2001 Volvo S80 T6 - Tire size questions

[agraves138]

The stock size in my S80 is 225/50/R17 but I'm in need of tires. I found a good deal on a set of 4 tires 225/45/R17, will this upset anything or affect anything in the cars system? Any lights? Warning?

[Volvo S80]

You can`t put 225/45 on R 17 wheels it will be unsafe as Volvo specified. And i recommend to avoid 45 because it will give a much bumpy ride to your car but much more sporty feeling so you decide.
Volvo S80 2001, 2.8 T6
Tire Rim Bolt pattern THD CB
215/55 R16 7x16 ET49 5x108 M14 x 1.5 65.1
225/55 R16 7.5x16 ET40 5x108 M14 x 1.5 65.1
225/50 R17 7.5x17 ET42 5x108 M14 x 1.5 65.1
235/45 R17 8x17 ET38 5x108 M14 x 1.5 65.1
225/45 R18 8x18 ET38 / 7.5x18 ET42 5x108 M14 x 1.5 65.1
225/45 R18 8x18 ET38 5x108 M14 x 1.5 65.1
235/40 R18 8x18 ET38 5x108 M14 x 1.5 65.1
245/40 R18 8x18 ET38 5x108 M14 x 1.5 65.1
245/35 R19 8.5x19 ET35 / 8x19 ET40 5x108 M14 x 1.5 65.1
245/35 R19 8.5x19 ET35 5x108 M14 x 1.5 65.1

[johnboneske]

% difference in sidewall height is fine...dont listen to the BS... Do you know how to figure out what the size means? in your 225/50/17 vs your 225/45/17 they are 225MM wide which there are 25.4MM per inch so 8.85" wide, by 4.425 high, by 17" wheel. So if you want to figure out the height it is 4.425+17+4.425+25.85", and the circumference is x 3.14159= 81.210" around... the tires your looking at are same width, 3.98 sidewall height so it is 24.96" height and 78.41" around... there are 63,360" per mile...figure it out...how many revs per mile, your speedo will show faster than you are going though...