What might have caused this wear?

[Cal44]

Was out on a 36 mile ride today on the Isle of Arran. Was a great day for it until on a smooth fast stretch of road I noticed a strange feeling in the rear. Stopped when safe and legal etc and noticed there was a bubble that was pushing both side walls and tread wise if you get my meaning. Cue me now riding no faster than 10mph with around 20 miles back to the ferry for fear of it going pop and me in the ditch or worse!

The tyres have always been kept up to sidewall max pressure of 85 psi and the tyres are 35mm wide 700c.

Any one know what would have caused the wear on the inside that caused this??

One pick taken with flash the other without to try and give the best idea possible of the interior of the tyre.

Thanks!

 

[S-Express]

85psi is a lot of pressure for a 35mm tyre - must be like riding on cartwheels.

 

[Tigerbiten]

The only time I've blown a tyre like that was when running a cheap tyre at max pressure and hitting a cattle grid at +40 mph on the run down to the Iceland-Denmark ferry.
The shock of hitting the sharp edge of the grid damaged the ply inside without damaging the tread outside, causing a bulge.
I got the third back tyre of that years tour soon after getting off the ferry.

You may have done something similar with a pot hole at some point.

 

[steve50]

Has the bike ever been kerbed, ie; bounced up a kerb, I notice there is also some damage to the tyre bead.

 

[tyred]

I would agree with some sort of impact damage.

You shouldn't need to pump a 35mm tyre up to those sort of pressures either unless you are carrying seriously heavy loads. About 50 would be fine.

 

[Joffey]

I'm heavier than you and run 25mm only pumped up to 95psi...

 

[Cal44]

I've been running these tyres at that kind of pressure for a few years now....maybe that has something to do with it?? I'll keep the next set a little lower this time and see how I go with them. Just for interest the tyres have done around 1700 miles so i think I have received a good return for my money!

The impact theory makes sense as the roads I ride on in general are quite poor and lots of climbing followed by as quick a descent as I can handle on some rough patches with a few holes here and there.

The wheel hasn't been kerbed as I usually take quite a bit of care if bumping up on to a pavement for any reason and this is not often.

 

[Ajax Bay]

Tyre pressure guide attached. More comfort; more grip; higher rolling resistance, but not much. You are running far too much pressure in those tyres, unless you're 22 stone.
Getting only 1700 miles is pretty poor if cycling on roads, btw. I'd expect 3000+ miles on the rear (28-622).
Example: Rider and bike weight: 100kg. Weight distribution (front/rear): 45%/55%. Wheel loads: 45kg/55kg (ie for a 88kg rider, say).
Pressures for 35mm tyres: 50psi/60psi.

 

[Cal44]

I weigh just under 13 Stone...so approx 82Kg...other than this bubble that has appeared yesterday the tyres were in pretty good condition and I would have continued to ride on them both with no issue for quite a while longer. I'm going to keep running the front and see how long it lasts albeit with a little less air in it now!

 

[Nibor]

I run my 35mm tyres at 85psi...........but I am 21 stone lol