The new Driveline Mountain Bike cranks are a game changer for big and tall and even small riders. This crankset delivers excellent durability with ultimate compatibility across almost all bottom bracket types, and is available in super short and super long lengths. These custom length mountain bike cranks feature a Sram 3-bolt direct mount system for single chainring installation or use with a spider for 2x compatibility. They come with a proprietary 30t 1x narrow-wide boost chainring but many other chainring and spider options are available. The Driveline mountain bike cranks use a 24mm spindle, which makes them compatible with Shimano hollowtech and FSA mega exo bottom brackets. A BSA threaded bottom bracket is included with these cranks, and they can be adapted to almost any bike by ordering the appropriate bottom bracket for your bike. To figure out which bottom bracket your bike needs, go to the specs page on your bike manufacturer's website or contact your dealer. Then browse our extensive inventory of bottom brackets and add the correct one to your cart.  .