Originally Posted by
IcedEarth27
Thnx for the replay. I'm actually thinking of bidding on this one here
FSA GRAVITY GRID crankset 175mm including BB | eBay
It says it supports both 68 and 73mm. One of the reasons i was concerned is cos I thought that those numbers show the diameter of the threads and it wouldnt fit but now I'm believing it has to do with the length of the BB (or am I still wrong)?
Im not interested in tools to change it as I'll go into a local shop to change it. I'm looking to pick one that fits to buy.
You could ask your LBS to help find a bb and crank. They will have the experience to know what you need. It's hard to know what to buy without the right tools. There are 3 things to consider for the bb:
1) bb shell width (a frame measurement-usually 68mm or 73mm
2) bb spindle width
3) bb interface-square taper, octalink or ISIS.
Its hard to find that out without a caliper. The chairing on the crank also need to support the # of speeds on the cassette (more gears will be a narrower chain), pedal axle width, and bb threading (either English threaded or Italian usually).
Dave