I do recall reading somewhere a post (maybe not here) about how critical tyre brand/shape was at that particular size limit. Some are OK, some not.

consider Delta Mics or FK auto. Both are CE approved just like the more expensive, for instance FORGE where you pay more for the name.

So basically from advice given here I have two choices.

Run my 275x35x20 tyres with spacers or sell them and buy 255x35x20 tyres.

Can I ask how the speedo reading is affected by both ? Basically which one reads more accurately !!!!

First you need to remember that speedo most likely over-reads with stock tyres, in my expierence when speedo says 80 actual speed is 72-75. So compare speed that speedo shows you to the GPS speed to determine how big the difference is, then you can see use this site to see how much will the reading change and also see how the clearances change. http://www.willtheyfit.com/

http://forum.a8parts.co.uk/attachmen...1&d=1427549394

Very useful website ainarssems !!!!

Thank you !!!

Looks like the 255's are closer to the right speedo readings than the 275's !!!

http://img.photobucket.com/albums/10...pssmmtzv3h.png



http://img.photobucket.com/albums/10...pszrrnkc6d.png

I'm amazed Noone has commented on offset or got proper specs on the wheels the OP is running or even clarification of what is rubbing what (tyres or wheels?)!
Yet let's put 5mm spacers on to fix it!!
fix what?
Is the tyre hitting the upright, or is the wheel fouling the control arms?

The way the lower control arms mount to the hub, the only thing that can foul is the wheel itself, the tyres can't physically hit them, unless it's right out on the rear mount (Even then I doubt it).

If the wheel itself is fouling, the only solution is spacing it out, that's why the offset is important. A 9" rim should fit fine with a 35 offset.
275's should also fit fine with a 35 offset.

Sorry buddy !!!! I probably didn't give enough info !!!!!

Running D3, 9 inch wide 20" wheels which I believe are 46mm offset. The wheels themselves aren't fouling, but the tyres do foul against the uprights. I let the car roll forward and the silver of the upright has rubbed on to what I would basically call the corner of the tyre. If you follow the thread across its face and just where you start to fall down the tyres sidewall is where its rubbing.

For 275 you would need to go for 30% sidewall, not 35%.

To be fair, to regulars here that was pretty obvious from what he said in the first post and everyone correctly assumed what he has now clarified. :cool:

OK, thanks.
Having reread the first post I can now see that he was referring to the inside tyre rubbing on the upright.
I wanted to know the wheel offset as I've been reading about another D2 with D3 19" rims running 275's with a higher than spec profile (275/40x19) with no clearance issues.
His wheels are D3 turbines which have a ET45 offset.
He talks about his tyres missing the upright by a "hairs width" (but a miss is a miss when the distance is fixed). His car also has S8 suspension.
Now 1mm difference in offset is bugger all, but might be just enough, or it could be that the tyres on the 19's that this bloke chose have a slightly more rounded shoulder to give the needed clearance.
Although the 20's are a 9" wide wheel vs the 19" turbines being 8.5" wide, when talking the same width tyre, the offsets (from centre) should equal out.

So in the end, spacing will probably be the easiest option. You can buy 3mm spacers, which may give enough clearance over going to 5mm. May save the purchase of new wheel bolts...



...I'm curious about all this as I'm in the process of buying some 19x9 ET35 wheels and I'm thinking 245's might look too narrow and I was looking to 275's myself. At 30mm, we're taking 15mm either side of centre and in my case I've been wondering about guard clearance.
I'm also looking at larger profiles to fill the guards a bit better without altering the suspension. A side benefit of this of course would be a smoother ride...
I'll be sure to post to any ones curiosity once I sort out what I'll do!