Roubaix Tech: Special Edition Felt F1
The efforts to tame the cobbles of Paris-Roubaix have included everything from running lower tire pressure in 28mm tires to wrapping the handlebar with foam pipe insulation and even using cyclocross bikes. The cyclocross bikes have been a less than stellar option for a few reasons. First, they’ve been chosen because the standard race bikes from the teams’ sponsors have allowed clearance for 28mm tires; in some cases they won’t even allow 25mm tires. Second, they feature geometries that include high bottom brackets (for pedal clearance) when the average Roubaix rider wants a lower BB to make the bike easier to handle over the bumps.
Felt has taken a novel approach to meeting the needs of their sponsored riders. For this year’s Paris-Roubaix, the Argos-Shimano team rode on a special run of the company’s F1 frames. How these frames differ from a standard F1 might surprise you. Unchanged is the bike’s layup and stiffness, which many might guess would be the first concession made to the cobbles. In fact, the changes are deeper in the DNA of the machine.
Felt’s engineering team changed the geometry of the F1—giving it handling and tire clearance perfect for the cobbles—without cutting new molds. Seems like an impossible trick, huh? Let’s cover the changes to the geometry and the rationale for it and then we’ll get into just how they did it.
The F1 seen above features head and seat tube angles a full degree slacker than the stock bikes. They also have a 10mm longer front center and 13mm longer chain stays to keep the weight distribution virtually unchanged. Felt’s engineers also managed to drop the bikes’ BB height by 3mm even after the addition of 28mm tires. And of course, the modified the fork and the rear triangle to create clearance for those bigger tires.
Again, the amazing thing here is that they managed all these changes without cutting new molds for bikes that will essentially be raced once a year. So how’d they do it?
They designed new dropouts that moved the rear wheel back and up (relative to the old position) which dropped the rear end of the bike and increased the wheelbase of the bike. Up front, new dropouts raised the fork crown and increased the rake, compensating for the decrease in head tube angle to keep trail consistent. The slacker seat tube angle allows riders to sit back a bit more, shifting some weight off their upper bodies to give their hands, arms and shoulders a bit of a break.
And to compensate for the changes to the fork and rear triangle, non-series Shimano long-reach calipers handle the stopping duties.
This isn’t the first time Felt has done this. In 2008 when they were sponsoring Garmin-Chipotle, which included Magnus Backstedt pictured above, Felt produced a run of F frames for the team. Those frames also featured Felt’s “Superstiff” layup, a feature that wasn’t required this time around as the new F1 is both lighter than the previous F1 (standard layup) and stiffer than the Superstiff layup.
While Trek and Specialized realize excellent marketing benefits from putting their sponsored teams on the new Domane and established Roubaix, Felt’s approach yields a bike more purpose built to the racers’ requirements. Both the Roubaix and Domane feature more trail than their racier counterparts. What’s most surprising here is that more companies haven’t had the insight to create a second set of dropouts to give their top-flight race bikes more versatility. Maybe this will help illustrate just how bright Felt’s head of engineering, Jeff Soucek, and his team are.