can you run a 28" rear tire without clearance issues?

[darkostoj]

I want to fit some taller DR's in the rear since i really like the way they look and want some better hooking at the strip.

I am looking at these toyo proxes TQ and heard great things about them. They are a 345/40/17 size (27.7" tall, 13.7" wide) and the best thing is they are only $170 each! I was wondering if anyone knows if I'll have clearance issues anywhere. I've done a search but havent come up with much info


TOYO Proxes TQ P345 40R17 LL @ TiresDirect.Net

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[RobZilla]

Measure from the top of your rim to the fender well. If you have an inch or so gap, you'll prob be okay. You gotta remember on launch the rear is gonna fall as the front rises.

 

[dave6666]

I run a 28" PS2 on my stock sprung '01 GTS. They rub on big bumps.

Moral of story - go to a track that doesn't ****.

 

[Ray W]

Maybe e-mail Doug Levin. I can't remember if it is 28" or 28.5" that won't fit because of the inner fenderwell in front of the tire. I think you can go up to 29" with the inner fender removed.

 

[dave6666]

Maybe e-mail Doug Levin. I can't remember if it is 28" or 28.5" that won't fit because of the inner fenderwell in front of the tire. I think you can go up to 29" with the inner fender removed.

Pic of that here.

http://forums.viperclub.org/rt-10-gts-discussions/624717-pics-showing-20-rear-tire-rub.html

 

[1TONY1]

28" Mickey Thompson ET street will rub at the upper front and that's even after removing some frame metal at the front of the lower wheel well. It might work without removing the metal but after it rubbed through the plastic and got to the metal it would start cutting the tire. I haven't done them, but there are some alignment tricks that can be done to move the rear wheel back....that might get what you need.

 

[JayW1]

It must depend on the car. I have a 2000 GTS at the stock ride height that I run 28" PS2's on with no rubbing at all. The tires are very close to the lower front wheel well but will move up and down with no issues.

 

[1TONY1]

It must depend on the car. I have a 2000 GTS at the stock ride height that I run 28" PS2's on with no rubbing at all. The tires are very close to the lower front wheel well but will move up and down with no issues.

Ah...tire growth. I'm not sure how DR's will do but my ET street will grow at high speeds. Dr would probably be between a true radial and a slick or ET street.

 

[darkostoj]

man i wish i could find someone who has these toyo DR's mounted. they spec out at 27.7...so maybe they will just get by with a hair of clearance and no rubbing

 

[fe4snake]

man i wish i could find someone who has these toyo DR's mounted. they spec out at 27.7...so maybe they will just get by with a hair of clearance and no rubbing

I think that spec is not right. I just did the calculation for you, just follow the math this works for all tires.

• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 17 in (wheel diameter) = 25.15 in. not 27.7 in
• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 18 in (wheel diameter) = 26.15 in.
• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 18 in (wheel diameter) = 27.15 in. (stock tire for all Gen III & IV)
• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 20 in (wheel diameter) = 28.15 in.

That has to be a missprint, beacause it does not make any sense.

 

[darkostoj]

I think that spec is not right. I just did the calculation for you, just follow the math this works for all tires.

• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 17 in (wheel diameter) = 25.15 in. not 27.7 in
• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 18 in (wheel diameter) = 26.15 in.
• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 18 in (wheel diameter) = 27.15 in. (stock tire for all Gen III & IV)
• Diameter = 345 mm / 25.4 mm (conversation) x 0.30 (aspaect ratio) x 2 (sidewalls) + 20 in (wheel diameter) = 28.15 in.

That has to be a missprint, beacause it does not make any sense.

if you go here it shows 27.9

Metric To Inches Tire Size Conversion

so i havent thought about this, but what do you guys think would happen with the stock gearing and a 28" tire? Would that just not be a good setup at all?

 

[fe4snake]

if you go here it shows 27.9

Metric To Inches Tire Size Conversion

so i havent thought about this, but what do you guys think would happen with the stock gearing and a 28" tire? Would that just not be a good setup at all?

I just did, and is giving the same thing that I calculated out to 25.1" not 27.7".

 

[1TONY1]

I would go with the manufacturers specs rather than some aspect ratio calculator

PROXES TQ | Toyo Tires

That 27.7 spec is on a 12" whell. On a 13" wheel it will probably get shorter.

I just got my Hoosier drag radials yesterday and they are ssssssssssssssssssssssoft !!!