Want to put wider tires on IS-F
#1
Instructor
Thread Starter
Want to put wider tires on IS-F
Stock IS-F
Front: 225/40R19 on 8" wide rim
Rear: 255/35R19 on 9" wide rim
What is the widest tire I can use on the stock IS-F rims? My dealer is considering buying back the stock tires so I can purchase wider ones.
I used a online tire size calculator http://www.powerdog.com/tiresize.cgi and I got the following.
Specification Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
225/40-19 3.5" 13.0" 26.1" 82.0" 773/mi 60MPH 10000mi N/A
235/40-19 3.7" 13.2" 26.4" 82.9" 764/mi 59MPH 9881mi 1.2%
235/35-19 3.2" 12.7" 25.5" 80.0" 792/mi 61MPH 10240mi -2.3%
245/35-19 3.4" 12.9" 25.8" 80.9" 783/mi 61MPH 10130mi -1.3%
Specification Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
255/35-19 3.5" 13.0" 26.0" 81.8" 775/mi 60MPH 10000mi N/A
265/35-19 3.7" 13.2" 26.3" 82.6" 767/mi 59MPH 9895mi 1.1%
265/30-19 3.1" 12.6" 25.3" 79.4" 798/mi 62MPH 10304mi -2.9%
275/30-19 3.2" 12.7" 25.5" 80.1" 791/mi 61MPH 10208mi -2.0%
Any suggestions? I don't like the current look of the narrow tires on the IS-F. I like the sidewalls to be straight vertical rather than to curve toward the tread. I don't want a buldging look either.
My thought is to go with 235/40R19 and 265/35R19. Of course this will increase the diameter which the speedometer will show slower.
Chu...
Front: 225/40R19 on 8" wide rim
Rear: 255/35R19 on 9" wide rim
What is the widest tire I can use on the stock IS-F rims? My dealer is considering buying back the stock tires so I can purchase wider ones.
I used a online tire size calculator http://www.powerdog.com/tiresize.cgi and I got the following.
Specification Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
225/40-19 3.5" 13.0" 26.1" 82.0" 773/mi 60MPH 10000mi N/A
235/40-19 3.7" 13.2" 26.4" 82.9" 764/mi 59MPH 9881mi 1.2%
235/35-19 3.2" 12.7" 25.5" 80.0" 792/mi 61MPH 10240mi -2.3%
245/35-19 3.4" 12.9" 25.8" 80.9" 783/mi 61MPH 10130mi -1.3%
Specification Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
255/35-19 3.5" 13.0" 26.0" 81.8" 775/mi 60MPH 10000mi N/A
265/35-19 3.7" 13.2" 26.3" 82.6" 767/mi 59MPH 9895mi 1.1%
265/30-19 3.1" 12.6" 25.3" 79.4" 798/mi 62MPH 10304mi -2.9%
275/30-19 3.2" 12.7" 25.5" 80.1" 791/mi 61MPH 10208mi -2.0%
Any suggestions? I don't like the current look of the narrow tires on the IS-F. I like the sidewalls to be straight vertical rather than to curve toward the tread. I don't want a buldging look either.
My thought is to go with 235/40R19 and 265/35R19. Of course this will increase the diameter which the speedometer will show slower.
Chu...
Last edited by ChuH; 03-03-08 at 09:56 PM.
#2
BahHumBug
iTrader: (10)
i suggest you get a different calculator, when was the last time u saw a tire with an 80" diameter on a CAR!
http://www.1010tires.com/TireSizeCal...?action=submit
http://www.1010tires.com/TireSizeCal...?action=submit
#3
Maintenance Moderator
iTrader: (2)
i suggest you get a different calculator, when was the last time u saw a tire with an 80" diameter on a CAR!
http://www.1010tires.com/TireSizeCal...?action=submit
http://www.1010tires.com/TireSizeCal...?action=submit
I think I would stay as close to stock as possible, and do the 235/40 and 265/35's shorter wouldn't look good I don't think, and thats just a small amount taller...
#5
Lexus Champion
Pretty much any wider size you use will look goofy due to the narrow OE wheels.
Also, remember that putting an over-wide tire on an under-wide (for lack of a better term) wheel can actually decrease the performance characteristics of the tire. A 9" wheel is definitely on the narrow side for a 275 tire.
With the proper wheel widths and offsets, 255 front & 295 rear is possible on the IS-F with NO fender modifications.
Also, remember that putting an over-wide tire on an under-wide (for lack of a better term) wheel can actually decrease the performance characteristics of the tire. A 9" wheel is definitely on the narrow side for a 275 tire.
With the proper wheel widths and offsets, 255 front & 295 rear is possible on the IS-F with NO fender modifications.
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