My bottom bracket does not fit, is it ok ?

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Trebz

Active Member
Hi all

Just bought a new Shimano UN54 for my recently acquired Orange P7.

The bottom bracket shell on the frame is 68mm wide so i bought a 68-73mm bottom bracket.

When the bottom bracket is fitted the left hand side plastic thread cup does not tighten fully up to the frames bottom bracket shell.

Is this ok?
 

fossyant

Ride It Like You Stole It!
Location
South Manchester
Some don't go all the way flush, but I would check the cranks are equal distance from the centre of the BB.

Sent from my HTC Desire using Tapatalk
 

Cubist

Still wavin'
Location
Ovver 'thill
If I remember correctly a 68-73mm BB comes with three spacers, and on a 68 you fit one spacer to the left side, and two spacers to the right side. Have you fitted the spacer on the left side?
 

I like Skol

A Minging Manc...
When I bought a UN54 BB a couple of months ago the thing I specifically remember (apart from the fact that supplies seem to be drying up?) was that all the sizes where specified by BB shell width of either 68 or 73 and by axle length (eg. 113, 122 etc). I don't recall seeing any that suggested a variable shell width capability.
 

Reluctant

Guest
Skol's right. A UN54 square taper bb comes with no spacers. It needs to be specific to a shell size, ie. 68 OR 73 - not both. Supplies of UN54 are running out, but guess what! There's a UN55 available so nothing to worry about ^_^
 

02GF74

Über Member
isnt it left side first right side second ?
not the ones i've seen - the RH side cup (in sitting postion facing forwards), has a shoulder so can only be fitted in one positon, the cup is tightened until the shoulder is agaisnt hte bottom brakcet- this is to ensure the chain is in line - the LH side has no shoulder and is sometimes plastic - that is done up until the bearing is snug in the cup.
 
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