Technical & Reference Section > Tech and Restoration
oversized bottom bracket!!
wadagangker:
as a few of you may know, i am building a bmx from scratch (just frame). I have been enquiring around about a bottom bracket and have been told that i need an "oversized bottom bracket". i didnt really understand what the hell this guy was talking about :wtf:, but he said there is pretty much only 2 sizes of bottom bracket and i need the bigger one?!?! can anyone shed some light onto this? all i know is that the hole where the BB goes is quite big!! and there is no thread there (as this was one of the questions i was asked when enquiring). I would greatly appreciate any suggestions or any help people could offer.
RATTY:
The one you probably want is a USA bottom bracket, it has no threads and the bearing cups just push in to the frame.
TwoBobRob:
What is your frame? If its old school and the BB shell looks around 2" in diameter, then Ratty is right, You need a US BMX bottom bracket. It's gotta suit your crank obviously, so you'll ask for either a one piece or three piece BB when you order.
I did hear on here somewhere that some Mongoose cranks and BBs are different to the norm? I don't know a thing about this other than the threads are different i think. If you're running a Mongoose one piece crank, then a bit more research is in order I think :)
wadagangker:
--- Quote from: TwoBobRob on March 16, 2008, 12:47 PM ---What is your frame? If its old school and the BB shell looks around 2" in diameter, then Ratty is right, You need a US BMX bottom bracket. It's gotta suit your crank obviously, so you'll ask for either a one piece or three piece BB when you order.
I did hear on here somewhere that some Mongoose cranks and BBs are different to the norm? I don't know a thing about this other than the threads are different i think. If you're running a Mongoose one piece crank, then a bit more research is in order I think :)
--- End quote ---
the frame is an apollo (yes i know their crap) im trying to prove a point to someone that i can turn a piece of crap halfords bike into something to be proud of!!
TwoBobRob:
That'll be a US BB.
So all you need to do now is match you BB type to the crank. Of course if you're going posh, then a brand new three peice crank will come complete with a BB and you needn't worry ;)
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