Technical & Reference Section > Tech and Restoration
oversized bottom bracket!!
Rombloke:
yip usa bb
Dave
wadagangker:
--- Quote from: TwoBobRob on March 16, 2008, 12:54 PM ---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 ;)
--- End quote ---
so i need a usa BB? do they come in different sizes? what do you mean match the BB to the type of crank?
TwoBobRob:
Sorry bud.... going a bit quick there....
Right.
Bottom brackets sizes curiously seem to be named based on geography, for example;
Yorkshire
Spanish
Euro
USA
In 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 BB
4) 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 :daumenhoch:
wadagangker:
--- Quote from: TwoBobRob on March 16, 2008, 06:37 PM ---Sorry bud.... going a bit quick there....
Right.
Bottom brackets sizes curiously seem to be named based on geography, for example;
Yorkshire
Spanish
Euro
USA
In 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 BB
4) 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 :daumenhoch:
--- End quote ---
Hi mate. great advice, cheers for that. :daumenhoch: no i dont have a crank yet i just have a hole!! so does it matter wether i get a 1 piece or a 3 piece crank? you said i need to identify the crank as 1 or 3 piece, how do i do this? cheers bud. Dan :Great_Britain:
priv:
gunna add to the confusion now,what axle will you be running if your going 3 piece?
some are 19mm or 22mm
19mm are the majority but primos for example are 22mm
and to answer your last question
1PIECE
3 PIECE
priv
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