So, i made an excel calculator to help me out, and i prettied it up so other people could use it. it will calculate MPH and RPM drops for a transmission. plug in the final drive ratio, transfer case ratio, and 1-6 gears, shift RPM per gear, and it'll pop out the numbers. it'll even let you compare side by side what two tire sizes will output in MPH. I've listed both Hydro and Cable trannies with their requisite gear ratios.

if you guys can think of anything i can add to it, let me know. i'm thinking i could add kph to it for people not use to imperial.

i made this because i got sick of plugging in numbers between the miata.net tire size calculator and the gear ratio calculators out there.

click for zip file