Octalink BB sizing

Hi all
My BB has finally packed in after 2 years. It's an Shimano Octalink jobby on my '08 Spesh FSRxc.
Not wanting to waste any time I looked on the Specialized website and the specs stated it as 68x118 so I ordered that a few days ago. Got round to taking out the old one last night and it says 68x121 on the body of the BB. Aaaaarrrgh! :evil:
I also noticed there was a shim between the frame and the cup thread head on the drive side that was a few mm thick.
Basically is 3mm difference in length going to make that big a difference to my chain lines (is it 1.5mm each side or 3mm of the drive side?).
Any advice welcome.
My BB has finally packed in after 2 years. It's an Shimano Octalink jobby on my '08 Spesh FSRxc.
Not wanting to waste any time I looked on the Specialized website and the specs stated it as 68x118 so I ordered that a few days ago. Got round to taking out the old one last night and it says 68x121 on the body of the BB. Aaaaarrrgh! :evil:
I also noticed there was a shim between the frame and the cup thread head on the drive side that was a few mm thick.
Basically is 3mm difference in length going to make that big a difference to my chain lines (is it 1.5mm each side or 3mm of the drive side?).
Any advice welcome.
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and i would be getting another BB.
Parktools :?:SheldonBrown
http://www.chainreactioncycles.com/Mode ... odelID=908
10 quid, job done!
VOODOO CANZO
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Don't use the spacer this time.
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
That's what I thought myself and that's the exact one I was looking at last night, was just hoping to get out and ride this weekend by using the 118.
SS: Why not use the spacer when I'm replacing it with the same sizes?
Right, time to see how good are CRC returns are...
The 118 may work - but I remember very well what happend when I put a 118 in my Zaskar frame when 121 was specified for the correct chanline - the inner chainring tabs fouled the frame!
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
Think I'll not risk it and get another one. More days off the bike...
Could it be a question of checking the clearance? Some frames may have more than plenty chainring clearance, and 3mm is not that much?
What's the final word on this Nick?
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
So i got one of the BBs that S'sonic has a link to from CRC as a replacement. Went to fit it last night and I can't get the plastic sleeve on the non-drive side to screw all the way in - it ends up with about 2mm of thread still exposed.
I've tried it without the BB in place and it does go all the way in so the only thing stopping it is the BB shell. I've had all my (considerable) weight on my wrench and it just won't go in all the way.
Any ideas?
but just to be sure back the BB out from the drive side a bit and then tighten the ND cup and then go back to the D side.
the Drive side face could be out and moving the BB in the BB shell .
Parktools :?:SheldonBrown
Just wanted to check.
Woo, I cab get back on my bike!
Parktools :?:SheldonBrown
Just to clarify guys. I have fitted two of those ES51 BB to my other bike and can confirm that the plastic cap (non drive side) doesn't screw all the way in , I too have a 2mm gap or thereabouts.
Orange 5 AM Custom