Toyo 345/30/20 can not find

Are you sure on the size? Mine is a 345/25-20 in the Proxes T1R and is the same diameter or close to stock. Don’t think they have it in the 345/30-20

Quote from Chain

I was just going off what my tire says now. 305/30/20

Are you looking to go wider? If so and want to keep the same look/diameter go with a 345/25-20 and You will need to make wheel is wide enough. I have 12-inch width

Quote from Chain

Yes my rim is 12 inches wide. I do want to go wider but to keep the speedometer correct I should keep the 30 ride height correct.

You need to be looking at diameter to maintain an accurate speedo reading.

The only 345 Toyo makes is the T1R Proxes sized 25/20 as Shane stated. 5mm is barely visible to the eye and if you do a gps vs. speedo check I would be surprised if there was more than 1 mph difference. Somebody here can steer you to a site to confirm this. I have one with 2000 miles and two 235/35/19 fronts I took off when I bought new Forgestar wheels 19" all around. Would sell as a set only for $500/fair offer + shipping.

Quote from Chain

Yes my rim is 12 inches wide. I do want to go wider but to keep the speedometer correct I should keep the 30 ride height correct.

With a 345/25R20 you will be within 1mph of what you are now. At 60mph with the 305 tire you will be at 59.1mph with the 345/25 and about as close as you can get.

This tool will give you a pretty good idea of the speedometer impact from different tire sizes -

https://www.discounttire.com/learn/tire-size-calculator.

http://www.willtheyfit.com provides a visualization of the differences in tire size/profile, wheel diameter/offset, but the speedo estimate is incorrect.

with the 12 inch wheel, you want the 345/25/20 tire for sure. The 345 is the tread width in mm. The aspect ratio (20/25/30 etc) is the percentage of sidewall to tread. So a simple rule of thumb is whenever you go to a wider tire (265 to a 285) you also go DOWN in aspect ration from like 30 to 25, 25 to 20 etc to keep approximately the same overall tire height

I will get a current pic later today to make sure it's the 345 Toyo. That may have been the 295 on the stock wheel - just don't remember and didn't label the pic properly

Quote from Chain

That a 345 with no spacer because that looks like my spacing with a 30

Here is the 345 Toyo on back before I changed it up. Note that I had the QA1 shock which I believe is a little big diameter

Quote from Chain

ok you convinced me, I gonna pull the trigger, I just did not want them to get it mounted and call me back telling me it will not fit.

Almost bought a spacer just in case.

Just make sure they put it on going in the right direction of rotation.

Chain, thanks so much for having me check my rear tire/shock clearance. I'll post up pics when I have a chance over the weekend. BUT I did find something that i didn't plan on seeing. The inside (shock side) shows signs that the sidewall has in fact come in contact with the shock. I'm pretty sure that it happened when i dropped the air pressure down real low for some extra traction attemps, and had to hit some high speeds turns as well. I'm sure if I went back up to the recommended 32 PSI, the sidewall would not flex as much and would not have made contact. When I pull it off, I'll make sure it hit the adjuster and not the spring. If so (since I don't adjust ride height at all) I'll just grind down the tab that is closest to the tire

As promised, here's the 345/25/20 Toyo mounted on a stretched stock SL wheel

Notice in pic #4, the slight tire rub against the spring due to the extreme low pressure I ran that allowed the sidewall to flex excessively in hard cornering. Not rubbing to badly as it only took off some of the lettering and no where near having belts showing. But it will be due for replacement within the next couple thousand miles (or 50 burnouts) whichever comes first