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Vintage Cannondale issue

Old 08-09-20, 06:28 AM
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appleman
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Vintage Cannondale issue

I have an old 1987 Cannondale frame that I am trying to convert to a single speed. I used this bike in college and always had an issue with the wheel rubbing on the left chain stay. I am wondering whether something is bent or the wheel/hub setup needs some sort of spacer to push it to the right. I have put a few different wheels on and they all have the same issue.

Thanks
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Old 08-09-20, 07:06 AM
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If you've tried several, known true, properly dished wheels and they all land the same way, then it is most likely a frame issue. Is the wheel centered between the seat stays, or is it off-center there as well?

There's not a great deal you can do about the frame. If you have more clearance at the seat stays, you could re-dish the wheel to move the rim away from the chain stay.
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Old 08-09-20, 08:38 AM
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Yes, flip a known true properly dished wheel and review.
also know how the same wheel appears at the brake bridge.
under circumstances where you are measuring like this, take the tire off, much easier to observe stuff.

i would then assemble the frame and fork- ( with a known straight aligned fork and set a true dished confirmed front wheel in place without tire.

then you need a stiff 7’ long stiff straight edge.
working off the bottom side of the rear wheel as far up the arc to still clear the spokes- set that against the rim and see how it lines up with the front wheel- test both sides- that will tell the tale of the alignment between the wheels- this method has some missing possibilities but without a frame surface plate will get you far along. It will also suggest a possible correction.

cannondales are terrible candidates for the “string test” as it was widely known that during the heat treatment phase that the frame was held where it needed to be and the heat and stresses released would slightly distort the tubes. Sometimes really noticeable!
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Old 08-09-20, 09:45 AM
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Alignment issues aside, and after following the suggestions above, one known fix for this is to either add material (shim, JB Weld) or remove material from one of the dropouts (hand file).
Doesn’t take much addition or removal to resolve the centering issue.
While this will not resolve the alignment issue, it will put the wheel into proper spacing in the chainstays.
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Old 08-09-20, 10:16 AM
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Tighten your skewers.
Check that your clamping surfaces have not gone smooth.
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Old 08-09-20, 05:30 PM
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Originally Posted by Wildwood View Post
Tighten your skewers.
Check that your clamping surfaces have not gone smooth.
Pretty sure the OP's Cannondale would have vertical dropouts.
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Old 08-09-20, 07:55 PM
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So does my Pinarello, however a skewer with the clamping surfaces worn allowed a shift in the rear wheel enough for the tire to rub chainstay. Campa10 cassette.

I should learn to spin.
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Old 08-10-20, 12:12 AM
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Originally Posted by JohnDThompson View Post
Pretty sure the OP's Cannondale would have vertical dropouts.
Which makes it a lousy candidate for a single speed in the first place 😕
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Old 08-10-20, 06:23 AM
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Originally Posted by JohnDThompson View Post
Pretty sure the OP's Cannondale would have vertical dropouts.
Originally Posted by Lascauxcaveman View Post
Which makes it a lousy candidate for a single speed in the first place 😕
It would make it a lousy candidate for a fixed gear, but a single freewheel and chain tensioner ought to work fine.
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Old 08-10-20, 06:58 AM
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Thanks for all the feedback. From the look of things something has got to be out of alignment, have tried flipping the wheel and it is off center of the seat stay as well.
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Old 08-10-20, 05:50 PM
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Originally Posted by appleman View Post
From the look of things something has got to be out of alignment, have tried flipping the wheel and it is off center of the seat stay as well.
If it's offset at the seat stays in the same direction as the chain stays, you could re-dish the wheel to move the rim away from that side.
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Old 08-10-20, 11:50 PM
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Originally Posted by JohnDThompson View Post
It would make it a lousy candidate for a fixed gear, but a single freewheel and chain tensioner ought to work fine.
Meh. If I'm going to go to the bother of installing tensioner, I may as well just install a derailleur and get at least four more gears out of the deal.

I understand why people would want to tinker with such things, though: I've done it myself.
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