Anyone running 305/30 tires on 11.5" Rims?

[svassh]

Just bought a set of R Spec wheels. Got a great deal on 305/30 tires for the front but really struggling to find any 315 or 325/30 tires at a decent price. Considering running 305/30 on all 4 wheels. Everything I have found online says a 305 tire fits a 10.5-11.5" rim.

Anybody done this and care to share their experience?

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[lightrules]

did you go with the 6GR SEVEN wheels in gloss black?

too bad you missed this deal, only 1 left but they had quite a few at $193 a few days ago: https://www.prioritytire.com/michelin-pilot-sport-4s-325-30r19-zr-105y-xl/

 

[svassh]

did you go with the 6GR SEVEN wheels in gloss black?

too bad you missed this deal, only 1 left but they had quite a few at $193 a few days ago: https://www.prioritytire.com/michelin-pilot-sport-4s-325-30r19-zr-105y-xl/

Yes I did get the Gloss Black I did get 2 of the Sport Cup 2 305 tires a few days ago. Debating on just getting 2 more 305 Cup 2s and running them all way around even though the rims are staggered 11/11.5

 

[Deleted member 37397]

I’m not sure I’d do 305’s on the 11.5 wheel.

 

[sweetchuck2001]

I have 305's on the 11.5 R-Spec wheels on the rear. They are PS4's though. Crappy photo...

 

[Tonymustang302]

How much does it throw your speedo off going from 35 to 30’s on the gt350?

im still back n forth on if i want a spare tire/wheel combo for my 350 because i have the sve 350r’s for my grabber blue 17

i would def do 305 front an 325 rears

 

[Demonic]

It really depends on the tire. Even though two different tires may have the same width number, the actual physical width of the tire can still vary. The R spec Cup 2's tend to be on the narrower side. So even the stock 315 Cup 2 tires are slightly stretched on the 11.5" wheels. I wouldn't try to stretch a 305 Cup 2 onto an 11.5" rim. Other tires that tend to run wider may ok though.

 

[18usc371]

Just bought a set of R Spec wheels. Got a great deal on 305/30 tires for the front but really struggling to find any 315 or 325/30 tires at a decent price. Considering running 305/30 on all 4 wheels. Everything I have found online says a 305 tire fits a 10.5-11.5" rim.

Anybody done this and care to share their experience?

I am running:

6GR Five R-spec - 11F 11.5R
Nitto 555 G2 305s square

No issues street, but no track time on them, so I cannot speak to that end.

11.5" rim is within spec for 305s.

As you are probably aware, the R-spec wheels have a different offset, and will have noticeable "poke" with greater that 305s, if that bothers you.

 

[sweetchuck2001]

Mine was about 5 mph high with them before I adjusted the value with forescan.

 

[Tonymustang302]

Mine was about 5 mph high with them before I adjusted the value with forescan.

thx......i love the stock Gt350 rim.....so i’ll prob look for someone selling a set

but if you did 20’s ad 30 tire it would even out????

 

[svassh]

Yeah screw it I'm getting 315/30 or 325/30 whats the point in wider rims if you're not gonna use em?

Its only money.....

 

[lightrules]

yeah i am looking at a new set of wheels, might go 19x11 all around with 305's but if i did 19x11.5 in the back i'd go 325's myself.

 

[Txclyde1]

yeah i am looking at a new set of wheels, might go 19x11 all around with 305's but if i did 19x11.5 in the back i'd go 325's myself.

Do the 6GR’s come in non R (11”) rears ?I have the “R” size 6GR’s with 295/35 F and 30/35 R.Rear almost looks not wide enough for the wheel.Has anyone run the 305/35’s square on R size 6GR’s?How about running R size 6GR’s (11”) on front as I have and non R 6GR’s with the 305/35’s if they make them ......I hope this makes sense !!!

 

[svassh]

Do the 6GR’s come in non R (11”) rears ?I have the “R” size 6GR’s with 295/35 F and 30/35 R.Rear almost looks not wide enough for the wheel.Has anyone run the 305/35’s square on R size 6GR’s?How about running R size 6GR’s (11”) on front as I have and non R 6GR’s with the 305/35’s if they make them ......I hope this makes sense !!!

Best to message them directly but I believe they offer other sizes. Their username is Need4SpeedMotors they are having a great Black Friday special that starts officially tomorrow but I put in my order today.

 

[18usc371]

Do the 6GR’s come in non R (11”) rears ?I have the “R” size 6GR’s with 295/35 F and 30/35 R.Rear almost looks not wide enough for the wheel.Has anyone run the 305/35’s square on R size 6GR’s?How about running R size 6GR’s (11”) on front as I have and non R 6GR’s with the 305/35’s if they make them ......I hope this makes sense !!!

I don't think 6GR makes non R-spec rear wheels (11") for GT350 offsets. Maybe 5.0s, but you should ask them. They are quick to respond on their chat.

I run 305/35s square on R-specs - 11f / 11.5r - no issues.

R-spec 11" fronts - no problem - the offset is correct.

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