Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Stock tire size?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by COLLISION, Jun 1, 2002.

  1. COLLISION

    COLLISION 1/2 ton status

    Joined:
    May 15, 2002
    Posts:
    175
    Likes Received:
    0
    Location:
    Kelowna,British Columbia
    Anyone remember what the stock tire size was for 87-89 bare bones blazers?
    I changed mine six years ago and I think they were 205/75/r15
    I'm trying to use that diff ratio calculator to figure out a good all round gear ratio.
    Currently running 32 BFG A/T with 3.07
    Swapping to 3/4 ton gear 4" lift and 35's on 3.73's
    I noticed that the 32's gave me pretty good fuel economy but were a little weak on steep off road for low end torque with 3.07 gears.
    Blah Blah Blah, I know the subject has been discussed alot but searching through previous posts has not helped.

    http://community.webshots.com/user/sone4120
     
  2. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

    Joined:
    May 19, 2001
    Posts:
    45,030
    Likes Received:
    365
    Location:
    Vancouver, WA, USA
    my 85 had 31x10.5s... towing package w/ 3.73 gears...

    J
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    235/75R15's stock or 31x10.5R15's optional IIRC.
     
  4. XHitman396

    XHitman396 1/2 ton status

    Joined:
    May 3, 2002
    Posts:
    620
    Likes Received:
    0
    Location:
    Broken Arrow, Oklahoma
    gotta bone stock 87 with 31X10.5 on the alloys, BTW on the driver side door, open it and look and see if there's a sticker right above the latching mechanism, that has a lot of my specs on it. and what are the stock rim size for alloys on an 87?

    Brett
     
  5. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

    Joined:
    May 19, 2001
    Posts:
    45,030
    Likes Received:
    365
    Location:
    Vancouver, WA, USA
    or there is always the label inside the glove box...

    J
     
  6. COLLISION

    COLLISION 1/2 ton status

    Joined:
    May 15, 2002
    Posts:
    175
    Likes Received:
    0
    Location:
    Kelowna,British Columbia
    Thanks for the info,
    I removed the door sticker when i changed the colour on the truck several years back
     
  7. Blazinaire

    Blazinaire 1/2 ton status

    Joined:
    Mar 17, 2002
    Posts:
    1,262
    Likes Received:
    0
    Location:
    Santa Maria, CA
    I have the original full sized spare in my '87 and it is a 31x10.5.
     
  8. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    What was the biggest/tallest tire size offered from the factory on 4wd Chevy?Legally I can go 2" over on tallest factory size.Currently my registration card says that I can use 33x12.50 tyres.Am I stuck on that size or is there any hope to get taller tyres?
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    Have never heard anything larger than 31x10.5R15 for the K5's, sorry, if thats what you are asking. The actual trucks had different sizes available (because of the different size wheels) bu I don't know those off the top of my head.

    It COULD be that for export to some countries, larger tiers could have been spec'd, but at least in the "standard" tire sizes back in 1980, I would be surprised if even 32x11.5R15's were available in a tire store.
     
  10. wrathORC

    wrathORC 1/2 ton status

    Joined:
    Apr 27, 2002
    Posts:
    908
    Likes Received:
    0
    Location:
    Hancock, MI
    Stock for that generation was 235x75r15 or on a 3/4 ton or 1 ton 245x75r16. On the off-road models (they actually had a Z71 kind of package but the truck was called something weird instead) they got 31x10.50r15s. My Dad told me almost all the Big 10s came with 31x10.50s. 31x10.50r15s were available on 1/2 tons, K5s, and Suburbans. Anything with a 16" wheel almost always came with 245x75r16. However, my 77 3/4 ton came with 31x10.50x16 Bias Plys.


    As a side note, I'm perfectly happy with my 3.42s and 33s. 3.73s would be ideal but I couldn't find axles with 3.73s in them. I originally had 2.73s.
     
  11. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    [ QUOTE ]
    Have never heard anything larger than 31x10.5R15 for the K5's, sorry, if thats what you are asking. The actual trucks had different sizes available (because of the different size wheels) bu I don't know those off the top of my head.

    It COULD be that for export to some countries, larger tiers could have been spec'd, but at least in the "standard" tire sizes back in 1980, I would be surprised if even 32x11.5R15's were available in a tire store.

    [/ QUOTE ]

    Thanks for the info.Basically any truck will do,it doesn't have to be K5.I was thinking that maybe K30 would have bigger tyres than K5?
     
  12. MA87K5

    MA87K5 1/2 ton status

    Joined:
    Apr 6, 2000
    Posts:
    558
    Likes Received:
    0
    Location:
    Chicopee, Ma 01020
    I have the sale catolog for the 1987 K5 Blazer, and the standard size tire was P215/75R-15.
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    You sure thats not 235x75R15?

    A 215 would be a pretty small tire even compared to the 235. Even if it is in your literature, I'm almost betting it was a misprint. ??
     
  14. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,958
    Likes Received:
    452
    Location:
    East of San Francisco
    Dorian, scary though it seems, *base-model* stock tires were tiny little things. 1987 indeed lists 215-75-15's... see

    The Brochures page

    1986 lists the same size, which is ... huh ... 8.5" wide tread, <28" tire... sounds right. Stock on my '74 was L78-15 or somesuch, tiny little guys and that's on the "big" 4WD version /forums/images/graemlins/smile.gif
     
  15. 87BrnRsd

    87BrnRsd 1/2 ton status

    Joined:
    Apr 21, 2003
    Posts:
    2,457
    Likes Received:
    0
    Location:
    Boone, North Carolina
    In the glovebox of my truck, it says as an option that it came with p235 75 r15. That is stock on my 87.
    -Harrison
     
  16. mud390

    mud390 1/2 ton status

    Joined:
    Oct 31, 2002
    Posts:
    1,210
    Likes Received:
    0
    Location:
    Little Rock, Arkansas
    My 84 K5 says 235/75r/15. Thats on the door sticker. I think the PSI is 30 or 35.

    Kris
     
  17. COLLISION

    COLLISION 1/2 ton status

    Joined:
    May 15, 2002
    Posts:
    175
    Likes Received:
    0
    Location:
    Kelowna,British Columbia
    Thanks for the info but I think 4x4 76 dug this post up and asked the latest question, my original post was from over a year ago.
    /forums/images/graemlins/smile.gif
     
  18. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    My 1 ton 2wd had 245/75R16s stock

    1 ton 4x4 had 235/85R16s which I believe was an option

    K10 had 235/75R15s

    I've never seen 215s on a 4x4, but I'm sure it's possible. I have seen 205s and 215s on 2wd trucks. I too have seen 31x10.50 stock, even with 3.08 geared trucks and overdrive.
     
  19. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    Thanks guys /forums/images/graemlins/thumb.gif So it seems that I'm stuck with what I have.But thats ok,only that I have to take trailer and bigger tyres on that if I ever go to an off-road trip to somewhere far.
    Back on original plan that I had.I buy set of 35"-36" Boggers after I get my 14-bolt under my truck and use them only on longer off-road trips.

    [ QUOTE ]
    Dorian, scary though it seems, *base-model* stock tires were tiny little things. 1987 indeed lists 215-75-15's... see

    The Brochures page

    1986 lists the same size, which is ... huh ... 8.5" wide tread, <28" tire... sounds right. Stock on my '74 was L78-15 or somesuch, tiny little guys and that's on the "big" 4WD version


    [/ QUOTE ]

    Reminds me when I went on my first real off-road trip 2 weeks ago.There were guys driving Toyotas w/35" and bigger M/T's and Boggers.
    They were looking at my K5 that currently has 31" A/T's under it and laughing "You sure you want go with those tyres?"
    I did and showed how to drive big truck with small tyres.They gave me an applause when I drove trough one tight place with ease where one FJ-40 had trouble with 35".
    Of course I had a good spotter /forums/images/graemlins/thumb.gif
     
  20. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    Yeah that is scary. More than one year that is listed. I guess it's a good thing that wasn't very common (apparently). Then I couldn't complain about the new Dodges and their tiny tires.
     

Share This Page