I have a 2010 Specialized Tricross Sport Triple. I want to know what type and size of Bottom Bracket I need to replace the original one.
Specialized's archived page for this bike lists the BB as a "BB-7420 w/crank bolts". From what I've read online, this is a British threaded, square tapered, 68mm BB.
From what I've read elsewhere online, a common replacement for this is the Shimano BB-UN55, at around $15 CAD online. However, I haven't found a consensus about what length the Tricross needs. Here someone says 118mm for the 2011 Tricross; Bikepedia lists 113mm for the 2010.
Is there any way to figure that out without taking the bottom bracket out to read the specs off of it?
And is there any other spec beyond the threading, width, taper style, and length, that I need to ensure compatibility?
Finally, if there's a better replacement than the BB-UN55, I'd be curious to know about it. I'd like to stay under $50 CAD.