shredded tyres - the last straw!

Post by **Digger** » Sat Feb 05, 2011 7:24 pm

Those with 275/30 please mention if you have added spacers and what size. Ta.

We also dont know if any of those affected had tip-top suspension or more tired with some lower arms and-or bearing play as suggested above iirc by grizz/doug.

Falken 275/30/19's waiting in the wings

Post by **bam_bam** » Sat Feb 05, 2011 7:26 pm

1. GOOD FIT : Michelin PS2 R01 255/35/19 - Shoppinit
2. KNOBBLED: Michelin PS2 255/35/19 - Shoppinit
3. KNOBBLED: VRED Ultrasessenta 255/35/19 - SuicideAl
4. GOOD FIT : Vred Ultrac Sessanta 275/30/19 Daveperc (and others)
5. GOOD FIT : Vred Ultrac Sessanta 255/35/19 bam_bam and Bilko (knobbly bit removed just incase)
6. GOOD FIT : Good Year F1 Asymmetric 275/30/19 bam_bam
7. KNOBBLED: Michelin PS3 255/35/19 - Shoppinit
8. GOOD FIT : Vred Ultrac Sessanta 255/35/19 PhilRoach (h&r's)
9. GOOD FIT : Vred Ultrac Sessanta 255/35/19 Bilko (knobbly bit removed just incase)

Post by **Daveperc** » Sat Feb 05, 2011 7:49 pm

I don't think the type of suspension, or the state of it should make any difference. The geometry between "Ol Knobbly" and the centre of the wheel is fixed. Admittedly wheel bearing play would in theory make a difference, but there would need to be a lot of play (ie a completely knackered bearing) for it to move that much.

Looks to me more likely is a tyre pressure issue on the Vred's - I keep mine at 38 and they have been fine - but lower pressure and vigourous cornering would cause intermittent fouling which would wear it away gradually without being that obvious.

Dave

Post by **Shoppinit** » Sat Feb 05, 2011 7:58 pm

I agree with everything that Dave said. Sounds like those on vreds need to be especially careful to keep their pressures correct.

Post by **Gravitypilot** » Sat Feb 05, 2011 8:04 pm

1. GOOD FIT : Michelin PS2 R01 255/35/19 - Shoppinit
2. KNOBBLED: Michelin PS2 255/35/19 - Shoppinit
3. KNOBBLED: VRED Ultrasessenta 255/35/19 - SuicideAl
4. GOOD FIT : Vred Ultrac Sessanta 275/30/19 Daveperc (and others)
5. GOOD FIT : Vred Ultrac Sessanta 255/35/19 bam_bam and Bilko (knobbly bit removed just incase)
6. GOOD FIT : Good Year F1 Asymmetric 275/30/19 bam_bam
7. KNOBBLED: Michelin PS3 255/35/19 - Shoppinit
8. GOOD FIT : Vred Ultrac Sessanta 255/35/19 PhilRoach (h&r's)
9. GOOD FIT : Vred Ultrac Sessanta 255/35/19 Bilko (knobbly bit removed just incase)
10. GOOD FIT : Vred Ultrac warpdrive 275/30/19 gravity

Post by **480bhp** » Sat Feb 05, 2011 8:46 pm

A buckled wheel could cause the tyre to rub only in a 6" area.

Never really checked mine, but i know it's running bridgestones and the clearance isn't huge, when i get the wheels refurb'd i'm sure i'll have good look at the tyres then.

Post by **Digger** » Sat Feb 05, 2011 9:45 pm

1. GOOD FIT : Michelin PS2 R01 255/35/19 - Shoppinit
2. KNOBBLED: Michelin PS2 255/35/19 - Shoppinit
3. KNOBBLED: VRED Ultrasessenta 255/35/19 - SuicideAl
4. GOOD FIT : Vred Ultrac Sessanta 275/30/19 Daveperc (and others)
5. GOOD FIT : Vred Ultrac Sessanta 255/35/19 bam_bam and Bilko (knobbly bit removed just incase)
6. GOOD FIT : Good Year F1 Asymmetric 275/30/19 bam_bam
7. KNOBBLED: Michelin PS3 255/35/19 - Shoppinit
8. GOOD FIT : Vred Ultrac Sessanta 255/35/19 PhilRoach (h&r's)
9. GOOD FIT : Vred Ultrac Sessanta 255/35/19 Bilko (knobbly bit removed just incase)
10. GOOD FIT : Vred Ultrac warpdrive 275/30/19 gravity
11. GOOD FIT: ContiSportContact 3 255/35/19 42PSI - Digger, a good fit afaik, need replacing soon

Post by **Digger** » Sat Feb 05, 2011 9:49 pm

480bhp wrote:A buckled wheel could cause the tyre to rub only in a 6" area.

Never really checked mine, but i know it's running bridgestones and the clearance isn't huge, when i get the wheels refurb'd i'm sure i'll have good look at the tyres then.

Your call of course but personally I wouldn't leave it to chance.

Post by **Cornishmoocher** » Sat Feb 05, 2011 11:16 pm

HMMMMmmm........................

Post by **monoi** » Sun Feb 06, 2011 2:58 pm

1. GOOD FIT : Michelin PS2 R01 255/35/19 - Shoppinit
2. KNOBBLED: Michelin PS2 255/35/19 - Shoppinit
3. KNOBBLED: VRED Ultrasessenta 255/35/19 - SuicideAl
4. GOOD FIT : Vred Ultrac Sessanta 275/30/19 Daveperc (and others)
5. GOOD FIT : Vred Ultrac Sessanta 255/35/19 bam_bam and Bilko (knobbly bit removed just incase)
6. GOOD FIT : Good Year F1 Asymmetric 275/30/19 bam_bam
7. KNOBBLED: Michelin PS3 255/35/19 - Shoppinit
8. GOOD FIT : Vred Ultrac Sessanta 255/35/19 PhilRoach (h&r's)
9. GOOD FIT : Vred Ultrac Sessanta 255/35/19 Bilko (knobbly bit removed just incase)
10. GOOD FIT : Vred Ultrac warpdrive 275/30/19 gravity
11. GOOD FIT: ContiSportContact 3 255/35/19 42PSI - Digger, a good fit afaik, need replacing soon
12. GOOD FIT: Cooper Xeon 255-35 19. Monoi

Post by **monoi** » Sun Feb 06, 2011 3:01 pm

The weird thing is that you did not smell rubber burning after driving the car, as I would have thought it would stink to high heaven.

Not only that, but low pressure would deform the tyre when it is in contact with the road, not sure why the tyre would deform at the top. Unless the centrifugal force deforms the tyre upwards?

How long did it take between fitting the tyre and having it blow up?

Post by **Daveperc** » Sun Feb 06, 2011 7:23 pm

Low pressure reduces the overall lateral stiffness of the tyre, so the whole tyre deflects sideways under lateral load - ie when cornering.

I have only had one tyre rub on old knobbly - a Dunlop, but as I can't recall the details I haven't put it in above. I got it as the it was the only tyre a local tyre agent (in deepenst South Wlaes) had when I cut the wall on a PS2 on a rough track. It was immediately obvious when fitting that it was rubbing, and the wheel could not be rotated by hand. Simple solution was to put the errant tyre on the rear.

This experience is one reason why I suspect low tyre pressures - if it is rubbing all the time then it's obvious (and audible). If it's not rubbing all the time then it must be deflecting under lateral load for some reason.

Dave

Post by **Fingers01** » Sun Feb 06, 2011 9:12 pm

Daveperc wrote:Low pressure reduces the overall lateral stiffness of the tyre, so the whole tyre deflects sideways under lateral load - ie when cornering.

Dave

i have to agree with Dave regarding low pressures and side wall stiffness under laterall load but be aware that the TPMS, if it's working properly only flags up a drop in pressure of 0.2 Bar or more this is only 3.00psi and just a drop more in PSI and it is all over.

I am running 255 Vreds, and a while back, TPMS came on, turned a corner and i was almost running on the rim. Took the wheel off - i then saw the cut in the tyre and blamed the so called knobbly bit - but it was a puncture first - then the tyre deformed -side wall then cut on the knobbly bit.

i learnt at the cost of £170.00. To manually check my tyre pressure twice a week - 40psi all round- resetting TPMS if required and so far fingers crossed no further issues.

Mark M

Post by **Mancmatt** » Mon Feb 07, 2011 2:51 am

OK. So I've put on 2 new Vreds + ground off ol Knobbly. Took some photos along the way.

Post by **Mancmatt** » Mon Feb 07, 2011 2:53 am

And the other side

RS246.com Forum :: The World's #1 Audi R, S and RS Enthusiast Community

shredded tyres - the last straw!

Who is online