Rim size/offset

Discussion in 'Lifted & Offroad Suspension' started by lordfrosty, Feb 28, 2009.

  1. lordfrosty

    lordfrosty New Member

    Can someone please explain to me how you figure out rim size and about offsets negative/positve. I've got a 07 Sierra 1/2 ton with 275/55 20. So If I wanted to put 285/55 20 tires on what size rim would that be? And if i wanted my wheels to stick out a bit, how would I do that.
  2. adampaul1964

    adampaul1964 Epic Member 5+ Years ROTM Winner 1000 Posts

    the 285/55/20 is less than 1/2 inch taller than your current tire and only 3/8 of an inch wider, if you have factory rims the offset is positive 31mm so if you go to a rim with say 20 mm positive offset the tire would stick out around maybe 1/2 inch more at most, which doesn't seem like very much but visually it will make a big difference, hope this helps.

    check this post out, it's pretty good:

  3. lordfrosty

    lordfrosty New Member

    So, if I want to make my tires stick out more without changing my rims, how would I accomplish this.
  4. DrewsZ71

    DrewsZ71 Rockstar 100 Posts

    Here, try this website http://www.wheelsmaster.com/rt_spec...=55&bd2=20&rd2=20&rw2=8.5&et2=19&text1=&text2=

    It lets you play around with different tire sizes and offsets and gives a pretty descriptive detail about what will and will not fit. The current setting on the page are from my truck but you can play around with them and get a good idea of what kind of clearances and measurements are going to look like.
  5. lordfrosty

    lordfrosty New Member

    Thanks, thats a helpful website. So, the greater the offset the more the tire will stick out (is that correct). Is there something i can do to make my tires/rims stick out more without changing them.
  6. DrewsZ71

    DrewsZ71 Rockstar 100 Posts

    The more the negative offset the more the tire/whell will stick out. Also, take this into account that the more the wheel/tire moves outward the closer it will bring it to hitting or rubbing on the fenders when the wheels are turned left or right.
  7. Chevy Newby

    Chevy Newby Rockstar


    I am having the same problem with my truck. I want to change my wheels but the wheels I want have a negative 25 offset which means they will stick out about 3 1/4", so I would need to do a body lift of maybe 3"s. But the greater the NEGATIVE offset of the wheel the further it will stick out, I do know that much. But maybe you can get away with adding spacers to your existing wheels and the wheel push them out a little bit and give you that aggresive truck look we are lookin for. Drew and Adam are 110% righyt in their statements...I love this site.:sign0020::party:
  8. 94short&wide

    94short&wide New Member

    help i dont know what iam doing

    my friend has a 55 chevy he is selling the rims will they fit my 94 gm 1500

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