Front/Rear tread difference

Post by **rcm63** » Sun Dec 09, 2012 11:00 am

I'm on just over 9000 miles and my front tyres will soon need replacing by the look of them.
My rears have loads of tread left.
What's the maximum tread difference front/rear to not mess up the haldex system?
When I had my TT quattro I could at least rotate the tyres to even out the wear.

The tyre people on my last TT tyre purchase suggested no more than a couple of mm's difference front/rear.

I suspect they were just trying to sell 4 tyres instead of two but would be interested to hear any thoughts.....

Post by **Stoo.** » Sun Dec 09, 2012 11:04 am

2mm max difference according to specs.

Worked out as axle averages.

So two new tyres at 7mm on the front would be average of 7mm.

Two rear tyres, 4mm each.
Average of 4mm

3mm difference, too much.

Post by **JonG** » Sun Dec 09, 2012 11:20 am

Audi already create a difference of 3.5mm by putting 235/35 tyres on the front and 225/35 on the back.

I'd balance things up, and put your new tyres on the back, and move your rears to the front.

Post by **chunky79** » Sun Dec 09, 2012 4:27 pm

So put the narrower tyres at the front and lose grip?
Bloody awkward having different size tyres on a 4wd.

Post by **Dave_Hedgehog** » Sun Dec 09, 2012 4:31 pm

haldex like most of the modern quattro systems is not affected by different rolling radius front to rear

change the tyres on each axle when they hit the wear bars, or in the case of the contis on the front as soon as you can

Post by **adsgreen** » Sun Dec 09, 2012 5:07 pm

Dave_Hedgehog wrote:haldex like most of the modern quattro systems is not affected by different rolling radius front to rear

change the tyres on each axle when they hit the wear bars, or in the case of the contis on the front as soon as you can

Haldex should work fine.
http://www.billswebspace.com/HALDEX.pdf

Post by **JonG** » Sun Dec 09, 2012 5:50 pm

chunky79 wrote:So put the narrower tyres at the front and lose grip?
Bloody awkward having different size tyres on a 4wd.

Doh ... my bad ... forgot about the width difference

Post by **rcm63** » Sun Dec 09, 2012 6:14 pm

Thanks for your input folks.
I spoke to someone at my local VW garage todya and they said tread difference front/rear is only important on non Hadex 4wd systems.

Cat wait to get those Conti's off the front!

Post by **Carrg** » Mon Dec 10, 2012 3:42 pm

What you planning on replacing them with??

Post by **rcm63** » Mon Dec 10, 2012 3:58 pm

Probably Goodyear F1 Aysmmetric 2's. Apparently the are 2 decibels quieter too!

Post by **chunky79** » Mon Dec 10, 2012 4:57 pm

Forget the noise levels, the Assym2's are just amazing.

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