Can I mix 235/40/18 and 225/40/18 tyres?

[Nj]

I can't can I? Because the rolling surface circumference is going to be slightly different, which wouldn't play nicely with quattro?
just want to clear this up because I have a good offer for 2 of each Toyo Proxes
thanks.

**edit** I just found this thread on Audizine that says it's fine as long as the difference is under 3%

There was a link to this site, which shows the difference (details here are for my A4)

difference in circumference seems to be 1.24% if my calculation is right
(100/2,026.96) * (2,026.96 - 2,001.82)

[HPsauce]

It's roughly 4mm difference in radius, or a half-worn tread.
So probably technically acceptable, but I wouldn't do it on a 4wd vehicle.

[diesel des]

Probably different tyre manifature brands of the same size would give as much variation. I would do it.

Sent from my LG-H955 using Tapatalk

[Nj]

thanks lads. I'm on the fence. currently i'm going to end up with different brands with slightly different tread depths front and back if I replace just the two fronts. But I have the option of getting 4 brand new Toyo Proxes for a very good price because someone changed their car and has them sitting in storage doing nothing. hmmmmm....

[Error404]

The centre diff has to compensate for the different speed of rotation between front & rear axle, which is does anyway but you will be putting it under continual load, generating heat and potentially additional wear. I would say its fine if your gearbox oil is good quality & in good order. Personally I'd just get the right size rubber

[HPsauce]

I'd go for the four new and keep the better two used ones as spares.
Then if you do get a damaged non-repairable tyre you can put a matching pair on that axle.

[Error404]

[John.]

Personally I'd just get the right size rubber

205/60x15

[Nj]

haha. not on my A4 though John. 15" wheels wouldn't work too well

[Nj]

[Nj]

erm.. here's something that I should have asked at the start. Has anyone got an opinion on Toyo Proxes T1Rs? I thought initially that they were T1 Sports.

[macspring]

Michelin Pilot Sport 4

or

Dunlop SP Sport Maxx RT


235/40/18


Expensive, but worth it for peace of mind.

[Error404]

T1r - ****! (imho)

[John.]

haha. not on my A4 though John. 15" wheels wouldn't work too well

You're off the hook......Boleros look good though!

[K Simmonds]

I always say the same thing when people ask this question....unless you have a very good reason for doing otherwise run four tyre's the same size and preferably brand on a quattro, it surprising how much difference there can be between different manufacturers.

Even though I have a set on my Compomotives I'm kinda with Alex on the Toyo's, the only thing they have going for them is the price new. 888's/R1R's are awesome though IMO, however their not really a practical choice for an everyday car.

The Dunlops Dave mentions are a great tyre.