Mazda Rotary Club

General => General Technical => Wheels & Tyres, Suspension & Brakes => Topic started by: barry798 on November 16, 2007, 06:17:39 PM

Title: best size tyre for 18"
Post by: barry798 on November 16, 2007, 06:17:39 PM
just got my new rims and in in a dilema been told i need 225/40/18 for the front and 265/35/18 ,but also been told i need 35 for the front instead of 40 please can some one help
Title: best size tyre for 18"
Post by: shaunwil on November 16, 2007, 06:20:01 PM
http://www.miata.net/garage/tirecalc.html

Shaun
Title: best size tyre for 18"
Post by: pdtaylor18 on November 16, 2007, 06:31:23 PM
265/35 might fit the rims better and help protect the lip but 255 would be just as good, the fronts I would go for 235/40. This keeps the aspect ratio as close to original.  I take it they are 9\'s and 8\'s for the width ? as that will make a difference.
see the link for tyre sizes in the wheels section, its a sticky for this reason.
Title: best size tyre for 18"
Post by: barry798 on November 16, 2007, 06:40:55 PM
thanks they are 8,s and 9,s  just wont to make the back a bit wider.and wonted 225 so they dont rub
Title: best size tyre for 18"
Post by: pdtaylor18 on November 16, 2007, 07:28:43 PM
well the sizes i quoted will not rub but make sure the offsets are good and you will be ok.
Title: best size tyre for 18"
Post by: tinker-27 on November 16, 2007, 08:40:18 PM
235,40,18 front   265,35,18 rears  on 8" and 9" is spot on
Title: best size tyre for 18"
Post by: shaunwil on November 16, 2007, 10:31:30 PM
Try and keep the rolling radius as close to the 255x40x17 and you should be fine. The 35s just mean you have a bit more alloy than rim. The link will work out the percentage difference between original and stock.

Didn\'t think 265 was stocked as readily as 255 and 275 though.

Shaun
Title: best size tyre for 18"
Post by: barry798 on November 17, 2007, 01:59:36 PM
jet tyres in pitsea can get them for next day 265/35/18 for £150 ea think ill go for 235 on the front then and not 225
Title: best size tyre for 18"
Post by: Ed_RX7 on November 17, 2007, 02:55:55 PM
got 275\'s on my rear and my car is LOW...rear arches have been rolled though...and no problems.
Title: best size tyre for 18"
Post by: shaunwil on November 17, 2007, 05:41:21 PM
Quote from: Ed_RX7got 275\'s on my rear and my car is LOW...rear arches have been rolled though...and no problems.

What offset is the wheel ??

Shaun
Title: best size tyre for 18"
Post by: barry798 on November 17, 2007, 06:41:53 PM
the rear wheel is 9.5, did think of getting a 275 but didnt think it would go ,the car is on standard suspention as for the off set not sore fink its 35 i no the front is going to try it on the car in the morning before getting tyres fitted