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View Full Version : Tyre size and how do find rim width?



stuartturbo
09-07-2006, 02:20 PM
After picking up a puncture i need new tyres 100miles at 50mph is not funny and tramlined big time on the M25
I know the question on tyre size has been answered.
I recon i need 225/40/18 or 235/40/18 but choice in that size seem limited. is there any real difference or would 245/35/18fit

How do i know what width rim i have measures 9" at lip
Nothing is marked on rim bar 18*_ J and a wieght of 6Kg. Space saver must wiegh that much LOL

bradc
09-07-2006, 09:01 PM
The area where the _ is is where the width should be marked, is there any chance it is on any of the other rims and is just too dirty to be seen on the one you're looking at?

What size did you have before this? Did the sidewall look straight like | | or were they bent in so that the tyre was stretched over the wheel like / \ ?

If they are 8" wide I would recommend 225 or 235 tyres, I doubt they are 9" wide rims, very few people have them fitted that wide to a vr-4.

http://www.tirerack.com/wheels/tech/techpage.jsp?techid=95

Have a read of that, the actual width is measured on the inside of the lip, rather than at the top of the lip which I guess is where you've measured from.

stuartturbo
10-07-2006, 06:53 PM
Cheers At present i have falken 205 yes 205 the rim protector doesnt protrude past the outside of the lip and a space saver Doh
Getting goodyear f1 fitted with 235 profile paying the extra and hope no scrubage
will measure inside of lips when rim is off. You are correct I measured overall width but did assume them to be narrower Ray's are 8" or 9" no half sizes now i have looked.
the 18*_j is cast into the wheel so i assume the space should be stamped in after 2 piece rims all are the same

calum
10-07-2006, 10:13 PM
Unless you know you can get your money back for these tyres I would do a bit more investigation/ checking first.

It really depends on the offset of the wheels. Best looking on google for 'wheel offset' as there is a lot of info out there.

I have 18" x 8" wheels with 225/40 x 18 pilot sport 2s on and the main issue I have is the minimal clearance between the rear suspension upper arm and the tyre. There's a couple of mm at most. I would suggest checking clearances on yours before ordering wider tyres or you may be looking for a new set of tyres or spacers very soon.

You may find that the 205s are on there for a reason!

Hope this helps.

Calum

Kenneth
10-07-2006, 10:20 PM
I have 18" x 8" wheels with 225/40 x 18 pilot sport 2s on and the main issue I have is the minimal clearance between the rear suspension upper arm and the tyre. There's a couple of mm at most.

This clearance is an interesting one, I believe it to be misleading due to the shape of the arm. We managed to fit 9" wide rims with 255s on my car (+38mm offset) with no trouble whatsoever. You will have a problem if you profile is too large though. (increasing the rolling diameter)

bradc
11-07-2006, 01:36 AM
I would go with 225/40 or 235/40 myself on 18x8 rims. Depending on the offset you made need to get the guards rolled slightly

flyboy
12-07-2006, 05:36 AM
I have 225/40 18's on my 18x8's (offset +35)... I can fit 245/40 18's on the back but the front was a no-no... :thinking:

stuartturbo
15-07-2006, 08:07 PM
got 235's fitted seem ok look wide no rubbing noted yet.
best i got was £450 for a set of Goodyear F1's
Mine is lowered not sure by how much but i will have to see how it goes when it get laddened up.

edit to say there is some rubbing when ladden up shopping and passenger in back on bumps but only on drivers rear.
Will check hieghts are the same then roll/ grind arch or raise it up a small amount