Well here we are again.
Last Sunday, 2 ‘punctures’ one in the rear at the start of the ride and one in the front part way through the ride.
Both sealed for a short while and then just opened up again. This happened 6 or so times. When I got back the bike, oh and me, was covered in drying latex solution.
How to wash it off…..sponge down so you can see it and then wipe off with Isopropyl alcohol, then coat the bike with silicone spray again to help prevent things ‘sticking’.
Having emptied out the Stans and stripped the tyres off, and following thorough cleaning and drying, I found that these were not punctures but a tyre failure. These ‘holes’ in the tyre are always in the centre. The positioning of these and previously repaired ‘holes’ follow the same pattern.
(I ran all winter over the same ground with tubed Maxiss tyres without 1 puncture).
This is what the defect looks like:
Plenty of tread:
Closer look, defect here:
So, lessons learnt:
Dont use cheap patches.
This looks like its OK:
Closer look, it has not stretched, the air is getting under the edge, and the Stans will eventually work its way out:
Use these patches :
Tip Top with a feather edge.
Reassembled again. Struggled with the tyre inflator on my workshop compressor. At 45psi the beads seated with a satisfying ‘click’.
I’m going to run these st 35psi, so pressurised at 1.1xWP = 40psi, for 30minutes. (sounds like a hydro test of some pressure retaining industrial equipment !)
Depressurised, removed the valve core, and filled with 60ml new, freshly shaken and stirred Stans through the re valve stem. (No need to disturb the tyre again)
Going to buy an Airshot, or make a copy from an old fire extinguisher body.