370z MEATY TIRE THREAD

[cjr1881]

Originally Posted by daisuke149

based on your previous comments..

a 315/25/20 is smaller than OEM and so by your own words you shouldnt. but I think the r888 comes in 315/30/20 which would be taller than OEM.
a 285/30/20 for fronts is about perfect to oem though

Yeah those are the only tire options in 20" and they are just fine. I would rather go taller than smaller with performance upgrades I want first gear to be useable. 285/35/20 315/30/20

[FortuneLSX-TT]

Originally Posted by cjr1881

Yeah those are the only tire options in 20" and they are just fine. I would rather go taller than smaller with performance upgrades I want first gear to be useable. 285/35/20 315/30/20

315*.30= 94.5mm sidewall
20*25.4= 508mm rim
508+94.5+94.5 = 697mm overall diameter (27.44in)

vs stock
275*.35=96.25mm sidewall
19*25.4= 482.6mm rim
482.6+96.25+96.25=675mm overall diameter (26.57in)

You're increasing your rear overall tire diameter by almost an inch.

315*.25= 78.75 mm sidewall
20*25.4 = 508mm rim
508+78.75+ 78.75 = 665.5 mm overall diameter (26.2in)
The 25's drop about .4in from stock whereas the 35's add almost a full inch in those sizes.

If I was going for 20's I'd go with the 25 and not the 30, but good luck. I think first gear will still be usable in either size, but like others have said... much taller than stock. I'd be interested to see how it looks and how far off your speedo is and if you have any rubbing issues etc.

[cjr1881]

Originally Posted by FortuneLSX-TT

315*.30= 94.5mm sidewall
20*25.4= 508mm rim
508+94.5+94.5 = 697mm overall diameter (27.44in)

vs stock
275*.35=96.25mm sidewall
19*25.4= 482.6mm rim
482.6+96.25+96.25=675mm overall diameter (26.57in)

You're increasing your rear overall tire diameter by almost an inch.

315*.25= 78.75 mm sidewall
20*25.4 = 508mm rim
508+78.75+ 78.75 = 665.5 mm overall diameter (26.2in)
The 25's drop about .4in from stock whereas the 35's add almost a full inch in those sizes.

If I was going for 20's I'd go with the 25 and not the 30, but good luck. I think first gear will still be usable in either size, but like others have said... much taller than stock. I'd be interested to see how it looks and how far off your speedo is and if you have any rubbing issues etc.

There is no /25/20. He made a typo, those are the only tires available in 20". I used an offset and tire calculator and it says I will be doing 62 when my speedometer says 60. 2.8% I think it said. I don't have anything to consider because there are only 2 tires made in R888 20" - 315/30 285/35. If anyone knows of any other competition 20" tires I am all ears. I think maybe michelin, but I hate them. Other than that, I don't know of any other tire company that makes 20" competition DOT tires.