Passer alle krank drev om hverandre?

104 er fortsatt den vanligste boltsirkeldiameteren. Men heller ikke SRAM er konsekvente. Eksempelvis har XX1 og X01 forskjellige BSD, merkelig nok.

X01 and XX1 crankset comparisons

Like the SRAM XX1 crankset, the new X01 has carbon fiber crank arms. The primary difference between the two sets is their bolt circle diameter, or BCD. The X01 crank uses a slightly larger BCD than XX1, making the chainrings the only items that aren’t cross-compatible between SRAM’s two 11-speed mountain bike groupsets.

According to SRAM, the 76mm BCD rings and spiders used on XX1 are significantly more expensive to produce. To keep the price in check, SRAM opted to use a simpler and easier-to-produce 94mm BCD for X01. The aluminum X1 cranks we’ve seen specced on 2014 bikes such as the Scott Genius LT 700 650b also share this 94mm bolt pattern.

You’d also better start working on your hill intervals, as there will be no 28T chainring option for the new group. X01 chainrings sizes will be 30, 32, 34, 36 and 38.

While we’re on the subject of chainrings, it appears that SRAM has taken note of the growing number of companies (including Race Face and e*thirteen) producing aftermarket chainrings with a stepped tooth profile similar to the X-Sync design.

Not one to sit by and lose out on sales, SRAM will offer X01 level chainrings in the very common 104mm BCD pattern. This should be good news for riders looking to piece together a 1x drivetrain using cranks they already own.