With the UCI allowing teams to test disc brake road bikes in two races this fall, Cervelo needed something for Team MTN Qubeka to ride.
The all-new Cervelo R3 Disc is that bike, and it’s both very similar and completely different than the standard rim brake model bearing the same name.
They wanted to keep the race geometry and handling since it’s going to be tested at the highest level under MTN Qubeka. The problem was, they had to widen the chainstays to fit the 135mm rear hub spacing that disc brake hubs use. And that can throw off the chainline. Most other brands simply extend their chainstays to accommodate the wider axle spacing, which is usually necessary to maintain proper shifting. There are specific recommendations from Shimano regarding the amount of chain deflection from chainring to cog. If it’s too much, the chain can start to pick up the chainring ramps too early, potentially limiting the number of usable gears or negatively impacting drivetrain performance.
Cervelo found a way to keep the chainstay length exactly the same…