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Chain suddenly rubbing rear tire

tires too, low pressure will cause the tire to go flat, but only on the bottom. To big of a tire size sounds like the culprit. also never trust the chain adjustment marks, especially on an older bike, always eyeball it real good, us a tape measure if you;re not comfortable eyeballing it. By the way is that a studded leather belt holding your exhaust on, must smell like roasting hide when it gets warmed up.
 
Can someone with a GS450L do the following?

> Measure the closest separation between the tire and the chain.
> Measure the distance between the tire and each side of the swing arm.

This should be done with the tire fully inflated and the bike on the centerstand, for reference purposes. (Do GS450Ls have center stands?)

It seems to me that going one tire size wider should not be enough to make the tire interfere with the chain to this extent.

SamOOOlee: It seems to me quite possible that the previous owner had the rear tire replaced, but that the wheel was not correctly installed in the motorcycle. Several spacers and washers are involved. To get an idea of what is in there, go to Alpha Sports, and look up the parts fiche (exploded diagram of every part) for 1981 GS450L. Lots of washers and spacers.

Possible errors:
Switching parts between left and right side of wheel
Omitting a washer on one side.
Losing a washer or spacer and substituting an incorrect part.

It is also possible that the swing arm has been damaged.
 
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