Bottom Bracket (square taper)

[JackHarper]

As above I'm after a Shimano cartridge BB for my Courier Comp. I've been looking and measuring for the last hour and I'm still not 100%.

68mm x 121mm BC 1.37

Just out of interest am I right in saying you can't get 121mm now, and you have to buy 122.5mm, if so is it alright?

 

[The Rookie]

Correct.......

 

[Fatal Swan]

Does it have to be Shimano? The 122.5 RPM ones are under a fiver (inc. postage!) from CRC: http://www.chainreactioncycles.com/Mode ... elID=22376

Shimano UN26's are £9 there.

 

[FluffyChicken]

That's the size to get (I assume some early 90 or 80's crank ?) and if you want new just get a UN54 from say CRC.