hi guys, just wondering how big of a tire can you fit under an fd. like what overall diameter and what width/backspacing before needing the BFH or having to roll the fenders.

I run 17" rims with 8" up front and 9" out back. 235/40 front with 275/40 back. The rears are Nitto's however.

285/40/17..... thats the fattest stock wheels i have seen on an fd.... and i have it :-D

like Fike said stock, biggest I have seen are the 19x10 245/35s on Jay Laub's wide body FD.

over fenders and body kites can take it 19 inch tires but it seems box stock 17's are it without issues



XXXRacer

I have 18X10 with 285 S0-3's (offset +52)



There is VERY LITTLE clearance between the rim and the trailing arm. No rubbing

Yeah 18x10 with a 285/30 in the rear is about the max. IF you get the right offset.



I run 18x9.5 on all 4 corners with 265/35's without any rubbing

thanks for all the info guys, it is good to know what rim sizes will fit. the other thing i wanted to know is how tall of a tire would fit. an 18" rim could have a tire with a 26" diameter or larger. tire size effects gear ratio and tire footprint(contact patch)and i was wondering how tall of a tire would ft before the wheel well would need to be made wider(as in front to back).

edit: and about sidewall markings, i only know the first is the width, second is %of tire that is sidewall, and the 3rd is rim size. i just dont know how to put it all together to say that when you stand the tire up, this is how tall it would be.

Try this tire calculater. It will give you the diameter.



http://www.miata.net/garage/tirecalc.html

does anyone have a good pic of like a 245/35 on the stock wheels? how would that be fitment wise on the wheels themselves? in the front wells?

for the tire height........ its different for every tire... for example 285/40/17, the 40 stands for 40% of the 285mm's, the best thing to do is to go to tire rack and research each tire's statistics. (if you want a guideline, use eagle f1 gs 285/40/17, imo thats the tallest that i would recommend you getting)