Bottom bracket size?
I have an old bike with a measured bottom bracket width of 116 mm. It needs replacement. I can only find 115 mm and 118 mm width bottom brackets. Which one is a better replacement?
I got two conflicting answers online so far. One says it is okay to be either + or -1mm, but another says I should go for the larger size because it will just space the pedals farther apart.
- 3 weeks ago
it's very important to make sure you get the correct bottom bracket for the job. With so many “standard” sizes available, it may seem overly complicated
- DavidLv 61 month ago
Well, how did the crank arms sit with the old BB?
If there was a decent gap between crank and BB shell, and between cranks and chainstays, then you could PROBABLY use the 115 mm BB.
If it was a tight fit anywhere with the old BB, go for the longer one.
Be advised that BB/crank fit can be tricky. Parts that SHOULD fit might not.
Also, what do YOU like?
There’s a kinda-sorta advantage to running short ones, but the big thing is you being comfortable on the bike.
- Sidewinder JerryLv 61 month ago
Without knowing what the bike is, how do you expect anybody to answer the question? Take the bike to a reputable bicycle shop. There they can best answer your question.Source(s): Motorized bicycle owner and builder.