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  1. #1

    Default Tire size fitment question

    hi i have a 2003 lifted chevy truck with a 6 in superlift and 3 in body lift, i need new tires and was wondering if a 37 14.50 would fit under it without rubbing. i have 35 12.50's on it now my wheels are 10 in wide. need some advice.
    thanks

  2. #2

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    Welcome!

    I'd expect you'd have to trim. However, that's just a suspicion, as I've not dealt with tires that large, before. By the way, I seriously hope you're changing your gear ratios as you're moving up (so that your truck maintains some low-end grunt instead of becoming a dog) and that this is on a 2500 HD or better and not a 10-bolt 1500! (I'd be worried about the rear diff on a 1500 and also concerned about snapped axles on a 1500...)

  3. #3

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    The truck is a 1500 with stock gears and axles, there's 186k on the truck now and hasn't had any problems as far as axles go, thanks for the help

  4. #4
    Jr. Apprentice weswins's Avatar
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    Default

    Hey, I work at a truck accessory shop and can tell you without a shadow of a doubt that those tires WILL RUB.
    This being said, they will rub on the rear of the splash guards on the front wheel wells and a small amount on the front bumper. If you do not trim these parts, your tires will quickly take care of that for you the first time you head offroad.
    As far as axles, drive it nicely, dont try burnouts on dry pavement and dont expect much longevity on hardware if you wheel it offroad.

    After all that, do it and enjoy it, there isnt much harm you can do in upsizing tires after 35's, the stress is already there.
    Full throttle is never enough!
    1994 Silverado Z71 1500 (everything but leather)

  5. #5
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    With stock gears (I'm assuming 3:73s?), your truck is pretty sluggish with those 35s already. As @SurrealOne mentions, a changing of the gears should be something you are considering as well if you are moving up another 2" or so in diameter.

    There is also a rule of thumb regarding tire width as it relates to rim width. I can't remember exactly what it is (someone will probably respond with the info if you need it) but I think if the tire is 4 1/2" wider than the rim, that may be too much and you'll have to change rims as well.


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    TIRES:
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  6. #6

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    If I upgraded to a 37 12.50 would the tires still rub? I trimmed the front bumper on the bottom so that it would eliminate any rubbing on the bumpe

  7. #7

    Default

    It's tough to say. Even though your width would remain the same as what you currently have, you'd be increasing the diameter by 2 more inches, which could have interesting effects when you've got the wheel turned all the way in one direction, when your shocks are compressed, and most probably when both occur at the same time.

    You should probably take some measurements with your truck in each of those conditions and see if you have 2 more inches of clearance. It won't be a perfect answer but it'll give you a pretty good idea of whether or not you've got more trimming to do if you upsize by another 2 inches in diameter.

  8. #8

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    Quote Originally Posted by mfleetwood View Post
    There is also a rule of thumb regarding tire width as it relates to rim width. I can't remember exactly what it is (someone will probably respond with the info if you need it) but I think if the tire is 4 1/2" wider than the rim, that may be too much and you'll have to change rims as well.
    The best rule of thumb is to check with the manufacturer as to the maximum size tire for which a wheel is designed ... and stay within that spec.

    Quote Originally Posted by lifted03z71 View Post
    The truck is a 1500 with stock gears and axles, there's 186k on the truck now and hasn't had any problems as far as axles go, thanks for the help
    You haven't stressed it, yet. If you move to shorter gears to restore lost torque and add even more stress with 37's (heavier than your 35's) and then go wheel it in mud pits or the like because you have the 37's to do it ... the axle and diff will be at risk, as what's in a 1500 is lighter duty than what's in 2500's. That's all I was trying to warn you about. If you just want a pavement monster you should have no problems...

  9. #9

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    Welcome to the G M T C !


    2010 Z/71 Colorado C/C
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    ===============
    2007 Winnebago Adventurer
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    Canyon Lake, Texas

  10. #10

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    Welcome to the club, it's good to have you aboard.............


    2002 Chevrolet Silverado Extended Cab SportSide: See Mods in My Garage

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