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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
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
Sorry bud.... going a bit quick there....Right.Bottom brackets sizes curiously seem to be named based on geography, for example;YorkshireSpanishEuroUSAIn other words, the name depicts the size. There is only one size of USA BB, but there are two different designs, to suit crank types.So, your actual crank arm assembly will be only one of two types. The one piece crank which as its name suggests is a single lump of steel that looks like a big letter 'S'.Or,The three piece crank which comes as individual parts; 2 crank arms and an axle to join them together, hence the name three piece crank.So what you need to do is:a) determine what size BB shell the frame has. I think we're all agreed it is USA sized. No threads and around 2" in diameter.b) identify the crank as either one or three piece.c) go out and buy said BB4) come back here so we can give you the lowdown on fitting it all together So, do you have a crank already, or do you need to buy one?Three piece cranks are the better made stronger setups mostly, one piece cranks are the cheaper option and most people would say I reckon, the crank more identifiable to BMX. I'd certainly never seen one till BMX hit my town way back when....You crank decision if you need to buy one will affect your BB decision.Crank first, BB to suit afterwards.Hope that helps, feel free to bombard us with questions
gunna add to the confusion now,what axle will you be running if your going 3 piece?some are 19mm or 22mm19mm are the majority but primos for example are 22mmand to answer your last question1PIECE3 PIECEpriv