Stock tires - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85/Silverado · 08-26-2020, 09:23 PM

anyone know stock tire size for a 86 c10 .... rlms are 15 x 7 ?

geezer#99 · 08-26-2020, 10:15 PM

Tire rack says 225 or 235 75 15’s.

https://www.tirerack.com/tires/Selec...6&autoModClar=

85/Silverado · 08-26-2020, 11:02 PM

Cool thanks

1976gmc20 · 08-27-2020, 04:42 PM

I don't know exactly what came on them in 1986, but it seems like my 1980 K/10 had something like H78-15.

So those tire rack options could be replacement tire sizes.

I had P225/70R15 on my Jeep and when I ruined one this year they couldn't get a replacement. So they "gave" me four LT235/75R15 under warranty, but I had to pay for a new spare along with mounting and new warranty. Nice upgrade except they rub on the lower control arms on a tight turn.

85/Silverado · 08-27-2020, 10:54 PM

I ordered 2 235/75R15 tires now I need 4 15x8 rims. I could only find a 15x7 at the junk yard for 85 bucks and it was White. No one has inexpensive wheel on line.

geezer#99 · 08-28-2020, 08:11 AM

You don’t need 8 inch rims for 235 tires.
I assume that’s what you’re thinking.

85/Silverado · 08-28-2020, 08:54 AM

I removed the spare that's been under my 85 silverado for 30 years and the rim was 8" and it looks like the stock rim, But the rim was rusted too bad from water getting inside because it was Flat for years I guess.
Is there a Off Set for square body trucks?

geezer#99 · 08-28-2020, 10:20 AM

The stock 15x7’s on my 84 were 4 inch backspacing. No offset.
15x8’s are usually same backspace but would have an offset of 1 inch.

I used some newer ss454 rims on my 84. They were 15x7 with 4 inch bs.

donw1986 · 08-29-2020, 04:26 AM

My 86 came with 15x7 with 225/75 x15, bought it brand new in 86

**Desert1957** · 08-29-2020, 08:28 AM

15 X 6 on my 87 R10

85/Silverado · 08-29-2020, 11:30 AM

I talked to the original owned he said the spare is one of the original wheels They sure look alot bigger than the 7" rim.

Axle · 08-29-2020, 11:54 AM

15x8's where around as well.

Pontiac1976 · 08-29-2020, 12:19 PM

Those are Factory 15x8 5x5 bolt space Rally. I be leave they make reproduction rims that was few yr back now. 15x7 where mostly the norm as 15x8 was a option up grade. Unless dealer order that that way to sell. Try board members or locals car & truck club e-bay or other local parts in your area. Spare were Black, but must of wheel set where gray or sliver the Rally's. There starting to be had to find good OEM set now. A lot set now pretty rusty need to sand blasted a lot to clean them lots time/work to them looking good again. There is marking on the rim on the face near the valve or the back not to far away valve if the rust is not thick or there not to much paint on the rims say 15x8 or 15x7 or 15x6 some time there under the tire tread.

**Palf70Step** · 08-30-2020, 07:56 AM

Most with factory steel wheels, which I think were 6 or 6.5 inch wide came with FR78 for the size. Depending on who's scale you look at, it is normally a 205/78x15 for the size. Most folks run the 225 or 235 in 75 series which is just a hair taller, which is about the size when they used the 8" wide rally wheels.( GR78 I believe for back then)

72c20customcamper · 08-30-2020, 09:08 AM

The spare is a rally wheel . I bought a set from Specialk for my burban ,sold the burban same day I picked up the rims . Staggered set 15x7 and 15x8 most likely going on my 68 when I convert to disc and 5 lug

85/Silverado · 08-30-2020, 10:09 AM

Found a photo from when I bought the truck. Wish I still had the wheels.

Pontiac1976 · 08-31-2020, 07:17 PM

A break downhttps://tireguides.com/TireTips/TireDocument/4

**Corts60** · 08-31-2020, 07:49 PM

My '86 suburban came with factory 8" rally's and P235/75R15XL tires. I assume that XL back in the day is the predecessor to LT tires today.

SPID attached showing the option.

aggie91 · 09-01-2020, 11:16 AM

The 86 I just bought shows a P195/75R15 as the stock tire size on the SPID. Pretty sure the stock rims for these where 15"x5.5" with a 10.125" hub cap. Those are missing now from the truck. But I have a full set I can put on if I decide to go that way.

The truck has either 225 or 235 75R15's on it now with '88 up style truck rally wheels also missing the center caps and trim rings..

1976gmc20 · 09-01-2020, 01:58 PM

Quote:

Originally Posted by Corts60

My '86 suburban came with factory 8" rally's and P235/75R15XL tires. I assume that XL back in the day is the predecessor to LT tires today.

P means passenger. I dunno what XL means but there were light truck tires long long before there was a P or LT designation, and before radial tires.

We were running 7.00-15 6 ply truck tires on our half ton way back in the 1960s (after the piss poor passenger tires that it came with blew out).

Rich84 · 09-01-2020, 03:15 PM

Quote:

Originally Posted by aggie91

The truck has either 225 or 235 75R15's on it now with '88 up style truck rally wheels also missing the center caps and trim rings..

Do you know what size the '88 and up wheels are.. 7 or 8?

**Palf70Step** · 09-01-2020, 03:19 PM

GM did not make 8" wide wheel after 87....widest 15 are the 7" alloys. Steels I believe were all 6.5 (on the 1500 models)

sweetk30 · 09-01-2020, 04:34 PM

i have only seen 7" or 8" wide on the trucks my self up here in the north east . i have prob 2 full sets of decent 15x8" GM rims .

i just started doing up rims for my c-10 short bed build . i did 2 6.5" from a G-series van for the front with 235/70/15 and 255/70/15 rear on 8" wide and it gives it a nice staggered look .

here is the look i have going and last pic of the center cap and lug cover combo i picked .

and fyi my whole truck is down 2.5" from stock height . just to give you a size reference .

75C10 · 09-02-2020, 01:54 AM

Quote:

Originally Posted by aggie91

The 86 I just bought shows a P195/75R15 as the stock tire size on the SPID. Pretty sure the stock rims for these where 15"x5.5" with a 10.125" hub cap. Those are missing now from the truck. But I have a full set I can put on if I decide to go that way.

The truck has either 225 or 235 75R15's on it now with '88 up style truck rally wheels also missing the center caps and trim rings..

And I thought people that ran a P215/75-15 were using too light a tire for a truck but a P195! Wow! Most trucks in the 70 / 80’s using the passenger tire were P235 /78 on an 8” rally wheel. Must of been the area I lived. Now I am finding 7” rally wheels all over with very few 8”. Occasionally I find an 8” in pick n pull.

**hatzie** · 09-02-2020, 08:02 AM

I always ran 235/75R15's on the 1/2 tons and 265/75R16 on the 3/4 tons.
Most of my 1/2 tons came with 215/75R15's and 245/75R16's on the 3/4 tons.

IIRC I ran 235's on my 1968 IH Scout 800 back in the 80's with no issues.

08-26-2020, 09:23 PM	#1
85/Silverado Registered User Join Date: Nov 2011 Location: Port St. Joe Fl. Posts: 491	Stock tires anyone know stock tire size for a 86 c10 .... rlms are 15 x 7 ? __________________ 85 Silverado LWB Fleetside 383 Stroker 86 Custom Deluxe SWB, Pro Street LSX

08-26-2020, 10:15 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: Stock tires Tire rack says 225 or 235 75 15’s. https://www.tirerack.com/tires/Selec...6&autoModClar=

08-26-2020, 11:02 PM	#3
85/Silverado Registered User Join Date: Nov 2011 Location: Port St. Joe Fl. Posts: 491	Re: Stock tires Cool thanks __________________ 85 Silverado LWB Fleetside 383 Stroker 86 Custom Deluxe SWB, Pro Street LSX

08-27-2020, 04:42 PM	#4
1976gmc20 Registered User Join Date: May 2015 Location: Montana Posts: 3,696	Re: Stock tires I don't know exactly what came on them in 1986, but it seems like my 1980 K/10 had something like H78-15. So those tire rack options could be replacement tire sizes. I had P225/70R15 on my Jeep and when I ruined one this year they couldn't get a replacement. So they "gave" me four LT235/75R15 under warranty, but I had to pay for a new spare along with mounting and new warranty. Nice upgrade except they rub on the lower control arms on a tight turn. __________________ Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner

08-27-2020, 10:54 PM	#5
85/Silverado Registered User Join Date: Nov 2011 Location: Port St. Joe Fl. Posts: 491	Re: Stock tires I ordered 2 235/75R15 tires now I need 4 15x8 rims. I could only find a 15x7 at the junk yard for 85 bucks and it was White. No one has inexpensive wheel on line. __________________ 85 Silverado LWB Fleetside 383 Stroker 86 Custom Deluxe SWB, Pro Street LSX

08-28-2020, 08:11 AM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: Stock tires You don’t need 8 inch rims for 235 tires. I assume that’s what you’re thinking.

08-28-2020, 08:54 AM	#7
85/Silverado Registered User Join Date: Nov 2011 Location: Port St. Joe Fl. Posts: 491	Re: Stock tires I removed the spare that's been under my 85 silverado for 30 years and the rim was 8" and it looks like the stock rim, But the rim was rusted too bad from water getting inside because it was Flat for years I guess. Is there a Off Set for square body trucks? __________________ 85 Silverado LWB Fleetside 383 Stroker 86 Custom Deluxe SWB, Pro Street LSX

08-28-2020, 10:20 AM	#8
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: Stock tires The stock 15x7’s on my 84 were 4 inch backspacing. No offset. 15x8’s are usually same backspace but would have an offset of 1 inch. I used some newer ss454 rims on my 84. They were 15x7 with 4 inch bs.

08-29-2020, 04:26 AM	#9
donw1986 Registered User Join Date: Oct 2012 Location: Santa Clarita CA Posts: 79	Re: Stock tires My 86 came with 15x7 with 225/75 x15, bought it brand new in 86

08-29-2020, 08:28 AM	#10
Desert1957 Registered User Join Date: Apr 2009 Location: New Freedom Pa. Posts: 1,335	Re: Stock tires 15 X 6 on my 87 R10 __________________ Desert

08-29-2020, 11:30 AM	#11
85/Silverado Registered User Join Date: Nov 2011 Location: Port St. Joe Fl. Posts: 491	Re: Stock tires I talked to the original owned he said the spare is one of the original wheels They sure look alot bigger than the 7" rim. Attached Images __________________ 85 Silverado LWB Fleetside 383 Stroker 86 Custom Deluxe SWB, Pro Street LSX

08-29-2020, 11:54 AM	#12
Axle Registered User Join Date: Jul 2011 Location: SW Ontario Posts: 1,199	Re: Stock tires 15x8's where around as well.

08-29-2020, 12:19 PM	#13
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 750	Re: Stock tires Those are Factory 15x8 5x5 bolt space Rally. I be leave they make reproduction rims that was few yr back now. 15x7 where mostly the norm as 15x8 was a option up grade. Unless dealer order that that way to sell. Try board members or locals car & truck club e-bay or other local parts in your area. Spare were Black, but must of wheel set where gray or sliver the Rally's. There starting to be had to find good OEM set now. A lot set now pretty rusty need to sand blasted a lot to clean them lots time/work to them looking good again. There is marking on the rim on the face near the valve or the back not to far away valve if the rust is not thick or there not to much paint on the rims say 15x8 or 15x7 or 15x6 some time there under the tire tread. __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

08-30-2020, 07:56 AM	#14
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,634	Re: Stock tires Most with factory steel wheels, which I think were 6 or 6.5 inch wide came with FR78 for the size. Depending on who's scale you look at, it is normally a 205/78x15 for the size. Most folks run the 225 or 235 in 75 series which is just a hair taller, which is about the size when they used the 8" wide rally wheels.( GR78 I believe for back then) __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

08-30-2020, 09:08 AM	#15
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 8,141	Re: Stock tires The spare is a rally wheel . I bought a set from Specialk for my burban ,sold the burban same day I picked up the rims . Staggered set 15x7 and 15x8 most likely going on my 68 when I convert to disc and 5 lug Attached Images __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.



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08-30-2020, 10:09 AM	#16
85/Silverado Registered User Join Date: Nov 2011 Location: Port St. Joe Fl. Posts: 491	Re: Stock tires Found a photo from when I bought the truck. Wish I still had the wheels. Attached Images __________________ 85 Silverado LWB Fleetside 383 Stroker 86 Custom Deluxe SWB, Pro Street LSX

08-31-2020, 07:17 PM	#17
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 750	Re: Stock tires A break downhttps://tireguides.com/TireTips/TireDocument/4 __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

08-31-2020, 07:49 PM	#18
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,672	Re: Stock tires My '86 suburban came with factory 8" rally's and P235/75R15XL tires. I assume that XL back in the day is the predecessor to LT tires today. SPID attached showing the option. Attached Images __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725

09-01-2020, 11:16 AM	#19
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: Stock tires The 86 I just bought shows a P195/75R15 as the stock tire size on the SPID. Pretty sure the stock rims for these where 15"x5.5" with a 10.125" hub cap. Those are missing now from the truck. But I have a full set I can put on if I decide to go that way. The truck has either 225 or 235 75R15's on it now with '88 up style truck rally wheels also missing the center caps and trim rings.. Attached Images __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square

09-01-2020, 03:19 PM	#22
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,634	Re: Stock tires GM did not make 8" wide wheel after 87....widest 15 are the 7" alloys. Steels I believe were all 6.5 (on the 1500 models) __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

09-01-2020, 04:34 PM	#23
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Stock tires i have only seen 7" or 8" wide on the trucks my self up here in the north east . i have prob 2 full sets of decent 15x8" GM rims . i just started doing up rims for my c-10 short bed build . i did 2 6.5" from a G-series van for the front with 235/70/15 and 255/70/15 rear on 8" wide and it gives it a nice staggered look . here is the look i have going and last pic of the center cap and lug cover combo i picked . and fyi my whole truck is down 2.5" from stock height . just to give you a size reference . Attached Images __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

09-02-2020, 08:02 AM	#25
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,913	Re: Stock tires I always ran 235/75R15's on the 1/2 tons and 265/75R16 on the 3/4 tons. Most of my 1/2 tons came with 215/75R15's and 245/75R16's on the 3/4 tons. IIRC I ran 235's on my 1968 IH Scout 800 back in the 80's with no issues. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

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