stupid question
going through a tire ratio calculator

stock size is 18x8 +50 on 225/45/18
id go 17x10 +25 on 225/45/17
this gives a -4% error

if i go 225/50/17 there's a 0% (negligible) error

whats the difference?

The 225x50x17 are a bit taller profile than the 225x45x17 and hence closer to the stock 225x45x18 in terms of overal wheel/tire diameter which leads to similar MPH speedometer reading.

This is much in the way that 255x40x18 are close to stock 225x45x18.

Keep in mind that the second number is a profile (width/height ratio) and hence the need for a tire ratio calculator to make a fair comparison.

You are going to need tires that are shorter than stock.

prepared to be stupid low for forum members to handle but it all will look awesome.:yesnod:

I would roll them and also use 225/40/17

Will this work? =O
 

19x8 Motegi Racing rims
Size: 19 | Width: 8 | Bolt Pattern: 5x112mm | Offset: +35mm
Toyo Tires Proxes 4 245/35ZR19 93W Tires

Any help would be appreciated, Thanks a ton.

Zac

5x112 won't work. You need 5x114.3 Everything else looks OK though. You could definitely go more aggressive if you were so inclined.

I want an aggressive fit, without pulling fenders. I don't mind rolling them. Let me know if it will fit. I have looked at the aggressive thread, but there are so many pages and being in Iraq with shitty internet doesn't help. ha

front 18x9.5 + 30 or +35 235/40/18 rear18x10 +40 or +25 with 245/40/18 on tanabe nf210 springs?
or
18x9.5 +25 on lets say a 255/40/18 again with tanabe nf210 which has about a 1.2-1.5 in drop. I can't remember my measurements.

will these fit fine on my stock rims?

Bridgestone Potenza RE040
225/45ZR18

http://www.tirerack.com/tires/tires....20Transmission

^yes
that is the stock tire size for the wheels

Those came stock on bunches of rx8. Yes they will fit. 245/40/18 is usually cheaper or the same price for more tire. There are other tires that are considered better for less money ($1000 for stock size tires is RIDICULOUS). Nitto Invo, Toyo T1R, Kumho SPT, etc.

Trevors you can run the first setup 9.5 +30/35 (I'd suggest a 245/40) and 10+40 fine (265/35). The 10+25 will need a pull even with 245/40. 9.5 +25 is pushing it but could probably be run in the rear with a 255/40. You would need to trim the plastic in the rear fenders.

I found a wrecked rx8 with those bridgestone tires. they only have 4000 miles on them and the guy wants $200. Seemed worth it. Thanks for the help.

Ok great, my next question is, with the first set up 9.5 +30 and 10+40, would that be more flush than the 9.5 +25? I know everyone has different opinions on that, but i can't seem to find to reasonable pics to help my situation. I want to push my wheel and tire to the limit without pulling the fenders.

Flush depends on camber. http://www.flickr.com/photos/j863562...7623744260352/ That's 9.5 +28 with 245/40/18 in the rear and 9.5 +38 with 245/40/18 in the front. Approximately -2.2 camber. There are a couple older pictures where it is +33 in the rear and +38 in the front also. edit: I'm currently running +33F/+28R. Maybe I'll get some new pictures soon. Also contemplating a switch to 265/35s all around.

As far as suspension goes, what are you running? I think i found the size i am going to run. 18x9.5 +38 18x9.5 +25 XXR 522 with 245/40/18

I hope the 2" drop from my Sprint springs will look good
otherwise im gonna have to dump some money into adjustable shocks to use with the springs :/ (coilovers will make me broke)

are there any ways to fix the speedo (for cheap) when going 245/40 cause thats -8% on the speedo which is A LOT

+1
sprint springs=win

You don't need a speedo. It's not important. i don't have one in my FC. ha, well i do, but its kph. so i have a sticky note on the conversions. But i just drive with traffic or a little faster depending on the place and time of day.

I have JIC coilovers. The fronts are gonna be super sunken compared to the rears. The tires I have are Nitto Invo which I think are a little wider than your average 245.

You mean something like this? It was posted not too long ago in this very thread.

I have a question BigOLundh. It is all about the fender flares of my car. I don't know what will be fitted. What do you think?

im more concerned about my car's mileage going up more for no reason!

new rims thanks guys
https://www.rx8club.com/picture.php?...ictureid=18509
now im in need of a drop...... lol

would 255/35/19 rub in the front?

Yes it could rub. What size and offset is your wheel?