245/45/18 vs. 255/45/18 -- Front and/or Rear, Any Issues? - Pontiac Solstice Forum
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post #1 of 18 (permalink) Old 02-11-2017, 12:33 PM Thread Starter
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245/45/18 vs. 255/45/18 -- Front and/or Rear, Any Issues?

I am going to purchase new Bridgestone Potenza S-04 Pole Position tires for the 08 GXP. Question is, does it make any sense for a "summer only" low mileage driver of the GXP like me to buy 255/45/18s for the rear. The 255s are just .4" inches wider and there plenty of room for that in the rear and have the same sidewall height. As these tires are "unidirectional" I'd be stuck with leaving them on the rear unless I had them remounted and rebalanced for rotation to the other side. Even with 245s all around I can at least move them to front. Any thoughts?

WEB INFO:
The S-04 is a unidirectional asymmetric tire, the inside of which is tuned for wet handling, and the outside for dry (this is absolutely not a tire for winter driving; it is described as a “summer” tire by Bridgestone). The wide inside grooves are designed to provide rapid water evacuation, improving drainage of excess water from the rib area into main grooves for hydroplaning resistance. High silica (silicon dioxide) content improves traction in wet conditions by increasing flexibility of the tread compound.

The outside section of the S-04 is tuned for dry handling, and according to Bridgestone, the footprint is optimized for even contact pressure across the whole tread surface. Compared with the RE050A Pole Position, the S-04 Pole Position has wider, stiffer shoulder blocks to help maximize road contact and precision handling through corners.

Additionally, the S-04 features an interlocking centre rib that also improves responsiveness and handling, along with a higher stiffness centre block and a rayon body ply for high speed durability.

As with other Bridgestone tires, the S-04 uses a Resonance Noise Attenuated (RENOA) silencer groove to help minimize noise and provide a quiet ride.
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post #2 of 18 (permalink) Old 02-11-2017, 06:08 PM
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From what I've learned while researching tire size if it fits on the back, you'll have no trouble fitting it in the front. Most will suggest a square setup (same size front and back) because you can still rotate, and it will keep the performance balanced. I went with a staggered setup because I wanted that look. I have 275's in the rear and 245's in the front.
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post #3 of 18 (permalink) Old 02-11-2017, 07:16 PM Thread Starter
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A.J.V, did you notice any for change in handling with the staggered setup? Better, worse or the same? Agree the look would be better.
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post #4 of 18 (permalink) Old 02-11-2017, 08:25 PM
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If you want optimal handling never go over the max recommended rim width for any specific tire. Look at the specific tire manufacturer specs for the recommended rim width range. FWIW most 255's are too wide to be recommended for 8 inch width wheels.
Sting Ya likes this.

Last edited by kwtoxman; 02-12-2017 at 02:19 PM.
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post #5 of 18 (permalink) Old 02-12-2017, 04:01 AM
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Quote:
Originally Posted by ColoradoGXP View Post
A.J.V, did you notice any for change in handling with the staggered setup? Better, worse or the same? Agree the look would be better.
I didn't get a before baseline, nor have I pushed it after the new wheels to see what's different.


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post #6 of 18 (permalink) Old 02-12-2017, 11:08 AM Thread Starter
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Good to know, will stick with 245s.
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post #7 of 18 (permalink) Old 02-12-2017, 11:26 AM
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Been running 255s for years with 0 issues. The only thing is that it throws the speedo off 3-4 mph. Didn't stagger them, though.

It's sticky!!!
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post #8 of 18 (permalink) Old 02-12-2017, 11:38 AM
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Good call to stick with stock size.
Consider spending $40 more a tire and getting the Michelins PSS.

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post #9 of 18 (permalink) Old 02-12-2017, 10:55 PM
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Buy the 71R and leave the SS's where they belong. lol

Bill have you tried the Potenza RE71R tire. I really do not think there is a comparison between the two tires. I have the SS's on my stock Redline and Potenzas on my tuned Redline. Drive them back to back, and I really do not like the SS's. I have to run 38 pounds in them to keep them from feeling like silly putty. I know the autocrossers mostly use the Potenzas, very few SS's. But other than that I only know Robo has the 71R's.
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post #10 of 18 (permalink) Old 02-13-2017, 08:13 AM
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The PSS have a wear rating of 300 while the 71Rs have one of 200, so will wear out more quickly. The 71Rs are better for slalom, but don't have as good a wet rating as the PSS. Wet is a real factor up here in the rain forest, so for me the PSS were the better choice. Different story for the guys that live in southern climes or never drive in the wet.

I ran Bridgestones on the track in years past, but nothing at all recent so have no personal experience with the 71R.

http://www.autos.ca/auto-product-rev...re-shootout/2/

Quote:
So which tire would I buy with my money? To be honest, whichever one is on sale at the time. Both tires perform amazingly well both on and off the track with an on-track advantage for the Bridgestones and an on-road advantage for the Michelins.

Current fleet:
1957 Jamaican bodied MGA
1958 MGA Twin Cam (race car)
1962 MGA Deluxe Coupe
1971 Jensen Interceptor
2009 Pontiac Solstice GXP Coupe
2007 BMW Z4M coupe
Recently departed: 1965 Jensen CV8, 1969 Lamborghini Islero S, 1988 Pontiac Fiero GT, 1969 MGC roadster
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Last edited by wspohn; 02-13-2017 at 08:21 AM.
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post #11 of 18 (permalink) Old 02-14-2017, 08:16 AM
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Quote:
Originally Posted by stuck View Post
Been running 255s for years with 0 issues. The only thing is that it throws the speedo off 3-4 mph. Didn't stagger them, though.
What the aspect ratio on the tires? 4-5MPH at what speed?

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post #12 of 18 (permalink) Old 02-14-2017, 08:30 AM
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Stock tires have a diameter of 26.7"
255x45s have a diameter of 27" so off by 1.1%, not bad

Current fleet:
1957 Jamaican bodied MGA
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1962 MGA Deluxe Coupe
1971 Jensen Interceptor
2009 Pontiac Solstice GXP Coupe
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Mods at https://www.solsticeforum.com/forum/f...thread-102178/

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post #13 of 18 (permalink) Old 02-14-2017, 08:46 AM
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...4-5MPH at what speed?
Since DDM has my car, I can't give you a break down at different speeds, but at 70, it's about 3 miles off from my Garmin.

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post #14 of 18 (permalink) Old 02-14-2017, 10:05 AM
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Quote:
Originally Posted by stuck View Post
Since DDM has my car, I can't give you a break down at different speeds, but at 70, it's about 3 miles off from my Garmin.
My box stock 2006 NA is always 3-4 mph faster than the speedo, regardless of speed. If the speedo says 45, the real speed is 48. If the speedo reads 75, I'm probably doing 78.

I discovered this before I had a GPS device, and the GPS confirms the real speed.

It's just another of those things that makes my Solstice unique!



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Last edited by DaveOC; 02-27-2017 at 03:34 PM.
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post #15 of 18 (permalink) Old 06-02-2017, 10:32 PM
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Quote:
Originally Posted by A.J.V View Post
From what I've learned while researching tire size if it fits on the back, you'll have no trouble fitting it in the front. Most will suggest a square setup (same size front and back) because you can still rotate, and it will keep the performance balanced. I went with a staggered setup because I wanted that look. I have 275's in the rear and 245's in the front.
AVJ, what are your wheel sizes including offset?

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