Join Date: Jul 2003
Location: Norfolk, England
Bikes: Orbea Enol roadie, Fly Micromachine BMX, Fort Track fixed
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A BMX rear hub with a couple spacers would be great for a narrow back end (110mm OLN on BMXs), but not so good for 130 or 135. BMX flip flops are have regular freewheel threads on one side, and smaller threads on the flip for 14t or 15t ACS freewheels, useful if you don't like fixed and want a bigish gear difference (18t and 14t). Beware that most BMX hubs come in only 36h and 48h, some only with 48. But for what it's worth, unless you're very tough on hubs or want a 9t sprocket, BMX cassette hubs aren't worth it; road or MTB cassettes are a much better buy.
As for the cranks, make sure that your crankset of choice is available with a Euro BB. Some BMX cranks use square tapers, which presumably would fit a normal cartridge BB, but many use a 48 splined spindle with seperate bearings and cups, and there are some other spindle interfaces available that are unique to that brand. Luckily, there are only 2 or 3 spindle diameters, so one company's BB may well fit another's spindle (Profile Euro BB and Odyssey Black Widow cranks for instance).