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FJR Rides and Gatherings
Ride Planning & Regional Information Exchange
HELP! Bent rim and possibly assistance required in PNW
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<blockquote data-quote="ionbeam" data-source="post: 1176917" data-attributes="member: 277"><p>Guess this makes the inner tube thingie moot.</p><p></p><p>There is a fair chance that the tube's air stem will be too big for the hole in the cast rim. A general rule of thumb is to derate the speed rating of the tire at least one level due to heat. Heat rise and friction are two of the big concerns followed by pinching the tube when installing the tire. Cast rims typically have a deep center rib which the tube doesn't do well with. The tube must not be bigger than the tire. The tube may chafe the soft inner lining of the tubless tire. If there is no appreciable air leaking past the bend in the rim there can be trapped air pockets.</p><p></p><p>They do make tubes for tubelss tires but they are a real hard find.</p><p></p><p>In an emergency, use a tube, slow down, don't push things and be aware if the tube doesn't survive the experience you will have an instant blow-out instead of a slow leak-down.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 1176917, member: 277"] Guess this makes the inner tube thingie moot. There is a fair chance that the tube's air stem will be too big for the hole in the cast rim. A general rule of thumb is to derate the speed rating of the tire at least one level due to heat. Heat rise and friction are two of the big concerns followed by pinching the tube when installing the tire. Cast rims typically have a deep center rib which the tube doesn't do well with. The tube must not be bigger than the tire. The tube may chafe the soft inner lining of the tubless tire. If there is no appreciable air leaking past the bend in the rim there can be trapped air pockets. They do make tubes for tubelss tires but they are a real hard find. In an emergency, use a tube, slow down, don't push things and be aware if the tube doesn't survive the experience you will have an instant blow-out instead of a slow leak-down. [/QUOTE]
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FJR Rides and Gatherings
Ride Planning & Regional Information Exchange
HELP! Bent rim and possibly assistance required in PNW
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