We've made some small changes to our classic 50.4mm BCD cranks MK 1. They have improved chainrings and there is now more room between the arms and chainrings for easier front derailleur setup. The arms are also stiffer but a tiny bit lighter.
Classic 50.4 BCD cranks like the TA, Stronglight 49D and others are still sought after by randonneurs and cyclo-tourists. These cranks offer tremendous versatility (chain rings from 28t to 62t fit). They are also light and have narrow Q-factors, or tread.
While the new Grand Cru crank looks like the classics, we have made several important improvements. They are cold forged 7075 aluminum alloy. The rings are thicker so they don't flex as on classic cranks. The BB taper and all threading is common sizes (fits square taper BBs) - no need for special tools and BBs. The rings have modern shifting aids, so shifting performance is much improved.
Here are the highlights:
About bottom brackets: Most road frames use a 118mm BB. Bikes with 135mm spacing and room for big tires may need a 122 BB with a spacer.
Available in 165mm, 170mm, and 175mm lengths.