Bullet Posted February 6, 2013 Share Posted February 6, 2013 Im looking at buy a set of wheel that are 18x 8.5 front and 9.5 rear Im really not sure on what tyre sizes i should be looking for any advice would be great Quote Link to comment Share on other sites More sharing options...
roadtrip Posted February 6, 2013 Share Posted February 6, 2013 I would have thought something like 245/40 front and 275/40 rear would be a good place to start. Quote Link to comment Share on other sites More sharing options...
Bullet Posted February 6, 2013 Author Share Posted February 6, 2013 Im confused wouldn't i need to go to 35 profiles if i went that much wider ? Quote Link to comment Share on other sites More sharing options...
MITZ@CougarStore Posted February 6, 2013 Share Posted February 6, 2013 35 profile works for 19" wheels... Quote Link to comment Share on other sites More sharing options...
ATTAK Z Posted February 6, 2013 Share Posted February 6, 2013 Aim for a similar rolling radius as the standard OEM tyres for 18" wheels Quote Link to comment Share on other sites More sharing options...
Bullet Posted February 6, 2013 Author Share Posted February 6, 2013 (edited) front Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0% 245/35-18 3.4in 12.4in 24.8in 77.8in 815 -1.3% Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0% 245/40-18 3.9in 12.9in 25.7in 80.8in 784 2.5% rear Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0% 275/35-18 3.8in 12.8in 25.6in 80.4in 788 2.0% Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 245/40-18 3.9in 12.9in 25.7in 80.8in 784 0.0% 275/40-18 4.3in 13.3in 26.7in 83.8in 756 3.7% But from that aren't 35 profiles much closer to standard roll radius ? Edited February 6, 2013 by Bullet Quote Link to comment Share on other sites More sharing options...
roadtrip Posted February 6, 2013 Share Posted February 6, 2013 The standard 18" sizes are 225/45 front (26.0" diameter) and 245/45 rear (26.7" diameter) so 40 profile is definitely what you want if you're going wider. 255/40 is 26.0" but would probably be a bit too wide for your 8.5" front rims so I'd stick with 245/40 if you can. Quote Link to comment Share on other sites More sharing options...
Gudzy Posted February 6, 2013 Share Posted February 6, 2013 245/35/19 front and 275/35/19 are the usual recommendations for 19" wheels Quote Link to comment Share on other sites More sharing options...
smudgedon Posted February 6, 2013 Share Posted February 6, 2013 245/35/19 front and 275/35/19 are the usual recommendations for 19" wheels Depends what width they are Quote Link to comment Share on other sites More sharing options...
Gudzy Posted February 6, 2013 Share Posted February 6, 2013 245/35/19 front and 275/35/19 are the usual recommendations for 19" wheels Depends what width they are True, depends on the tyre itself also as to what width wheel is specified to fit, but those sizes keep the rolling radius as close as possible to stock. The OP stated he was looking at 8.5j front and 9.5j rear wheels so my recommendation is valid for those wheel widths. Although if you want stretched tyres, that's different altogether... Quote Link to comment Share on other sites More sharing options...
smudgedon Posted February 6, 2013 Share Posted February 6, 2013 I want a little bit of stretch, not too much, so I'll be opting for 235/35/19 and 255/35/19 on my wheels, 8.5fronts and 9.5rears Quote Link to comment Share on other sites More sharing options...
roadtrip Posted February 7, 2013 Share Posted February 7, 2013 The OP was asking about a wider 18" setup and not 19" wheels and was referring to the standard rolling radius. No offsets were mentioned but if they're very low offset and the car is lowered then a bit of stretch might be appropriate in which case the standard 18" tyre sizes may be the best option. Of course there's nothing wrong with changing the rolling radius completely if that's the intention and speedo accuracy isn't a concern, as long as the ratio between front and rear sizes stay much the same. Quote Link to comment Share on other sites More sharing options...
buster Posted February 7, 2013 Share Posted February 7, 2013 Im looking at buy a set of wheel that are 18x 8.5 front and 9.5 rear Im really not sure on what tyre sizes i should be looking for any advice would be great i run the standard tyres sizes on the same spec as you mention.tyres are slightly stretched but looks the part ...lowered on super street coilover s and spacers fitted. REAR ARCHES ROLLED AND no rubbing HOPE THIS HELPS Quote Link to comment Share on other sites More sharing options...
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