Tires - Chevy SSR Forum
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post #1 of 2 (permalink) Old 04-17-2008, 12:31 PM Thread Starter
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Join Date: Mar 2003
Location: Sicklerville, NJ
Posts: 10,950


My SSR:
Black, '03, 1sb, #1256 and '05
Tires

All SSRs came from the factory with Goodyear Eagle RS-A, High Performance, All-Season tires. The fronts are 255/45HR19 and the rears are 295/40HR20. The recommended tire pressure is 30lbs. With a good alignment, the tires will last over 40,000 miles. These are the ONLY brand of tires of this size and load rating that are rated for snow.

Two things to look for in your tire wear:
1) Inside wear on front tires. Many people have reported that the very inside of the front tires had worn down to the chord without them noticing. This was due to a camber/toe that was in spec, but not an optimal setting for longer tread wear.
2) The center of the rear tires wear faster than the rest of the tire.
3) Since these are big rims, getting a Road Force balance on the tires may help more than a regular balance.

Alignment Specs:

Caster
4.25 deg +/- 0.60 deg.
Cross caster (L-R) 0.00 +/- 0.60 deg

Camber
-0.50 deg +/- 0.60 deg
Cross camber (L-R) 0.00 +/- 0.60 deg

Total Toe
0.10 deg +/- 0.20 deg.

*If you are more concerned with tire wear than performance and you don't drive it hard around the corners, you can have them set the camber close 0.00 (still within factory specs).


For those who are not familiar with tire nomenclature, using the 255/45HR19 100H tire as an example. The 255 is the tire width in millimeters (25.4 mm = 1 inch). The 45 is the “aspect ratio” defining the sidewall height as a percentage of the width, in this case 255 x 0.45 = 114 mm = 4.5 in. The "H" is the speed rating, which means this tire is rated for speeds up to 130 mph. The "R" stands for radial. The 19 is the diameter of the wheel in inches. And the 100 is the load rating of the tire, which means this tire is rated for 1764 lbs.

Speed ratings are as follows:
Q- Up to 100mph.. U- Up to 124mph.. W- Up to 168mph
R- Up to 106mph.. H- Up to 130mph.. Y- Up to 186mph
S- Up to 112mph.. V- Up to 149mph.. Z- 149mph and over
T- Up to 118mph

Load ratings are as follows (in lbs.)*:
95 1521.. 100 1764.. 105 2039.. 110 2337
96 1565.. 101 1819.. 106 2094
97 1609.. 102 1874.. 107 2149
98 1653.. 103 1929.. 108 2205
99 1709.. 104 1984.. 109 2271
* There are more just not included here.

For those who are not familiar with wheel nomenclature, “backspace” is the distance from the backside of the wheel mounting pad to the inside edge of the wheel. “Offset” is the distance from the backside of the wheel mounting pad to the centerline of the wheel width. A “positive offset” means that the mounting pad is located outside of the centerline of the wheel, and a “negative offset” means that the mounting pad is located inside of the centerline of the wheel.

The information on our stock SSR wheels and tires is as follows:
Wheel ...............Backspace Offset......Sidewall Ht.. Tire Outer Diameter
Front: 19”x8”..... 5-3/4”...... +1-3/4”.. 4.518”......... 28.035”
Rear: 20”x10”..... 6-1/8”...... +1-1/8”.. 4.646”........ 29.291”
Note: all wheels have 6 lugs on 5" (127 mm) circle pattern.

From the Driver's Manual:
If a Tire Goes Flat, your vehicle has no spare tire, no tire changing equipment and no place to store a tire.
It’s unusual for a tire to “blow out” while you’re driving, especially if you maintain your tires properly. If air goes out of a tire, it’s much more likely to leak out slowly. But if you should ever have a “blow out” here are a few tips about what to expect and what to do:
If a front tire fails, the flat tire will create a drag that pulls the vehicle toward that side. Take your foot off the accelerator pedal and grip the steering wheel firmly. Steer to maintain lane position, and then gently brake to a stop well out of the traffic lane. A rear blow out, particularly on a curve, acts much like a skid and may require the same correction you’d use in a skid. In any rear blow out, remove your foot from the accelerator pedal. Get the vehicle under control by steering the way you want the vehicle to go. It may be very bumpy and noisy, but you can still steer. Gently brake to a stop, well off the road if possible. If a tire goes flat, avoid further tire and wheel damage by driving slowly to a level place and stopping.
1. Turn on the hazard warning flashers.
2. Set the parking brake firmly.
3. Put the shift lever in PARK (P).
4. Turn off the engine.
5. Inspect the flat tire.
If the tire has been separated from the wheel or has damaged sidewalls or large tears that allow rapid air loss, call a tire repair facility. If the flat tire is due to a slow leak caused by a nail or other similar road hazard, the tire inflator kit may be used to repair the damaged tire temporarily. The kit uses a liquid tire sealant to seal small punctures in the tread area of the tire. The flat tire is then inflated to at least 26 psi (179 kPa) and driven to evenly distribute the tire sealant. The tire pressure is checked after driving for a maximum of 10 minutes to see if the slow leak has been stopped. If the tire pressure is 19 psi (131 kPa) or more, inflate the tire up to the standard operating pressure as shown on the tire and loading information label found on center pillar near the door latch or on the rear edge of the driver’s door.
You should have the damaged tire repaired as soon as possible. The tire sealant is a temporary repair only.
Notice: If the tire pressure has dropped below 19 psi (131 kPa), the vehicle should not be driven. Damage to the tire may be severe and the sealant will not be effective.


TIRE SPECS:



Another tire with the exact SAME dimensions:

(*These tires not rated for snow)


Other sets of tires with DIFFERENT dimensions:
(when using different dimension rear tires, your speedometer may be affected)


(*Load rating on front tires lower than OEM. These tires not rated for snow)







(*These tires not rated for snow)



(*These tires not rated for snow)


(*These tires not rated for snow)

Pirelli has some tires that will fit, but no specs on their website.


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post #2 of 2 (permalink) Old 06-01-2010, 07:39 AM Thread Starter
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Join Date: Mar 2003
Location: Sicklerville, NJ
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My SSR:
Black, '03, 1sb, #1256 and '05
Here is a worksheet created by js73751 5/28/10
Attached Files
File Type: pdf Tires .pdf (102.6 KB, 823 views)
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