If you are unfortunate enough to be stuck with one of these bikes, you do have a serious problem. We carried tires in this size as long as we coud get them, but the supply has been exhausted.
This size is halfway between two fairly uncommon sizes, and you might be able to make do with a slightly wrong size tire.
Most of the bikes made for this orphaned size used cantilever brakes, so the possibility of making the bikes useful by replacing the wheels is even limited. The two sizes listed above will usually work with the original brakes, but these are both semi-obscure sizes, and rims are harder to find than tires. We do have some rims that could work.
- The next size up, 26 x 1 3/8 (590 mm) is 3 mm larger in diameter. A 590 tire will fit over the 587 rim, but is likely to fit too loosely to work at full pessure, if it even works at all.
- The next size down, 650 B (584 mm) is 3 mm smaller in diameter. It is likely to be a struggle to mount one of these on a 587 rim, but if you can get it on it will work, after a fashion. A mismatched tire may not seat properly, so there might be a bumpy ride with one section of the tire sinking farther into the rim than the rest.
The 584 mm/650B size seems to be undergoing a bit of a revival, so if you decide to replace the rims or wheels, this would likely be the best option.
584 / 650B Rims-Click Here
584 / 650B Tires-Click Here
I wish I could be more hopeful on this subject, but I'm afraid you have been left in the lurch by GT.
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