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  1. #1

    Default First Time Poster But Long Time Reader - Need a little help

    I just traded my stock 2001 Silverado LS for a 2004 Sierra SLT Ext. Cab that's got a 6" Fabtech lift and completely bald 325/70R17 Open Country AT's on non-stock 17" wheels that I hate. I looked at this as a chance to put on what I want, but I am completely new to the lifted world and need a little help...

    I've chosen a wheel (Helo 835 18x9, 18mm offset, 5.71 backspace) but have been unable to determine the largest tire I can use without trimming. (This means I've also not selected a tire, yet.) Combing these forums (searches) has yielded no usable help, as those running similar setups are either NBS, a different lift height, or have trimmed. I'm contemplating the following:
    • 33x12.5R18's
    • 35x12.5R18's
    Can anyone provide insight as to whether I can run either of these sizes on that wheel without issue or trimming? Can I go bigger? If so, how much bigger? Should I go smaller? If so, what do you recommend?

    While I am asking questions, I'm also looking for a wheel-to-wheel nerf bar (with step) that will fit the truck. The trick is it's got an 8' bed and I'm finding few options for that scenario. Any advice there would be welcome, too, as climbing into the truck as well as getting to a truck box is tough for me without this.
    Last edited by SurrealOne; 08-15-2011 at 02:24 AM. Reason: typo correction

  2. #2


    Welcome to the club. I believe the maximum wheel backspacing with the Fabtech lift is 4.5". Check out N-Fabs step bars.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  3. #3


    Quote Originally Posted by silveradotrailblazer View Post
    I believe the maximum wheel backspacing with the Fabtech lift is 4.5". Check out N-Fabs step bars.
    Thanks, that's useful information. Looks like it's 17x8 @4.5in BS or I'm back to wheel shopping again. *sigh*

    I had checked out N-Fab step bars but they don't seem to have 6-step bars for 2004 trucks with long (8') beds. About all I can find is Tough Country...
    Last edited by SurrealOne; 08-16-2011 at 02:26 AM. Reason: typo correction

  4. #4


    Much thanks for the response -- it was the piece of information I was missing to fit the pieces of the puzzle together, properly. Everything's squared away, decision-wise, and the appropriate purchases have been made. Now I wait. *sigh*

  5. #5


    this probly wont help any now since you bought every thing but if you get the wheel since and every thing your thinkin about runnin and take it up to like a discount tire or some thin they can always tell you if theres going to be rubbing

    2011 Silverado (Ellie)
    Extended cab

    K&N Cold Air Intake
    Gibson Extreme Dual Exhaust
    Leveling Kit
    Warn Bull Guard
    Blackedout Bowties
    BF Goodrich All Terrains

  6. #6


    You'll be fine running 35x18x12.5 tires! 6in lift and 35 tire is a great combo

    2006 Duramax LBZ
    Edge Evo
    4'' Diamond eye to 6'' tip
    16'' ion alloy, 33'' fierce attitudes
    Lots of work left to do!

  7. #7


    A little bit of information in case others might find it useful:
    1. With 4.5" backspace being stock for my truck and 4 5/8" being the backspace supported for a 6" Fabtech lift I elected to stick with 4.5".
    2. I found that my chosen wheel was available in 4.5" BS as a 17x8 rim... a bit smaller than I'd wanted but acceptable.
    3. The 17x8 rim coupled with my desire for Nitto Trail grapplers AND insistence on a D-rated tire for ride quality brought me to 315/70R17. The 35x12.5R17 (next size up) is an E-rated tire and needs a minimum of 8.5" wide rims -- both of which are no-go's for me.
    So my tires will be 34.61" tall instead of 34.84" ... and have 1/32" less tread depth than they'd have had in 35x12.5R17. I'm pretty pleased with the selection. Mounting, balancing, and alignment is being done this morning.


    P.S. I ended up ordering IC's 4" polished stainless wheel-to-wheel nerf bars (NERF431CH). Next I need to research dual alternator and battery setups (possibly with a combiner), as I want the redundancy of dual alternators and the discharge capacity of dual, deep-cycle batteries. It's a precursor to some heavy electrical additions.

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