What size BB

mojopete

Dirt Disciple
Bearing surfaces worn so need a new one.

Ita an old Tange, JIS square taper, standard 86mm, but I can't decide on the overall lenth. wWithout the ue of calipers, (which I haven't got as I'm Billy-no-mates as far as bikers are concerned), :( its either 122mm, 122 1/2mm or 123mm. So is 1mm critical if I get it wrong and is it better to go a mm over than under.

And I suppose the new sealed type would be a lot better.

Pete.
 
Essentially 1 or 2 mm is nothing. Shimano ones are probably the easiest to source: a UN54 or (if you can find one) UN72/73 are the simplest choice.
 

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