Bottom Bracket Help (yep another one!)

Cogsy1976

Hi
I have just bought an on-one inbred frame and intend on swapping all of the parts that I can from my Cube Hardtail however Im a bit confused on the Bottom Bracket! I know the shell size is 68 which is the same as the Octalink BB I had on the cube. However the axle length is too long at 123mm and I need 113mm.

My question is can I just buy a shorter BB and still use this with the chainset? or would I need to buy a whole new chainset that is that length? its a Shimano octalink one, I was going to completely change the groupset but to keep costs down I think I would like to use as much as I can from the old frame (which is only a few months old)

Sorry if its a stupid question!!

cooldad

It will fit. Can't comment on the axle length.

The Rookie

Cogsy1976 wrote:

Hi
However the axle length is too long at 123mm and I need 113mm.

Shorter are available, but what makes you think you need a 113mm?

Axle width required is determined by the chainline required and the crankset, as you have the same rear wheel, you'll almost certainly want pretty much the same chainline, so your current cranks and BB will almost certainly be fine if they were working before!

Cogsy1976

I emailed on-one who did say that it was prob too long but does depend on the crankset.

The Rookie

Measure your current chainline..... 47.5 and 50mm are 'most common'.

Cogsy1976

Its too late for that as I have stripped the bike lol, I will just try it and see.
Cheers for your help

nicklouse

Cogsy1976 wrote:

I emailed on-one who did say that it was prob too long but does depend on the crankset.

so you dont want to change anything other than the frame?

then your current BB and cranks will be fine.

The Rookie

Cogsy1976 wrote:

Its too late for that as I have stripped the bike lol,

So you can't measure from the fixed face on the driveseide flange where it buts to the BB shell?

With Nick, unless your old bike was wrong, the new one will be right, and no more wrong!

Cogsy1976

Yeah basically I have kept the crankset, cassette, shifters, front mech (although will have to change this as the diameter is smaller) and the rear mech.

Was going to upgrade it all but thought it was pointless as only 3 months old and a waste of money.

Cheers for your help guys I thought it would be different on a different frame

The Rookie

Nope.......well it can be, but not in this case.

mrmonkfinger

Cogsy1976 wrote:

front mech (although will have to change this as the diameter is smaller)

you can get adaptors (if your old tube was big and new one is small)

http://www.ebay.co.uk/itm/Shimano-Front ... 51a74c3e93