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  1. #1

    Question Z71 wheels and tires

    I have a 2009 Z71 4x4 extended cab ,what i want to know is if i can run 275-55-20 inch tires and wheels like on a reg. 4x4. The wheels tires i have on now are 265-70-17 . The dealer says i can't run 20 inch wheels because of the Z71 suspension. anyone have thoughts on ideas on this, if true or not. THANKS, PaUltraBob

  2. #2
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    mfleetwood's Avatar
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    I don't think you'll have any problems, as those tires are very similar in width and diameter. I not good with offset/backspace, but I think if those rims are the same as your stock, you should be okay all the way around.

    tock Tire - 265/70R17 Search Tires Tire 1 - 275/55R20 Search Tires
    Section Width: 10.43 in 265 mm
    Section Width: 10.82 in 275 mm
    Rim Diameter: 17 in 431.8 mm
    Rim Diameter: 20 in 508 mm
    Rim Width Range: 7 - 9 in
    Rim Width Range: 7.5 - 9.5 in
    Overall Diameter: 31.60 in 802.64 mm
    Overall Diameter: 31.90 in 810.26 mm
    Sidewall Height: 7.30 in 185.42 mm
    Sidewall Height: 5.95 in 151.13 mm
    Radius: 15.80 in 401.32 mm
    Radius: 15.95 in 405.13 mm
    Circumference: 99.27 in 2521.4 mm
    Circumference: 100.2 in 2545.0 mm
    Revs per Mile: 652.0
    Actual Speed: 60 mph 100 km/h
    Speedometer1: 59.4 mph 99.0 km/h
    Speedometer Difference: - Speedometer Difference: 0.950% too slow
    Diameter Difference: - Diameter Difference: 0.95%

    http://www.1010tires.com/TireSizeCal...?action=submit


    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

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