Joined: Feb 2012
Posts: 19,352
Likes: 5,469
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Agree with Jeff. The usual worst case is a slightly faster leak down over the days/weeks after inflating. It you ride with too low an air pressure the tire can creep/shift around the rim and the tubs valve being trapped by the rim hole will stay put and the tube will get stretched on one side and might bunch up on the valve's other side. But this happens due to too little pressure and not tube fit. So just keep the air pressure topped off before riding. Andy
BTW running a slightly undersized tube has been a BMX racing trick for many decades. Andy
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AndrewRStewart