Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
10-17-2023, 04:25 AM | #1 |
Registered User
Join Date: Jul 2017
Location: Texas
Posts: 408
|
What was the factory tire size on 87?
I'm about to get new tires on my 87 2wd half ton silverado. But the tire shop seems a bit confused on what size would have been factory. I'm hoping someone here can tell me the size that would have come on the truck when it was new. It's just got the typical 15" rally wheels. Thank you
|
10-17-2023, 07:26 AM | #2 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Base was P195/75R15.
You could order up to P235/75R15. There also was an LR60-15B available within certain packages. K https://www.gm.com/content/dam/compa...olet-Truck.pdf
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 10-18-2023 at 10:19 AM. |
10-18-2023, 12:13 AM | #3 |
Registered User
Join Date: Jul 2017
Location: Texas
Posts: 408
|
Re: What was the factory tire size on 87?
Thank you sir
|
10-18-2023, 09:33 AM | #4 |
Registered User
Join Date: May 2005
Location: Mobile, Al
Posts: 92
|
Re: What was the factory tire size on 87?
There should be a sticker on the door with the original size and recommended psi. (not the VIN sticker)
__________________
John '91 Blazer, full top, bbc, 4spd, Doubler, 1 tons, 40's |
10-18-2023, 10:16 AM | #5 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Speaking of stickers: An optional tire will also appear on the SPID if you still have the label in the glovebox.
Tire RPOs are Xxx (front), Yxx (rear) and Zxx (spare). K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 10-19-2023 at 12:44 PM. |
10-19-2023, 10:36 PM | #6 |
Registered User
Join Date: Jul 2017
Location: Texas
Posts: 408
|
Re: What was the factory tire size on 87?
What are the characteristics of both these tire sizes? It would seem that the larger tire was considered to be an upgrade. Was there no advantage to the smaller tire?
|
10-19-2023, 11:42 PM | #7 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,583
|
Re: What was the factory tire size on 87?
Ride height and engine speed. Smaller tire = lower stance and faster engine RPMs. Larger tire = higher stance and lower engine RPMs. Also will impact the speedometer accuracy.
|
10-20-2023, 08:19 AM | #8 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Quote:
As a manufacturer you take the cheapest tire you can offer and use that as base. Any tire savings is multiplied by 5 (or by 4 for those vehicles that do not get a spare) so it adds up. Yes - the larger tire is an upgrade and therefore additional cost to the customer and more revenue for GM. Tire prices are shown in the info packet I linked; it cost me an additional $250 to opt up to the P235 tires on my '87. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 10-20-2023 at 08:27 AM. |
|
10-20-2023, 09:06 AM | #9 |
Registered User
Join Date: Dec 2012
Location: Pendleton, Indiana
Posts: 235
|
Re: What was the factory tire size on 87?
So if you opt for the larger tires what was done to correct speed and mileage?
|
10-20-2023, 10:41 AM | #10 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Quote:
In some cases an external adapter was also used, as in the case of my '87 (it used the "Z" shaped version). K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
|
10-20-2023, 11:13 AM | #11 | |
Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,044
|
Re: What was the factory tire size on 87?
Quote:
https://67-72chevytrucks.com/vboard/...d.php?t=845046 Page 42 of this PDF shows the different tire sizes that were available https://www.gm.com/content/dam/compa...olet-Truck.pdf
__________________
'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
|
10-20-2023, 11:47 AM | #12 | ||
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Quote:
The GVWR is established not only by how much weight the vehicle can carry, but also if you can get that weight moving and stopped. That includes rear axle ratio, too. When I was establishing GVW (and GCW) ratings the final capping run was if you could get the load moving up the 16% grade at the Milford Proving Ground from a standing stop. Quote:
K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 10-20-2023 at 11:52 AM. |
||
10-21-2023, 12:32 AM | #13 |
Registered User
Join Date: Jul 2017
Location: Texas
Posts: 408
|
Re: What was the factory tire size on 87?
According to that PDF, it looks like p225 and p235 tires were available. Or at least usable.
|
10-23-2023, 08:52 AM | #14 |
Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,208
|
Re: What was the factory tire size on 87?
What size tires have you got on it now that the tire shop is 'confused'?
|
10-23-2023, 05:36 PM | #15 | |
Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,975
|
Re: What was the factory tire size on 87?
Quote:
They're based on the axle rato, transmission/transfer-case, and tire size.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
|
10-24-2023, 02:00 AM | #16 | |
Registered User
Join Date: Jul 2017
Location: Texas
Posts: 408
|
Re: What was the factory tire size on 87?
Quote:
Also, anyone got any pics of other tire sizes on the stock 15" rally wheels? Minus all the off-roading tires. Just street tires. I wouldn't mind seeing some pics so I could choose the tires which look the best imo. 185 to 235 seems like a nice gap. Maybe 225 or 215 would look good. |
|
10-24-2023, 09:14 AM | #17 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Quote:
They didn't swap gears in the assembly plant. The transmissions were all built up, sitting there ready to go. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
|
10-24-2023, 09:16 AM | #18 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Quote:
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
|
10-24-2023, 09:17 AM | #19 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
Lr60-15
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
10-24-2023, 10:48 AM | #20 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,702
|
Re: What was the factory tire size on 87?
How wide were the rims with the p235’s, Kieth?
|
10-24-2023, 03:36 PM | #21 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
|
Re: What was the factory tire size on 87?
15 x 8 rallys.
K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
10-27-2023, 04:22 PM | #22 | |
Junior Member
Join Date: Jan 2023
Location: Beaumont
Posts: 60
|
Re: What was the factory tire size on 87?
Quote:
I thought I wanted blackwall and after the fresh paint job I purchased a complete set of the Goodyear Wranger Duratrac to get the Outlined white letter tires. I am not sure where you are in Texas but I am an hour out of Houston on the east side. |
|
11-04-2023, 08:36 AM | #23 | |
Registered User
Join Date: Jul 2017
Location: Texas
Posts: 408
|
Re: What was the factory tire size on 87?
Quote:
|
|
Bookmarks |
|
|