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Discussion Starter · #1 ·
I saw a RS1.0 rollin by this morning and I really like the tires on it (in terms of width) so I was wondering, what are the tire size specs on that car.....couldnt find in a search.......I know it has 18's....just want the tire info
 

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225/40/18
 

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Discussion Starter · #5 ·
EEKEEEEEEEEK!

Thats a rather big change in the wheel size/shape. according to this tire calculator: http://www.miata.net/garage/tirecalcold.html, a 225/40/R18 is 5.5% slower when it comes to Revolutions per minute at 60mph. Is this calculation wrong? the formula looks legit. So what it basicly is saying is that when the speedo is at 60mph, its actually going 63.3mph compared to the 215/40/R17 stock tire size.

what do you all think?

also, according to that same calculator, a 245/30/R18 would be the closest fit to stock diameter. But who on earth makes a 245/30/R18 ????

 

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Originally posted by Daniel Isaiah@Aug 24 2005, 02:31 PM
EEKEEEEEEEEK!

Thats a rather big change in the wheel size/shape. according to this tire calculator: http://www.miata.net/garage/tirecalcold.html, a 225/40/R18 is 5.5% slower when it comes to Revolutions per minute at 60mph. Is this calculation wrong? the formula looks legit. So what it basicly is saying is that when the speedo is at 60mph, its actually going 63.3mph compared to the 215/40/R17 stock tire size.

what do you all think?

also, according to that same calculator, a 245/30/R18 would be the closest fit to stock diameter. But who on earth makes a 245/30/R18 ????

Actually, the stock tire is 215/45/R17 NOT 215/40/R17 like you listed.

Still, there is a different of about 1/2 inch (.47 inch) in diameter, the stock tire being smaller.

I did my own calculation which came out to be the same as the tire calculator. The result comes out to be about 1.9% too slow on the reading on the 18" wheel. It's saying that you will be doing 61.1 when your speedometer is saying 60.

Also, you'll need to use 245/35/R18 to be closely matched with the stock tire NOT 245/30/R18.

 

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lol YOU HAVE 18 foot rims????...lol sorry but thats what is says in the topic header...hehe...18" not 18' i hope
 
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