Factory Wheel and Tire Specifications - Chevy SSR Forum
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post #1 of 15 (permalink) Old 05-28-2018, 11:33 AM Thread Starter
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Factory Wheel and Tire Specifications

Because the specifications on the OEM wheels and tires are not neatly organized in one location, here is a summary that I complied that can be used for reference. Credit for the diagrams to www.autoanything.com

Wheel Offset:
The SSR has positive offset on both front and rear wheels
This means that the mounting face of the hub is offset towards the outside of the truck relative to the centerline of the wheel (most current factory wheels have some positive offset)
Wheel Backspacing:
The distance from the back face of the mounting hub to the rear of the wheel (with a straightedge across the rear flange)

Front Wheels
Size= 8J19xET32
Stamped 19x8.0Jx32
Wheel Diameter= 19 inches
Wheel width measured inside the flanges= 8.0 inches
J= Wheel Mounting Flange Style
32 or ET 32= 32mm positive offset
ET=Einpresstiefe or offset
Backspacing= 5-3/4 inches
Hub (Center Bore) Pitch Circle Diameter= 78.3 mm
Bolt Pattern=6 (Lugs) x 127mm (Bolt Circle Diameter)
Bolt Threads= M12x1.5

Rear Wheels
Size= 10Jx20ET14
Stamped 20x10Jx14
Wheel Diameter= 20 inches
Wheel width measured inside the flanges= 10 inches
J= Wheel Mounting Flange Style
14 or ET14= 14mm positive offset
ET=Einpresstiefe or offset
Backspacing= 6-1/8 inches
Hub (Center Bore) Pitch Circle Diameter= 78.3mm
Bolt Pattern=6 (Lugs) x 127mm (Bolt Circle Diameter)
Bolt Threads= M12x1.5


Goodyear Eagle RS-A OEM Tire Specifications

Front Tires
Size: P255-45R19
Load Rating: 100H
Maximum Load: 1764 pounds
GM Tire Performance Criteria (TPC Spec): 1221MS
Tire Inflation Pressure (cold): 30psi
UTQ Grade: 260AA
Outside Diameter: 28.1 inches
Section Width: 10.0 inches
Revolutions/Mile: 745


Rear Tires
Size: P295-40R20
Load Rating: 106H
Maximum Load: 2094 pounds
GM Tire Performance Criteria (TPC Spec): 1222MS
Tire Inflation Pressure (cold): 30psi
UTQ Grade: 260AA
Outside Diameter: 29.3 inches
Section Width: 11.7 inches
Revolutions/Mile: 714
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post #2 of 15 (permalink) Old 05-28-2018, 02:33 PM
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My SSR:
'06 FPR #23615 ______ DOB 02.28.06
Garage
Itís been posted before in the forums that the backspacing is as below:

Front 19 x 8, 6 on 5" boltpattern, 5 3/4 backsspace

Rear 20 x 10, 6 on 5" boltpattern, 6 1/8 backspace

Just curious where you got your numbers?

Rope
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post #3 of 15 (permalink) Old 05-28-2018, 03:20 PM Thread Starter
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Backspacing

Quote:
Originally Posted by RDSTR42 View Post
Itís been posted before in the forums that the backspacing is as below:

Front 19 x 8, 6 on 5" boltpattern, 5 3/4 backsspace

Rear 20 x 10, 6 on 5" boltpattern, 6 1/8 backspace

Just curious where you got your numbers?

Rope
Kerry:

I found them in a table but based on your note I measured two wheels with metal straightedges, confirmed your numbers, and updated the post.

Thanks.
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post #4 of 15 (permalink) Old 05-28-2018, 03:54 PM
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My SSR:
'06 FPR #23615 ______ DOB 02.28.06
Garage
snomuncher

Another useful specification you may want to add to your post is outside diameter (in) for tires? Based on Goodyear specifications being they were OEM are:

Front: 28.1”
Rear: 29.3”

Rope
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post #5 of 15 (permalink) Old 05-28-2018, 04:02 PM
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My SSR:
05 Slingshot Yellow,Built 1-24-05,VIN120035,INDY500 Track/Festival/Parade Truck #32 of 74
Another good reason for max performance, handling and tracking, stick with the stock wheels and tires the SSR was built around. Just my 2 cents and we all know what that is worth.


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God Bless and Keep on Truckin,
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post #6 of 15 (permalink) Old 05-28-2018, 05:16 PM Thread Starter
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Tire Specs

Quote:
Originally Posted by RDSTR42 View Post
snomuncher

Another useful specification you may want to add to your post is outside diameter (in) for tires? Based on Goodyear specifications being they were OEM are:

Front: 28.1”
Rear: 29.3”

Rope
I was working on expanding the tire specs (no pun intended) and have updated the info to include the ODs and more. There is a conflict between the Goodyear site and what is listed on a pair of front tires I have- the speed rating is listed as "H" on the front tires and "V" on the spec page. I have listed what is on my tires, which is also consistent with other information about the original load rating.
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post #7 of 15 (permalink) Old 10-25-2018, 09:42 PM
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Hi,

Thank you for the posted information.

I was trying to put old school style white wall tire with baby moon center cap on my 2006 SSR.

I went to wheelvintiques.com in city of industry, CA but advised to get the numbers of wheel spec.

I could not find the followings,

inside knob fit
outside knob fit
brake sizes


Need help!

Steve
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post #8 of 15 (permalink) Old 10-25-2018, 11:12 PM
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My SSR:
'06- Silver/Copper- 121421
You need an 18 inch rim (some 17 inch will work) to clear the brakes.
No idea what knob fit is unless they are talking about those little bumps steel rims used to hold hubcaps on.
SSR rims don't have them and the front and rear hubcaps are different sizes.

Often wrong...... but never in doubt.
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post #9 of 15 (permalink) Old 10-26-2018, 06:18 AM
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My SSR:
2005 6 spd. BLACK
Let us know

ddmsteve

Please let us know if you find the wheels and tires. I am considering the same thing.

Dave
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post #10 of 15 (permalink) Old 10-26-2018, 08:12 PM Thread Starter
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Quote:
Originally Posted by ddmsteve View Post
Hi,

Thank you for the posted information.

I was trying to put old school style white wall tire with baby moon center cap on my 2006 SSR.

I went to wheelvintiques.com in city of industry, CA but advised to get the numbers of wheel spec.

I could not find the followings,

inside knob fit
outside knob fit
brake sizes


Need help!

Steve

After looking at some Wheel Vintiques information I believe Bruce is correct. The inside and outside "knob fits" are related to the "nubs" that are used to retain either a full hubcap or trim ring or a smaller center cap. Because OEM SSR wheels do not use trim rings or hubcaps these dimensions are not available. I'd recommend discussing with the manufacturer what trim ring or cap you want to install on the wheel style and size you select and ask their suggestions for these dimensions. Relative to brake size, there are online templates and guides available for measuring wheel clearance and brake sizes.
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post #11 of 15 (permalink) Old 10-26-2018, 10:14 PM
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certainly!
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post #12 of 15 (permalink) Old 10-26-2018, 10:15 PM
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Thank you!!!

Now, I will visit wheelvintiques.com again next week. I will post the result!

Thank again!

Steve
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post #13 of 15 (permalink) Old 11-09-2018, 07:26 PM
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Another troubles

I went to the shop, and they gave me another homework.

I need to get the length of A, B, and C.
Also, I need to get the length of X and Y.

Can anyone help?

Thanks,

Steve
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post #14 of 15 (permalink) Old 11-09-2018, 10:53 PM
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My SSR:
'06- Silver/Copper- 121421
They are jerking you around because they feel you don't know what you're doing, and are likely to screw up and blame them.

They need the diameter, width, backspacing and bolt pattern. They should also know the size of your lugs and the center bore you need.

Often wrong...... but never in doubt.
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post #15 of 15 (permalink) Old 11-16-2018, 08:48 PM
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Bruce,

Thank you for the words.

They probably have the information in hand and keep fooling me around.

I just do not know where I should be expecting some useful help.
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