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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 05-04-10, 08:11 AM   #1
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Help - flat fix or new tubes

Howdy All,

Seems I flatted two tires riding fast over large gravel a few days ago.

I think I compressed the tire/tube so hard that the tubes were pinched between the rocks and the rims.

Tire 1 - cuts are 3/8 of an inch long, parallel to the rim channel and about 1/2 in apart

Tire 2 - cuts are pencil tip size, circular, parallel to the rim channel and about 1/2 in apart

These tubes I'm guessing are really inexspensive kenda/china so I'm wondering if its ok to use a larger patch to cover both punctures at once or just go ahead and get new tubes?

Assuming proper inflation would better tubes make for fewer flats, or should I look into heaver duty tires? ( Not really intending to repeat this mistake though. )

I also bent the rear rim enough so that the brake pads on one side rub slightly once around.

I think i could make the rim wall flat again with a pair of vice grips and something to protect the outer rim wall when I clamp down. I think neither rim has a wobble ( fortunately - I looked at wheelset prices and that would be half what i paid for the whole bike ).

So should I expect to be able to fix this rim myself or does it need to go into a shop where they would have better tools and could check trueness?

Any help appreciated.
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Old 05-04-10, 08:31 AM   #2
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A patch properly makes a good as new repair so there's rarely a reason not to patch, though at some point you have to buy new. Since your cuts are close together you're right to try to get both with a single patch.

The wheel repair can be done as you suggest, but you have to be careful no to damage the good side, or push the blip in too far. Since the wheel also needs aligning, I suggest that you remove the tires and bring one or both in for an alignment and to have the blip fixed. It shouldn't be prohibitive, and I doubt you need new wheels.

BTW- I think your real problem is that you were riding with not enough tire pressure, so I suggest that you're more careful about maintaining correct pressure for conditions in the future to avoid a repeat.
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