12-12-14, 04:39 PM
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****Official Wheel & Tire Fitment Guide for SC300/SC400****
11-23-10, 03:54 PM
#2979
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Location: NC
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Hey guys im planing on getting some xxr 521 front 18x8.5 +30 rear 18x10 +25 Im runing KYB shocks and tanabe springs. I know I might need some spacer but would I need a roll? What tire size can I use without a roll?
11-23-10, 05:05 PM
#2984
On paper yes, the aspect ratio sounds odd. Once calculated, the sidewalls for the two aspect ratios will be nearly the same.
Front: 40% of 245 (tread width) equates to 3.85" x 2 = 7.7" + 18" (rim diameter) = 25.7" overall diameter.
Rear: 35% of 275 (tread width) equates to 3.78" x 2 = ~7.6" + 18" (rim diameter) = 25.6" overall diameter.
Both of these overall diameters are nearly identical to the OEM spec of 25.7".
You could run a smaller aspect ratio on the front to give you more of the raked look if that's what you're going for. So running the 35% up front would be no problem. The rears need to be as close to the OEM spec (25.7") to calculate the correct speed reading at the speedometer.
Front: 40% of 245 (tread width) equates to 3.85" x 2 = 7.7" + 18" (rim diameter) = 25.7" overall diameter.
Rear: 35% of 275 (tread width) equates to 3.78" x 2 = ~7.6" + 18" (rim diameter) = 25.6" overall diameter.
Both of these overall diameters are nearly identical to the OEM spec of 25.7".
You could run a smaller aspect ratio on the front to give you more of the raked look if that's what you're going for. So running the 35% up front would be no problem. The rears need to be as close to the OEM spec (25.7") to calculate the correct speed reading at the speedometer.
11-23-10, 05:41 PM
#2985
Pole Position
iTrader: (5)
Join Date: Sep 2010
Location: NC
Posts: 323
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Received 0 Likes
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On paper yes, the aspect ratio sounds odd. Once calculated, the sidewalls for the two aspect ratios will be nearly the same.
Front: 40% of 245 (tread width) equates to 3.85" x 2 = 7.7" + 18" (rim diameter) = 25.7" overall diameter.
Rear: 35% of 275 (tread width) equates to 3.78" x 2 = ~7.6" + 18" (rim diameter) = 25.6" overall diameter.
Both of these overall diameters are nearly identical to the OEM spec of 25.7".
You could run a smaller aspect ratio on the front to give you more of the raked look if that's what you're going for. So running the 35% up front would be no problem. The rears need to be as close to the OEM spec (25.7") to calculate the correct speed reading at the speedometer.
Front: 40% of 245 (tread width) equates to 3.85" x 2 = 7.7" + 18" (rim diameter) = 25.7" overall diameter.
Rear: 35% of 275 (tread width) equates to 3.78" x 2 = ~7.6" + 18" (rim diameter) = 25.6" overall diameter.
Both of these overall diameters are nearly identical to the OEM spec of 25.7".
You could run a smaller aspect ratio on the front to give you more of the raked look if that's what you're going for. So running the 35% up front would be no problem. The rears need to be as close to the OEM spec (25.7") to calculate the correct speed reading at the speedometer.
Now if I go with 265 in the rear what would that put me in the front?