Join Date: Sep 2000
Location: Spokane WA
Bikes: Seven Axiom Ti, Trek 620, Masi cylocross (steel). Masi Souleville 8spd, Fat Chance Mtn. (steel), Schwinn Triple Bar cruiser, Mazi Speciale Fix/single, Schwinn Typhoon
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Hmm, Interesting THEORY about a 25mm tube getting blown up enough in a 35 mm tire, (10mm difference), to make it so thin it's going to rupture. I've never seen it proven in nearly 30 years of riding and racing, including over eight years working in some VERY respected shops. It's also interesting that mechanics who've provided neutral support in several Olympic Trials or who've been assigned to work the "Giro" for their team have actually recommend using a smaller tube than tire to save weight, to make installation quicker and easier and less likely to have seating problems because of the reduced bulk to deal with.
I've used smaller tubes in my tires for DECADES with only POSITIVE results, imagine that!!! (I've used same sized tubes as well and PREFER to use the "skinny ones"). Of course there are limits, but, ( I believe), they're a bit more than 10 mm.
A tire "blowing off" of a rim is almost always the result of poor seating, usually when an edge of the tube is caught under the rim or when the rim isn't seated evenly around the rim. Also the "hook bead" problem mentioned above is definitly a cause as well.
I guess we all have different experiences and opinions and need to check the credibilty of our sources of infomation- I KNOW I'm not omniscient.
Ride with an open mind
Last edited by pat5319; 06-16-02 at 02:42 AM.