These Ultegra-level cranks use Shimano's outboard bearing technology.
They arms are cold forged of forged TRX50 aluminum. The outer chainring is 7075 aluminum with ramps and pins to facilitate smooth shifting. The inner chainring is hardened steel for long life.
If you currently have a Shimano Dura-Ace, Ultegra or 105 "10-speed" double crankset, this crankset will directly replace it with no need to change any other parts!
If you are replacing a traditional "three piece" crank, you'll also need a pair of outboard bearing assemblies.
Bulletproof BMX cranks can be used as a single or double chainring setup.
These use the highly versatile 110 mm bolt circle, and fit standard tapered-square bottom bracket axles.
Chainline w/107 mm bottom bracket:
- 43.4 mm as double (middle of spider)
- 47.1 mm outer ring
- 39.7 mm inner ring
- 158 mm tread ("Q factor")
530 grams/pair (165 mm)
Arms only, no bolts nor chainrings included.
Lengths available:
140 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm
