It was explained to the by a guy at discount tire that on a 255/35 that the 255 is the width (I think we all no that) but what i didn't realize is that the 35 (second number) is the side wall height that is roughly 35% of the width. So when you go to a larger tire the second number gets smaller. It doesn't necessarily mean the front tire on let's say a 265/35 has a taller sidewall than a 305/30 (while ther is some difference it's not much). I found this website (1010tire.com) as a useful tool for me since I'm looking to keep the same diameter as the stock tires but go to a 20" rim and wider tires.

Yes that is all common knowledge, but glad you learned something.

If you guys aren't, you should really be using a site like this: Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

For the left hand column, put in the stock wheel and tire size. For the right hand column, put in the wheel size you're testing or expecting to fit. Play around with the tire size to get something close to stock diameter. It even tells you how the tire size and wheel width/offset affects fitment and speedometer readings and other cool stuff.

It's a quick and simple tool but super effective in helping you choose your next setup. :tup:

Other than that, nailing the perfect fitment comes down to setting your ride height where you want it, setting your camber to where you want it, and then fine tuning everything with some spacers. Use a ruler to measure how much outer clearance you have to figure out what offset wheels to go with.

Yep, what they said, i want to keep the overall heights as close as possible.

On stock roadster 19" sport rays can I go 305/30 in rear and 275/35 in front with no spacers? And any change if I lowered the car 1.25"? Anyone have pics of a similar set-up???

Love this thread

JVerge...

I just ordered my new tires the other day for my stock 19" Sport Rays... Bridgestone Potenza S04 Pole Positions (265/35/19 Fronts & 305/30/19 Rears). I currently have the stock Bridgestone tires on the car now, so I will indeed get before and after shots to post. I am also planning to lower the car on Swift springs, and later add spacers. I'll hopefully have this done within the next week or two... so pictures will be posted soon!

Just added the S04 in the same sizing to my car, pretty happy with them compared to OEM its a night and day difference.

I had 305's with swifts. A warning to make sure to get adjustable camber arms for the rear or the insides will wear very fast. Also, wait to buy rear spacers until you get the camber adjusted, mine are currently pretty flush with 20mm spacers and 285's.

Hey thanks for the heads up, I'm looking to get my tires and ride for about a week. Then I'll go ahead install the Swifts, and get an allignment. I had already planned on getting the rear camber arms, but now I'll just go ahead and order a pair. Do you reccommend a specific set? And I am for sure gonna wait on the spacers until everything has settled.

Good to know you are enjoying them, do you have any recent pics of your setup?

I got the SPL Titanium Rear Camber links. They seem really solid and well made.

I want to see some "Meaty Tires" here. Some like 295+ on the front and 325+ on the rear. Would love to see 315's on the front and 355's on the rear. :yum:

Awesome thanks for that info, I'll do some searching on here and see what everyone else is running, and what they recommend. Pictures to come soon !

Getting some beef bangers on.

Sent from my SAMSUNG-SGH-I527 using Xparent BlueTapatalk 2

Thanks for the heads up. Can't wait for pics and your opinions on results. Good luck with everything. Waiting on a supercharge kit from GTM, then want to work on traction/handling.