Do CR500's delaminate?

[Gridgway]

Been doing some polishing today (after having used the 7 every day last week shock horror) and I had the wheels off to clean them. I noticed a lateral mark across the tread of one CR500 that looks suspiciously like a seam. It is very noticeable on one tyre, there if you look hard on two more and seemingly not on the forth.

 

You might be able to see it ... here

 

Graham

 

 

Edited by - gridgway on 9 Sep 2007 20:57:26

[CharlesElliott]

Yes, they do. And on race cars Avon recommend running them 'backwards' to help prevent it under braking.

 

Charles

---

My SuperGraduates 2006 diary

My SuperGraduates 2005 diary, My Caterham Academy 2004 build and race diary

[Gridgway]

I should add that those tyres have done very little track work and are fitted according to the product code method from Avon.

 

Are they safe to use?

 

Graham

[Tom_C]

Rob Grigsby has had 2 blow outs, I think a couple of others have had problems too. If it were me I wouldn't drive on those.

 

 

BTW please give generously to Bundle's Big Charity Walk for Asthma research here Ta.

 

Cheers

 

Tom

 

FH54WLX

 

see here - UPDATED again

[neilg]

Cr500's only delaminate under arduous dry track work when running the right way round. If you have a problem, take em back to Caterham or Avon.

I have given them a serious pasting over the last year way past the wear blocks with no problem . Any suggestion that these tyres are dangerous is ballcocks. In my opinion .

[Peter T]

That is the oppsite way that mine de-laminated.

Looks like a problem of the construction to me?

 

 

[Ian B]

Robs thread is here. My set show cracks around the inner sidewall only, both in the wall and along the length of the recessed 'printed' area ☹️

 

The cause seems to be heat build up on the inner sidewall, which gets considerably hotter than the outer (hope to measure the difference soon).

 

This is not with track use.

 

 

Ian - MI 5EVN - Slightly Vider SVelte model 😬 now repainted to match the Autocom headsets 😳

[RichardUSA]

I have CR500's that I use on the road (currently 5,200 miles. If this is a known problem by Avon or CC it is very disturbing. This is at the very least able to damage the car, at the worst...........

Ours are expensive cars with tires sold for road use (as well as track) so they should be able to deal with the forces imposed by a 1,300 lb car. I will inspect again, but I don't pay good money to worry that I am putting me or my family at risk.

[Stationary M25 Traveller]

You might be able to see it ... here

 

That looks horrible !!!

 

******************

And you run and you run to catch up with the sun, but it's sinking...

 

And racing around to come up behind you again. new link to photos

[Gridgway]

What I have got on my tyres is across the tread, not cracks in the sidewall. No idea if it's actually a problem, but will be checking with Avon to get their view.

Graham

[shn7]

I had one that was a lot more obvious than your Graham. It hadn't been used on track but was down the the wear bars.

 

Took pictures and emailed them to Avon. Never even got a reply ☹️.

 

Steve.

Sussex (West) AO

Not forgetting Percy the Polar Bear

[Stuart Faulds]

Graham - what you are seeing is very common with these tyres. It regularly happens early in the life of the tyre and gets no worse. It also has no negative impact on the performance of the tyre or safety (in my experience of getting through a few hundred of them, and also having discussed them with Avon when the tyre was first introduced and we first observed this phenomenon).

 

Not that I expect the panic merchants to believe me of course.

[Jason Plato]

it happens to that degree on the ACB's too.

 

Taffia rear gunner

 

[Billyboy]

 

Not a panic merchant but a tyre fitter , seller and specialist for a long time.

 

If these were on my R300 I WOULD NOT FEEL TO HAPPY AT 70 ON THE M6 AT ALL.

 

I would write a letter to avon include hard copy photos and declare milage and use and register the letter add in the letter a failure to reply will infact indicate to you they are SAFE to use on the public highway.

 

 

Then see if they respond........

[Gridgway]

Spoken to Avon technical and it is a common phenomenon which has no adverse effect on safety provided the (rear) tyres are on the right way round. And to quote...

 

"from the back the V of the tread should point upwards". The fit of the fronts doesn't matter from a "delaminating" perspective.

 

Graham

 

 

[SLR No.77]

So if a car went for an MOT with such a tyre would it pass 🤔

 

Stu.

 

www.superse7ens.co.uk..........the rebuild 😬

 

 

[Rob Walker]

Well I won`t be buying any of those.

[Slipper man]

Nor will I. But only because of the cost. I find 48R's better and half the price. I had delamination on a rear slick. That is how I found out that there is a right and wrong way round for them!

[moosetestbestanden]

I had delamination on a rear slick. That is how I found out that there is a right and wrong way round for them!

 

So which way did you have them on the car? Everything I've read says mount Avon ACB10s and bias ply slicks w/ numbers facing right at the rear and left at the front. I've also read that it just doesn't matter (for handling). So now it does?

 

P.S.: On track, it's slippers for me 😬

 

-------

Chris

Ad majorem 7 gloriam

[SLR No.77]

here

 

Stu.

 

www.superse7ens.co.uk..........the rebuild 😬

 

 

[rgrigsby]

FWIW prior to the problems I've had with sidewall blow outs I've used CR500's for 4 years and covered 1000's of miles on the road and wet track days and never had any problems.

 

I don't use them on dry track days though.... as an aside that's nothing compared to the delamination on my Kumho's 😳

 

Rob G

www.SpeedySeven.com

[Slipper man]

The handling was absolutley fine with the slicks, but i had them on the wrong wheels. Still can't remember the right way, but am using 48R's at the moment, which are not as grippy, but at least it saves me the worry!