Last night while out for a ride I noticed a regular bump bump bump as I was riding along. I assumed that the wheel had gone out a true as I'd been tinkering with it last weekend, although it had been perfect until yesterday.
I've had a good look at it today and the wheel itself is truer than it's ever been (it moves vertically by about 1mm at most and a bit less from side to side) but there is a distinct flat spot in the tyre. To confirm, I turned the tyre 90 degrees and the flat spot was 90 degrees away from where I'd marked the previous flat spot on the rim. The tyre has a mould mark which is roughly 5mm from the edge and is constant all the way round, but when on the wheel it disappears under the rim at the flat spot.
The tyre is only a few weeks old, has only done 100 miles or so and the last pair of the same type lasted about 2 years with no problems. Have I bought a duff one? They came from Wiggle (as a pair, on special offer) - are Wiggle any good for accepting returns? I'm not too keen on having to post 2 bike tyres back to them.
"naked_draughtsman" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Last night while out for a ride I noticed a regular bump bump bump as I was riding along. I assumed that the wheel had gone out a true as I'd been tinkering with it last weekend, although it had been perfect until yesterday.
I've had a good look at it today and the wheel itself is truer than it's ever been (it moves vertically by about 1mm at most and a bit less from side to side) but there is a distinct flat spot in the tyre. To confirm, I turned the tyre 90 degrees and the flat spot was 90 degrees away from where I'd marked the previous flat spot on the rim. The tyre has a mould mark which is roughly 5mm from the edge and is constant all the way round, but when on the wheel it disappears under the rim at the flat spot.
The tyre is only a few weeks old, has only done 100 miles or so and the last pair of the same type lasted about 2 years with no problems. Have I bought a duff one? They came from Wiggle (as a pair, on special offer) - are Wiggle any good for accepting returns? I'm not too keen on having to post 2 bike tyres back to them.
Last night while out for a ride I noticed a regular bump bump bump as I was riding along. I assumed that the wheel had gone out a true as I'd been tinkering with it last weekend, although it had been perfect until yesterday.
I've had a good look at it today and the wheel itself is truer than it's ever been (it moves vertically by about 1mm at most and a bit less from side to side) but there is a distinct flat spot in the tyre. To confirm, I turned the tyre 90 degrees and the flat spot was 90 degrees away from where I'd marked the previous flat spot on the rim. The tyre has a mould mark which is roughly 5mm from the edge and is constant all the way round, but when on the wheel it disappears under the rim at the flat spot. The tyre is only a few weeks old, has only done 100 miles or so and the last pair of the same type lasted about 2 years with no problems. Have I bought a duff one?
Maybe.
Quoted message said:
They came from Wiggle (as a pair, on special offer) - are Wiggle any good for accepting returns? I'm not too keen on having to post 2 bike tyres back to them.
This problem, in my experience, is usually caused by uneven seating and usually solved by refitting the tyre. It can take several attempts. Try over-inflating* (then letting down to usual pressure). I reckon this helps push the tyre out.
Lube or talc is going to be suggested - but it's never worked for me.
* by as much as you dare, bearing in mind that rims can fail, or tyres can pop off, if you go too far.
I've had a good look at it today and the wheel itself is truer than it's ever been (it moves vertically by about 1mm at most and a bit less from side to side) but there is a distinct flat spot in the tyre. To confirm, I turned the tyre 90 degrees and the flat spot was 90 degrees away from where I'd marked the previous flat spot on the rim. The tyre has a mould mark which is roughly 5mm from the edge and is constant all the way round, but when on the wheel it disappears under the rim at the flat spot.
Either (a) it isn't seated properly or (b) is working its way to a premature *Bang*. I speak from experience...
Deflate, reseat and reinflate, and if it's still there it's probably (b) above.
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The tyre is only a few weeks old, has only done 100 miles or so and the last pair of the same type lasted about 2 years with no problems. Have I bought a duff one?
If it's not (a) then there's a good chance, I'd think. It does happen (I speak from experience, got a free replacement)
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Wiggle any good for accepting returns?
There I can't help you...
Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net [email hidden] http://www.dundee.ac.uk/~pjclinch/
In article <[email hidden]>, naked_draughtsman [email hidden] says...
Quoted message said:
Last night while out for a ride I noticed a regular bump bump bump as I was riding along. I assumed that the wheel had gone out a true as I'd been tinkering with it last weekend, although it had been perfect until yesterday.
I've had a good look at it today and the wheel itself is truer than it's ever been (it moves vertically by about 1mm at most and a bit less from side to side) but there is a distinct flat spot in the tyre. To confirm, I turned the tyre 90 degrees and the flat spot was 90 degrees away from where I'd marked the previous flat spot on the rim. The tyre has a mould mark which is roughly 5mm from the edge and is constant all the way round, but when on the wheel it disappears under the rim at the flat spot.
Check that the bead isn't kinked on either side of the flat spot, possibly where you used tyre levers before. If it is then remove the kinks as best you can with your thumbs. Lubricate the bead with washing-up liquid, refit the tyre and pump it up as hard as you dare, checking occasionally that it's not going to blow off the rim (it's a good idea to use eye and ear protection when doing this). Hopefully it will pop back into place and you can then reduce the pressure to normal.
"Rob Morley" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Lubricate the bead with washing-up liquid, refit the tyre and pump it up as hard as you dare, checking occasionally that it's not going to blow off the rim (it's a good idea to use eye and ear protection when doing this). Hopefully it will pop back into place and you can then reduce the pressure to normal.
Thanks for all your suggestions. I tried tried rubbing a few drops of washing up liquid along the bead in the dodgy bit, pumped up to 80 psi but didn't work, but possibly because the inner tube kept getting caught under the tyre near the valve and popping the tyre off.
Spun tyre round so the tdodgy bit was over the valve and made sure the tube was in properly, poured washing up liquid along the bead and gave it a bit of a rub in. Pumped back up to 80 psi and it was fixed. The tyres say "max 100 psi" but don't give a minimum so I'll leave them at 80 psi for now and will remember what to do next time it happens!
