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The Tire Rack's Tire & Wheel Forum
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Old 04-11-2010, 05:00 PM   #1
Oz Striker
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Question What size of tyre on a 18x7.5J (ET40) rim?

yeah i know another tyre & rim question, sorry. Founds these rims on fleabay and was wanting to know what "range" of tyre sizes i could fit specifically widths. I've my car lowered on H&R Cup Comfort kit, so basically about the sport ride height. Rims are 18 inch, 7.5J and ET40

http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT

Done a bit of reading and the i think the widest i could go is 245??

I would have hoped to run a staggered set up to begin with 215/225 & 245, so it looks good, but eventually when this is my 2nd car and i "slowly" turn it into a track car would probably run 235 all round. And with them being only 7.5J they should be reasonably light (although i will check with the seller)
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Old 04-12-2010, 10:51 AM   #2
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225/40/18 is the best size, you could run a 235/40/18 without issue.
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Old 04-12-2010, 12:49 PM   #3
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Originally Posted by remedys View Post
225/40/18 is the best size, you could run a 235/40/18 without issue.
235/40/18 is actually a bit too wide for a 7.5" wheel. Recommend width is at least a 8.0" wheel. I would recommend running a 225 tire at most.

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Old 04-12-2010, 03:39 PM   #4
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Thats a shame! 225 i think would not look good at the back, nor give the levels of grip required on track where i think the recommended set up is 235 all round. Thanks for the info anyway. Least i know what to loofk for now. So i presume for a 8" wheel the widest tyre would be a 245?
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Old 04-12-2010, 07:00 PM   #5
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225/40r18
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Old 04-13-2010, 11:31 AM   #6
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Quote:
Originally Posted by Oz Striker View Post
Thats a shame! 225 i think would not look good at the back, nor give the levels of grip required on track where i think the recommended set up is 235 all round. Thanks for the info anyway. Least i know what to loofk for now. So i presume for a 8" wheel the widest tyre would be a 245?
You can always look into getting a grippier tire for track use to compensate for width for now. I would suggest looking into the AD08, RS3, R1R, Z1SS tires.

8" would be the narrowest width on a 245/35/18.

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