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General Minitrail Talk
Modifications
Replacement tires for OEM 4.00 x 10 Trailwings
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<blockquote data-quote="69ST" data-source="post: 71569" data-attributes="member: 5"><p>If you've been following the tire size discussion across multiple threads, then you've seen the term "nominal size" (what's shown on the sidewall). It can and does vary significantly from reality. Your metric size conversions and observations about what's available are reasonably accurate. Still, the only way to be sure of getting the size you want is to measure the circumference; there's no substitute and that's part of what makes your project difficult. Seemingly small differences in nominal tire size can have surprisingly large effects in reality, so your attention to detail is well worth the effort. OLD CT gave you some good advice, the Continental Zippy's have been popular with the small bike crowd, across the pond, for years.</p><p></p><p>Speedometer accuracy varies from one unit to the next. The only surprise is that these 40 year-old mechanical gauges work as well as most of them do. A tire size that gives one rider an accurate reading might be way off for someone else. The stock speedometer is calibrated for a tire with a 56.25" circumference, very close to the actual size of a typical Trailwing (They have ranged from just shy of 57", new, down to just over 54" worn). EU riders who run 3.50s almost always complain about overly optimistic indicated speed. 120/90 x 10 tires that I've actually measured have ranged from 59.5" to just over 61"; that's enough to affect speedo readings and overall gearing (revs per mile) by as much as 14%, even more compared to a 3.50 x 10 (or equivalent). Don't be surprised if you have to change one, or both, sprockets to restore gearing. That's also the limit of what will fit on a CT with stock rims; the tires will be crowned a little (pinched on the rim) and you'll lose chain adjustment range. </p><p></p><p>120 section width is the limit for stock width rims and standard sprockets, also the widest that will fit the front. Ideally, a 120-section tire would be mounted on a 3.50" wide rim. 130 section width is the limit for the rear, with a standard swingarm, and it's tight. 3.50" is the minimum wheel width, 4.0" ideal. You'll also have to run offset sprockets if you want the chain to clear the tire sidewall and the wheel centered.</p></blockquote><p></p>
[QUOTE="69ST, post: 71569, member: 5"] If you've been following the tire size discussion across multiple threads, then you've seen the term "nominal size" (what's shown on the sidewall). It can and does vary significantly from reality. Your metric size conversions and observations about what's available are reasonably accurate. Still, the only way to be sure of getting the size you want is to measure the circumference; there's no substitute and that's part of what makes your project difficult. Seemingly small differences in nominal tire size can have surprisingly large effects in reality, so your attention to detail is well worth the effort. OLD CT gave you some good advice, the Continental Zippy's have been popular with the small bike crowd, across the pond, for years. Speedometer accuracy varies from one unit to the next. The only surprise is that these 40 year-old mechanical gauges work as well as most of them do. A tire size that gives one rider an accurate reading might be way off for someone else. The stock speedometer is calibrated for a tire with a 56.25" circumference, very close to the actual size of a typical Trailwing (They have ranged from just shy of 57", new, down to just over 54" worn). EU riders who run 3.50s almost always complain about overly optimistic indicated speed. 120/90 x 10 tires that I've actually measured have ranged from 59.5" to just over 61"; that's enough to affect speedo readings and overall gearing (revs per mile) by as much as 14%, even more compared to a 3.50 x 10 (or equivalent). Don't be surprised if you have to change one, or both, sprockets to restore gearing. That's also the limit of what will fit on a CT with stock rims; the tires will be crowned a little (pinched on the rim) and you'll lose chain adjustment range. 120 section width is the limit for stock width rims and standard sprockets, also the widest that will fit the front. Ideally, a 120-section tire would be mounted on a 3.50" wide rim. 130 section width is the limit for the rear, with a standard swingarm, and it's tight. 3.50" is the minimum wheel width, 4.0" ideal. You'll also have to run offset sprockets if you want the chain to clear the tire sidewall and the wheel centered. [/QUOTE]
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Replacement tires for OEM 4.00 x 10 Trailwings
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