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  1. #1
    Jr. Mechanic AzDragonLord's Avatar
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    Default New Tires...Old Spare

    I expect my factory P245/70R-17 tires to need replacing within the next year, and I'm entertaining the idea of getting a slightly larger tire (the Hankooks here). Would I be able to keep and use the original spare even though it's slightly smaller? I know I shouldnt' mix tire sizes, but if it's for "limited use only", I could save some serious $$ by not buying a 5th tire.

    ================================================== =======
    2009 GMC Sierra 1500 WT with ... DU-HA underseat storage ; BAKFLIP G2 bed cover ;
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  2. #2
    Jr. Mechanic AzDragonLord's Avatar
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    Default

    Nobody knows if that small difference in tire size will be an issue?

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    2009 GMC Sierra 1500 WT with ... DU-HA underseat storage ; BAKFLIP G2 bed cover ;
    Rostra Cruise Control

  3. #3
    Legend Bigbomber's Avatar
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    Default

    I can't see why it would be a problem,you see cars with those donut spares on all the time.As long as you fix your tire quick ,i'm sure it's not going to do any damage to your truck.
    [/SIGPIC]2009 Chevy Silverado LT 1500 EXT CAB 4X4 Vortec 4.8L SFI,K&N air filter,Weathertech Floor Liners ,Weathertech Stone/Bug Deflector, Line X Spray On Bedliner, TruXport Rollup Tonneau Cover, Molded Mudguards, Viper 5701 LE 2 way Security Alarm/Remote Starter, Xm Satelite Radio,BILSTEIN 5100 rear shocks,BILSTEIN 5100 front levelling shocks,READYLIFT 2" rear lift blocks,Goodyear Wrangler Territorys -265/70R 17"

  4. #4

    Default

    If your truck has a rear locker than you can't mix the rear tires as they would be rotating at differant speeds. My '05 has a locker and when I got a flat tire I moved the right front to the rear and put the spare on the front (pain in the ass).

  5. #5
    Jr. Mechanic AzDragonLord's Avatar
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    I don't know if I do or not. What would happen if I did?

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    2009 GMC Sierra 1500 WT with ... DU-HA underseat storage ; BAKFLIP G2 bed cover ;
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  6. #6

    Default

    You could tear up the rear end because the rear is locked and the smaller tire is wanting to turn faster than the taller tire.

  7. #7

    Default

    as long as you run the spare on the front and dont put it into 4 wheel drive you will be fine. if you have a locker in the rear and run two different size tires you could brake a axel

  8. #8
    Jr. Mechanic AzDragonLord's Avatar
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    Default

    Well I don't want to break anything! I'll keep them all the same when the time comes.

    Thank you all.

    ================================================== =======
    2009 GMC Sierra 1500 WT with ... DU-HA underseat storage ; BAKFLIP G2 bed cover ;
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  9. #9

    Default

    When you buy your new tires buy a CHEAP tire for the spare, the same size as the others.

  10. #10
    Sr. Engineer
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    Default

    Quote Originally Posted by silveradotrailblazer View Post
    When you buy your new tires buy a CHEAP tire for the spare, the same size as the others.
    GREAT idea! I have the same concern. My spare has never hit the ground, wonder if they would swap for a good used one of the new size for the spare.
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

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