1. Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online
    Online since 2004, we are the #1 Chevy Truck & SUV forum and user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free
    Registering is Free and Easy! Hope to see you on the forums soon!

Yes a tire/wheel question.

Discussion in 'Wheels & Tires' started by Magna86, Feb 23, 2011.

  1. Magna86

    Magna86 New Member

    Alright I'm looking at a set of 17" wheels with some Goodyear Wrangler At/s mounted on them. First question do I have to have my PCM reprogrammed if I go from 16's to 17's?
    Secondly how do you guys like the Wrangler AT/S tires?

    Thanks
    Magna
  2. adampaul1964

    adampaul1964 Active Member ROTM Winner 1000 Posts

    Depends on the overall diameter of the tire not the wheel. Tell us what size tires, and we can better answer your question. Don't have any personal experience with the AT/S but I've never heard anything good.
  3. Magna86

    Magna86 New Member

    Current factory size is 245/75R16 and new size would be 265/70R17
  4. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member ROTM Winner Platinum Contributor 1000 Posts

    The 245/75/16's.....have a Overall Diameter of.....30.5in's

    The 265/70/17's.....have a Overall Diameter of.....31.7ins"

    With the 265/70/17's.......your Speedometer will Read...60 M.P.H.....your Actual Speed will be 62.3 M.P.H......3.8 % Faster

    For this difference you would want to have a Reprogramming to Correct the Speedometer for the Correct Speed you are going.
  5. adampaul1964

    adampaul1964 Active Member ROTM Winner 1000 Posts

    16" tire is 30.5" tall, 17" tire is 31.6" tall, so it's going to be an inch taller, which will make a difference, nothing major not like going to 33" or 35", If it were me I wouldn't worry about it. One good thing, with a 17" wheel your calipers will fit better!
  6. silveradotrailblazer

    silveradotrailblazer New Member ROTM Winner 1000 Posts

    I believe the factory ECM will self adjust up to 10% in tire diameters.

Share This Page