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198? Schwinn Le Tour with bent chainring. advice appreciated

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198? Schwinn Le Tour with bent chainring. advice appreciated

Old 05-15-15, 06:20 PM
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Oncoming Storm
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198? Schwinn Le Tour with bent chainring. advice appreciated

The title tells you the source of my problem very simply I think, now I will expand. The big (52 tooth) ring has become so massively bent that the chain rubs and tries to climb onto the 52 when it's on the 40 tooth ring. Shifting is so adversely effected that if I move the lever all the way over to down-shift chain-rings too quickly (IE in under ten seconds ) it drops off and hits the frame. The LBS says it can't be bent back, I'm not surprised.

Obviously I have two options either get a new chaining or new crankset, and at the same time I would like to swap to a compact crank. (50-34) so that I won't always have to go all out on the steepest stuff just to keep from stalling. The bolt spacing on this crank is already 110 BCD on the inner so it would fit I would like to spend no more that $40 and would obviously like to come in under that if possible.

Could some kind people please point me in the right direction, on which they would do and link to some options?



(Edit, Strangely my spider uses both a 110mm inner and a 130mm outer bolt circle)

Last edited by Oncoming Storm; 05-15-15 at 07:04 PM. Reason: added new information
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Old 05-15-15, 08:32 PM
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Buy a 50 tooth 130 and a 34 110? May be easier to get a new crank that fits your bb. Keep in mind your rear derailer may not be able to take the chain slack of that big a jump, you may have to change it too, and possibly your shifters depending on how the bike is set up... Easier still is a new chainring and leave everything else alone. A cheap 52 tooth shouldn't cost more than $10. If you need more range there are wider range freewheels available, you'd need a chain as well. Can you provide information about your shifters and derailed, and your freewheel? (Number of cogs and range)
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Old 05-15-15, 09:42 PM
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CafeVelo

I will try and answer your questions in order, first I now think suspect it's a black 1984 Le Tour made by Giant (based on the serial number and location).

My shifters are the factory stem mounted friction shifters (yeah baby), as for derailers They just say "Schwinn approved" and while the description in the catalog says Suntour ARX GT's the rear derailer doesn't look like anything like an ARX GT,. The adjustment screws on my rear derailer are in weird places, one is on the rear and the other is on the bottom on it it will shift 30 teeth from experience on the small ring (I borrowed mom's 14-34 5 speed one day to test) but spring tension won't let it use the even the 27 on the big ring. I'm currently running a 6 speed freewheel with 14-27 gearing on the back as well.
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Old 05-15-15, 10:06 PM
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I don't get it... why not just replace the bent chainring? If you want to upgrade parts then the question is irrelevant.
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Old 05-15-15, 10:59 PM
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Corrado33 The original question to rephrase was since the big ring is damaged and I also want some lower gears, would you swap both chainrings to make it a compact or try and find a compact crankset that could be fitted to the bike.

Does that help
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Old 05-16-15, 07:14 AM
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Personally, I'd just replace chainrings. It's less expensive than a new crankset and you won't have to worry about figuring out parts compatibility or fit issues. (Bottom bracket type/length, number of speeds the crankset is designed for, etc.) You can pick up Sugino chainrings for roughly $20-30 each from benscycle.com, with free shipping if it's your first order from them.
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Old 05-16-15, 07:43 AM
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Third option. Straightening Chainwheels
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Old 05-16-15, 11:02 AM
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To complicate things I just measured the outer chainring again just to be extra sure... Anyone know where to find a 187bdc chainring?

Thanks Sugino, why would you want to use a standard bolt pattern ?

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Old 05-16-15, 04:13 PM
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Originally Posted by bhchdh View Post
That would be my first option.
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Old 05-16-15, 08:10 PM
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Originally Posted by Oncoming Storm View Post
To complicate things I just measured the outer chainring again just to be extra sure... Anyone know where to find a 187bdc chainring?

Thanks Sugino, why would you want to use a standard bolt pattern ?

A picture would help. Sugino has always used "standard" bolt pattern chainrings. A 1980's Schwinn Le Tour is almost certainly equipped with 110BCD rings. A crank with both 110 and 130BCD rings just doesn't exist (the bolts would run into each other).

I think you might be measuring the bolts that hold the chainring guard on. Does it look like this Sugino Silstar?

VeloBase.com - Component: Sugino No. 5 / Silstar

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Old 05-17-15, 06:58 AM
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Thanks Jeff, somehow I failed to catch that when I measured it on my bike. So that's just a chainguard, is it very common to bolt the chainguard through the chainring as on both mine and the sugino silstar crankset you linked too?
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Old 05-17-15, 08:08 AM
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Originally Posted by Oncoming Storm View Post
Thanks Jeff, somehow I failed to catch that when I measured it on my bike. So that's just a chainguard, is it very common to bolt the chainguard through the chainring as on both mine and the sugino silstar crankset you linked too?
It was common on fair-to-medium quality cranksets of that era. (I was a Schwinn mechanic in 1979 through 1984.) I'd still like to see a picture of your crank or the whole bike. It would help to determine exactly which crank you have. Some cranks have the large chainring swedged to the crankarm- that is, they aren't replaceable. Straightening is your only option.
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