Moderator: Moderator Team
In the 5 bolt crankarms you can choose between standard (110-74) and compact (94-58)? These numbers are the measurements of the distance between the bolts I believe but do they have anything to do with yhe size off your bottom bracket spindle ?
All answers are welcome
Manufacturers choose to design cranks like this because if your a heavier rider, you'll want a 5-arm crank for stiffness. It'll be significantly stiffer then a 4-arm crank, and much stronger while pedaling on impacts from roots, drops, etc.
Also, this principal comes from the ROAD BIKE. Road bikes use 5-arm cranks because their gearing is so high, that when your in a big ring and hammering, the chain wants to twist the ring right off the crank. The 5-arm stiffens it up, and reduces flex (which can cause your chain to rub the front derailleur or other chain rings).
But are you sure they dont extend inward from the chain rings, and what about arms that bolt on would they be innies and fixed arms be outies
four arm are plenty stong so its a better choice on cranks , standard (110-74) or compact (94-5) have nothing to do with the bottom bracket.