Mystery puncture
- Thread starter Andy in Germany
- Start date
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OP
OP
Andy in Germany
Guru
- Location
- Freiburg im Breisgau
Update...
The customer interested in the bike returned just as I started the third replacement; B*gg*r, now I was under pressure; unlike the tyre*.
New tube in tyre, after checking both tyre and rim for anything sharp and finding nothing; pump up; nothing. Put tyre on bike and start on front tyre.
Three minutes later rear inner tube explodes: there's a loud "pop" and dust comes out of the rim.
Tyre off, held carefully in the same position, checked, also in same position. 1 cm long split in inner tube, on the inside. check wheel. I can see exactly where it was because there's a mini explosion of dust. Nothing sharp or untoward.
Find new tyres from store, and new inner tubes, and dig up some fresh rim tape. Fit everything onto bike.
That was midday. As of 16:00 the tyre was still solid. we'll see what happens tomorrow. If it stays up I'll go with @Dogtrousers theory: the other tyres were haunted.
Oh, and the customer decided the bike was too big...
*Sorry...
The customer interested in the bike returned just as I started the third replacement; B*gg*r, now I was under pressure; unlike the tyre*.
New tube in tyre, after checking both tyre and rim for anything sharp and finding nothing; pump up; nothing. Put tyre on bike and start on front tyre.
Three minutes later rear inner tube explodes: there's a loud "pop" and dust comes out of the rim.
Tyre off, held carefully in the same position, checked, also in same position. 1 cm long split in inner tube, on the inside. check wheel. I can see exactly where it was because there's a mini explosion of dust. Nothing sharp or untoward.
Find new tyres from store, and new inner tubes, and dig up some fresh rim tape. Fit everything onto bike.
That was midday. As of 16:00 the tyre was still solid. we'll see what happens tomorrow. If it stays up I'll go with @Dogtrousers theory: the other tyres were haunted.
Oh, and the customer decided the bike was too big...
*Sorry...
Had such a problem once, the inner tyres were very slightly damaged but enough to leak to low pressure overnight.
As mentioned here, and which I suspected then because if it doesn't go away, it means the object doesn't wear so likely metal., it was a metal shard, invisible under the rubber, but since likely iron, I located it by attaching a thin wire to a small magne then slowly going over the suspected tyre surface and bingo. Had to cut it out, a triangular flake.
As mentioned here, and which I suspected then because if it doesn't go away, it means the object doesn't wear so likely metal., it was a metal shard, invisible under the rubber, but since likely iron, I located it by attaching a thin wire to a small magne then slowly going over the suspected tyre surface and bingo. Had to cut it out, a triangular flake.
OP
OP
Andy in Germany
Guru
- Location
- Freiburg im Breisgau
After changing everything the tyres held over the weekend and today I put the old tyres back on with fresh inner tubes. I did find a couple of metal shavings on the rim tape so maybe they were the problem before.
The tyres were pumped up to 4 bar so we'll see if they hold tomorrow.
The tyres were pumped up to 4 bar so we'll see if they hold tomorrow.
OP
OP
Andy in Germany
Guru
- Location
- Freiburg im Breisgau
Postscript to this: the punctures were caused by a dodgy batch of inner tubes. After having five in a row explode outside of the tyre we threw the box away...
ColinJ
Puzzle game procrastinator!
- Location
- Todmorden - Yorks/Lancs border
A friend had that once. He had bought a box of 10 and all of them failed along the seams.
OP
OP
Andy in Germany
Guru
- Location
- Freiburg im Breisgau
It was a tad more expensive for us: a box of 50, although I'm not sure how old they were as they were bought before I took over.
ColinJ
Puzzle game procrastinator!
- Location
- Todmorden - Yorks/Lancs border
I've just found a small split along a seam on the rear tube of my turbo trainer bike. That explains the mystery 'puncture'!
