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wondering what your rpms are running with 3:73's and/or 4:10's

going to run 285-40-17's

car is a 94 9c1
 

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I believe it'll be around 2,200.
 

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Tire calculator says this is a 26" tire. I have a 26" tire and it lowers my gear ratio to below 3.73 which is OK but doesn't look as good as a 27" tire. IMO, the best looking tire is 28" for the wagons but it will raise (lower numerically) your ratio a bit.

255/50/17 = 27"
255/55/17 = 28"

http://www.miata.net/cgi-bin/tirescgi

Even if your 9C1 is not a wagon, you need all the gears you can get to move the heavy beast, especially if doing any towing or going through the mountains.

Here is a great RPM / gear calculator:

http://www.car-videos.net/tools/spe...o7=&Redline=5500&Increment=100&B1=Recalculate
 
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