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Discussion Starter · #1 ·
Hi,

I have 4 TRW 15X7 rims.

What is the best tires size ? I would say 225X50/15. Anything to add ?

Jean-Marc from France.
 

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I've got a couple set of 15x7 rims with 225/50R15's on them. You should have a decent selection of tires available in that size.

Be aware that a 225/50R15 will have a slightly smaller overall diameter than a stock size 225/60R14. It will be about 23.9 inches vs the stock size of 24.6, so your speedo reading will be about 3% faster than your actual speed.
See this link for a great tire size calculator: http://www.miata.net/garage/tirecalc.html
 

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Discussion Starter · #4 ·
Thank you Gentlemen :)

3% faster :(

I would prefered 3% slower in order to accurate the tacho's optimism...

And between 225*60/14 and 225*50/15, which is the best road handling for a european use ?

For track days I use 205*60/14 in the front and 215*60/14 back on my 83 with "Lotus" rims.
 

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its better to have it report a faster time then your actually travelling, saves on tickets :wink:

Again, the 50 series will be far superior to the stock 14s with 60 series tires on the track or anywhere imo. 50 is just low enough that your car actually looks like it has low profile tires, and they're not too low that your ride gets super harsh. BTW, if you have a 4.3 diff, switch it to a 4.1 if you can, and your tach will work just like you had 225/60-14s on.
 

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Discussion Starter · #6 ·
SupraFiend said:
its better to have it report a faster time then your actually travelling, saves on tickets :wink:

Again, the 50 series will be far superior to the stock 14s with 60 series tires on the track or anywhere imo. 50 is just low enough that your car actually looks like it has low profile tires, and they're not too low that your ride gets super harsh. BTW, if you have a 4.3 diff, switch it to a 4.1 if you can, and your tach will work just like you had 225/60-14s on.
Ok for diff swap. I'd love to have a shorter one...for my "racy" one, 110 km.h at 6600 rpm in second gear...no good.

THE issue is that in France, 4.1 are unavailable...
 
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