Nitto NT-05 on stock 07 gt fanblades (18")
#12
Look at Nitto's Website...
For "my rim" the 18" Chrome Bullits (sp?)
NT555 Tire
235/50-18 recommended rim is 6.5 (7.5) 8.5
255/45-18 recommended rim is 8.0 (8.5) 9.5
275/40-18 recommended rim is 9.0 (9.5) 11.0
Then you can use this to see the difference in rotation and width etc...
http://www.miata.net/garage/tirecalc.html
Now for your tires the;
235/45-17 it looks like you can go
The NT05
255/40-17 BUT THE recommended rim is 8.5 (9.0) 10.0
For "my rim" the 18" Chrome Bullits (sp?)
NT555 Tire
235/50-18 recommended rim is 6.5 (7.5) 8.5
255/45-18 recommended rim is 8.0 (8.5) 9.5
275/40-18 recommended rim is 9.0 (9.5) 11.0
Then you can use this to see the difference in rotation and width etc...
http://www.miata.net/garage/tirecalc.html
Now for your tires the;
235/45-17 it looks like you can go
The NT05
255/40-17 BUT THE recommended rim is 8.5 (9.0) 10.0
#14
255/50-18
255 divided by 25.4
10.03937008 x .50 TREAD WIDTH
5.019685039 x 2 SIDEWALL HEIGHT
10.03937008 + 18 RIM DIAMETER
28.03937008 x 3.141592654 TIRE HEIGHT
88.08827905 ROUND
63360 divided by 88.08827905
713 REVS / MILE
Its just an example of the math. Dont let this confuse you.....
http://www.tacomaworld.com/forum/tirecalc.php
https://www.rsracing.com/tech-wheel.html
http://www.1010tires.com/TireSizeCal...?action=submit
http://www.miata.net/garage/tirecalcold.html
255 divided by 25.4
10.03937008 x .50 TREAD WIDTH
5.019685039 x 2 SIDEWALL HEIGHT
10.03937008 + 18 RIM DIAMETER
28.03937008 x 3.141592654 TIRE HEIGHT
88.08827905 ROUND
63360 divided by 88.08827905
713 REVS / MILE
Its just an example of the math. Dont let this confuse you.....
http://www.tacomaworld.com/forum/tirecalc.php
https://www.rsracing.com/tech-wheel.html
http://www.1010tires.com/TireSizeCal...?action=submit
http://www.miata.net/garage/tirecalcold.html
Last edited by 157dB; 10-14-2009 at 11:05 AM.
#16
235/50-18 vs 255/45-18 vs 255/50-18
235/50-18
Sidewall: 4.6
Radius: 13.6
Diameter: 27.3
Circumference: 85.6
Revs/Mile: 740
255/45-18
Sidewall: 4.5
Radius: 13.5
Diameter: 27
Circumference: 84.9
Revs/Mile: 746
255/50-18
Sidewall: 5.0
Radius: 14.0
Diameter: 28.0
Circumference: 88.1
Revs/Mile: 719
235/50-18
Sidewall: 4.6
Radius: 13.6
Diameter: 27.3
Circumference: 85.6
Revs/Mile: 740
255/45-18
Sidewall: 4.5
Radius: 13.5
Diameter: 27
Circumference: 84.9
Revs/Mile: 746
255/50-18
Sidewall: 5.0
Radius: 14.0
Diameter: 28.0
Circumference: 88.1
Revs/Mile: 719
#17
alot of people run the 275 width on their oem rims. And it is almost never an issue. It will become an issue if you are an autocrosser, or like to take corners really hard. that will cause alot of sidewall flex, and might possibly unseat the bead...causing a blowout.
I'm less concerned with unseating the bead than I am with extra heat generation in the sidewall, and where specifically in the sidewall that the extra heat gets concentrated. Something called a "flex point" moves up/down over the sidewall as wheel width is varied. Not all portions of the sidewall are equally capable of handling this local flexing or the temperature that is developed.
That said, being half an inch "below spec" is something that you can get away with for short duration or low-speed driving where the tire temperatures remain low. But loading a car so equipped up to the gills with all sorts of gear and taking three of your friends on a long highway trip in the middle of a Texas summer heat wave is probably asking for trouble.
Norm
Last edited by Norm Peterson; 10-14-2009 at 09:42 AM.
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