Product Story

When Paul suggested we bring back our classic 100% Pure Cranks, but with an updated design featuring a 3-bolt direct-mount chainring spline and self-extracting crankbolts, we got excited. When he suggested JIS Square-Taper for the bottom bracket, we were like, “Uh, square-taper in 2025? I dunno…”

But a funny thing happened once we started mounting and testing prototypes. We realized we could really fine-tune the Q-factor and chainstay clearance of the crankarms via BB spindle length, then we could get the chainring nice and close to the chainstay for better chainline in the bigger rear cogs via chainring offset (0, -3, -6). Q-Factor nerds rejoice!

Crankbolts, extractor caps, and chainring bolts are included. Bottom bracket and chainrings are not. Read the instructions (included, or in the Technical Information above) to help determine chainring offset and bottom bracket length.

PAUL 100% Pure cranks are designed around a splined 3-Bolt SRAM chainring interface, which is designed for multi-speed and single-speed ratcheting freewheel applications. We do not recommend using these cranks with fixed-gear applications. The interface between the chainring and crankarm has inherent tolerances that do not comply with forward and reverse torque applications. (If you find a chainring that is snug on the spider, it might work O.K., but due to potential play leading to loosening, we cannot recommend running these cranks with a fixed gear.)