Rookie84

Well, I wanna put widest tire possible on my rear wheels as soon as I wear out 225s that are on the wheels right now. I want wider tires but I don't want to sacrifice handling, as tires that are too wide for the wheels are said to effect handling, and also look bulky compared to the wheel. So how wide should I go in the rear with 7.5" wide wheels? I'm assuming 235 or 245? Thanks in advance

Cheers!

245 ithink, it depends on the aspect ratio of the sidewalls too.

Cheers!

Tire Size &
Service Description
S.W.
Type
Rim Width
Range
(inch)
Overall Dia
(inch)
Section Width
on
Measuring Rim
(inch)
Tread
Depth
(1/32")
U.T.Q.G.
Tire Weight
(lbs.)

205/50R15 86Y BSW 5.5 - 7.5 23.1 8.5 on 6.5 8.5 220/AA/A 20
205/55R16 97Y BSW 5.5 - 7.5 25.1 8.5 on 6.5 8.5 220/AA/A 20
225/50R16 92Y BSW 6.0 - 8.0 25.1 9.3 on 7.0 8.5 220/AA/A 25
205/40R17 80Y BSW 7.0 - 8.0 23.5 8.4 on 7.5 8.5 220/AA/A 20
215/40R17 83Y BSW 7.0 - 8.5 23.9 8.7 on 7.5 8.5 220/AA/A 20
215/45R17 87Y BSW 7.0 - 8.0 24.7 8.5 on 7.0 8.5 220/AA/A 20
225/45R17 90Y BSW 7.0 - 8.5 25.1 8.9 on 7.5 8.5 220/AA/A 22
235/45R17 93Y BSW 7.5 - 9.0 25.5 9.4 on 8.0 9 220/AA/A 20
245/40R17 91Y BSW 8.0 - 9.5 24.8 9.9 on 8.5 9 220/AA/A 23
245/45R17 95Y BSW 7.5 - 9.0 25.8 9.7 on 8.0 9 220/AA/A 25
245/45R17 * 95Y BSW 7.5 - 9.0 25.8 9.7 on 8.0 9 220/AA/A 32
255/40R17 94Y BSW 8.5 - 10.0 25.1 10.3 on 9.0 9 220/AA/A 25
255/45R17 98Y BSW 8.0 - 9.5 26.1 10.1 on 8.5 9 220/AA/A 20
275/40R17 98Y BSW 9.0 - 11.0 25.7 11.0 on 9.5 9 220/AA/A 28
285/40R17 101Y BSW 9.5 - 11.0 26 11.5 on 10.0 9 220/AA/A 20
215/35R18 80Y BSW 7.0 - 8.5 23.9 8.7 on 7.5 8.5 220/AA/A 20
225/40R18 88Y BSW 7.5 - 8.0 25.1 9.1 on 8.0 8.5 220/AA/A 22
235/40R18 91Y BSW 8.0 - 9.5 25.5 9.6 on 8.5 9 220/AA/A 23
245/40R18 93Y BSW 8.0 - 9.5 25.8 9.9 on 8.5 9 220/AA/A 25
265/35R18 93Y BSW 9.0 - 10.5 25.4 10.8 on 9.5 9 220/AA/A 26
275/35R18 95Y BSW 9.0 - 10.5 25.7 11.1 on 9.5 9 220/AA/A 20
275/40R18 99Y BSW 9.0 - 11.0 26.7 11.0 on 9.5 9 220/AA/A 20
275/40R18 * 99Y BSW 9.0 - 11.0 26.7 11.0 on 9.5 9 220/AA/A 36
295/35R18 99Y BSW 10.0 - 11.5 26.1 11.9 on 10.5 9 220/AA/A 31
235/35R19 86Y BSW 7.5 - 9.0 25.5 9.6 on 8.5 9 220/AA/A 20
245/35R19 89Y BSW 8.0 - 9.5 25.8 9.9 on 8.5 9 220/AA/A 20

Rookie84

Thank you! I guess I'll go with 245/45/17 then. Thanks a lot!!

rynberg

To maintain stock wheel+tire diameter, you would need to run a 245/40 17 tire. This is not recommended for a 17x7.5 wheel. Stick with the 225/45 17 size.

Rookie84

I can live with a bit of diameter increase.

rynberg

A 245/45 17 is an INCH taller than stock. That will raise your final drive ratio, making your car slower and your speedo inaccurate.

UnSeeN

rynberg is right

Stock 225/45 16
Side Wall: 4.4 in
Radius: 12.4 in
Diameter: 24.9 in
Circumf: 78.1 in
Revs/Mi: 811.0

Proposed 245/45 17
Side Wall: 4.3in
Radius: 12.8 in
Diameter: 25.7 in
Circumf: 80.7 in
Revs/Mi: 785.0

This says your spedo reading will be 3.33% off reading 62 mph when traveling 60mph.

This is according to the Tire Size Calulator in the sticky second from the top of this forum.

Rookie84

Will it have a huge effect in acceleration and speedo reading then? 3.33% doesn't sound like much...

Rookie84

help...? I'm buying a pair of tires for rear pretty soon...

Cheers!

You still have your stock wheels rigth? If you do then just put whatever u want for your new rims.

Use your stock rims for real racing with a set of R compounds in 225/50/16.

I doubt u are using 100% of your car's capability on the street anyways, so who cares if you are going to lose some torque due to the final gear ratio.

Rookie84

So is the torque that I lose will be noticeable? I'm gonna be running at around low 300rwhp range after retuning.