt the rear of the bike, it has the near-standard 435mm chainstays that are very common in this category. It's certainly very adequate, but the long reach, combined with a 76-degree seat tube does give it a moderately long effective top tube length of 630mm. Yet it's not the steepest in the seat tube angle. In its high setting, it has a reach of 484mm. The dimension of stack can not only have a large effect on the handling of the bike, but also what terrain the bike will thrive in. Its stack figure is around 25mm lower than the Niner, for instance, and that's not even factoring the high-rise bars that come on that bike. The Top Fuel has one or two geometry dimensions that set it apart from the others, most notably it's a lot lower on the front than some of the other bikes. However, it's not quite as radical as something like the Rocky Mountain Element, nor is it as tall at the front as something like the Niner Jet RDO, both of which we also tested. Its slack head angle and long reach seem to have been plucked from bikes with far burlier intentions. To look at the geometry chart, it becomes clear that the Top Fuel is a fascinating prospect.