Fixing to get new tires. Larger/smaller?
#1
1st Generation Admin
Thread Starter
Fixing to get new tires. Larger/smaller?
I'm currently running BFG All-Terrain LT 305/70/R16 on some Center-Line 16" rims. I think the rims are 10" wide. The rear gearing is the stock 3.5x, the trans a non lock-up A518.
With these tires my best in the quarter is 13.90.
My current set of tires are a bit on the thin side with one somewhat egg shaped.
Would there be any benefit to slightly altering the tires OD?
For example: The current tires are about 33" in diameter. Going to a 275 would be 31.2" (with the tread width shrinking about an inch).
I'm using the Miata.net Tire Size Calculator http://www.miata.net/garage/tirecalc.html to help better visualize what things might look like.
Would I be correct in considering a dyno sheet to help the cyphering?
Based on the above, my HP starts rolling off at 100mph (I've got another print-out that shows the actual engine RPMs . . .. somewhere).
What'chawl reckon?
With these tires my best in the quarter is 13.90.
My current set of tires are a bit on the thin side with one somewhat egg shaped.
Would there be any benefit to slightly altering the tires OD?
For example: The current tires are about 33" in diameter. Going to a 275 would be 31.2" (with the tread width shrinking about an inch).
I'm using the Miata.net Tire Size Calculator http://www.miata.net/garage/tirecalc.html to help better visualize what things might look like.
Would I be correct in considering a dyno sheet to help the cyphering?
Based on the above, my HP starts rolling off at 100mph (I've got another print-out that shows the actual engine RPMs . . .. somewhere).
What'chawl reckon?
#2
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Location: Pasadena, MD
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with 3.54 gears i would look at something between 31 and 33 inches. wider tires are worse on mileage, period. but to me a tall skinny tire looks goofy so you have to give and take a little. im running 35x12.50's and am going smaller with my next set because towing with them isnt fun up mountains but power might not be a problem for me in the near future hopefully.
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