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PostPosted: Fri Sep 06, 2013 6:43 pm 
MacRetro rider
MacRetro rider

Joined: Tue Mar 29, 2011 6:06 pm
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Location: Roamin' in the gloamin'
Ok, bought my Colnago superissimo on ebay. Mid 80's SR chain set running on Chorus sealed bb. Recently developed a wee wobble, so stripped it to find coke can shims spacing the drivevside crank. When I tried to refit without the shim the inner ring was virtually touching the stay. Removed bb and measured axle at 117mm which seems like it should be long enough. Am I another victim of jis vs iso?
Read a bit and I know campag changed to iso late 80's/90's so is my chorus iso and SR cranks jis? Crank tapers are still fine so that's not the trouble. Either way I need a new bb.

Opinions and advice please.


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PostPosted: Fri Sep 06, 2013 7:23 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
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Yup, SR cranks are JIS so will sit further inboard on an ISO taper by about 4-5mm


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PostPosted: Fri Sep 06, 2013 7:38 pm 
MacRetro rider
MacRetro rider

Joined: Tue Mar 29, 2011 6:06 pm
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Location: Roamin' in the gloamin'
That's what I thought. Easy fix at least before any damage done to cranks.
Thanks.


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PostPosted: Sat Sep 07, 2013 12:16 am 
rBoTM Winner
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Location: California
Um just for clarification bu SR do you mean Sakae Ringko? or Super Record?


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PostPosted: Sat Sep 07, 2013 12:34 am 
Old School Grand Master
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Lewisfoto

Out of my era (which is the 70's) but I would have guessed that SR would be the Strada Super Record from 1974 to the 80's..

http://velobase.com/ViewComponent.aspx? ... &AbsPos=47

Which would be ISO / Campag taper..

Shaun


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PostPosted: Sat Sep 07, 2013 12:41 am 
rBoTM Winner
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Shaun

That was my point exactly because folks use "SR" to refer to both the Campagnolo Super Record bits and the Sakae Ringko knowing which chainset he has will change the diagnosis completely.

Steven


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PostPosted: Sat Sep 07, 2013 10:51 am 
MacRetro rider
MacRetro rider

Joined: Tue Mar 29, 2011 6:06 pm
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Location: Roamin' in the gloamin'
Sorry for the confusion Midlife is right Super Record Strada.
So it is ISO then, but what axle length then?
The one I took out is 117 and still not long enough. Having a close look it seems like the drive side axle is shorter than the non drive. Could it be a pista bb?


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PostPosted: Sat Sep 07, 2013 11:40 am 
Old School Grand Master
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Location: Cumbria
Drive side should be longer than the non-drive side if the axle is assymetrical........are you looking at it the right way?

Normally Pista axles are the same length.

Something doesn't sound right.

Shaun


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PostPosted: Sat Sep 07, 2013 11:43 am 
Retro Guru
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I thought the BB length for a double chainring was 111mm


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PostPosted: Sat Sep 07, 2013 11:59 am 
Old School Grand Master
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were not BB's for italian bikes a little longer at 115mm because of the wider BB shell ??

Shaun


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