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| | | | Joined: Aug 2014 Posts: 307 'Bolter | | 'Bolter Joined: Aug 2014 Posts: 307 | I have a stock 1/2 ton Chevy 3100 and would like to buy new wheels. Best I can determine with the tire on I measured 3 1/2 for the backspce. I have been told by Chevys of 40 that stock would be 3 3/4. Anyone know what the correct measurement is? Thanks, Scott | | | | | Joined: Aug 2014 Posts: 307 'Bolter | | 'Bolter Joined: Aug 2014 Posts: 307 | | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | What width wheel are you wanting to run? Backspace will vary depending on wheel width, as well as what offset is being used.
According to GM Heritage, the stock base wheel has the dimensions of 16 x 4 1/2", and an offset of 9/16". It does not specify positive or negative on the offset, however, I'm inclined to go with positive offset in this case. That taken into consideration, the backspace with the factory width wheel would be 2 13/16" if my math is correct.
Bill Burmeister
| | | | | Joined: Aug 2014 Posts: 307 'Bolter | | 'Bolter Joined: Aug 2014 Posts: 307 | 15 x 6, 3 3/4 backspacing, bolt pattern 6 x 5 1/2.
Chrome smoothie.
The is stock. | | | | | Joined: Aug 2014 Posts: 307 'Bolter | | 'Bolter Joined: Aug 2014 Posts: 307 | | | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | Longbox math correct. Which means, since backspace is all about whether rim will hit suspension or steering components, you need to be sure the extra .938 (15/16) won't hit anything, tire and wheel, front and rear, INCLUDING when fronts are turned stop to stop. Danger lurks. "Double, double toil and trouble" "Check the whole deal before you buy the wheel"
You said your truck is stock so we are all assuming the wheels are stock. Measurements are not that hard to do with tire on. Just need the correct length stick.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: Aug 2014 Posts: 307 'Bolter | | 'Bolter Joined: Aug 2014 Posts: 307 | Thanks for your input. I mentioned, I pulled the wheel off ( with tire on ) and used a straight edge and carpenter square and measured 3 1/2 inches. It seems to me this should be pretty simple. I plan on calling Chevys 40 to discuss this. | | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | Well if the wheels are 3 1/2, you are only increasing stick-in by 1/4 not 15/16. You are correct, easy to see with wheels/tires you have now if you have a 1/4 to give.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Are your current wheels originals? With the measurements you're giving, it sounds like you may have a later, wider wheel, which would have a deeper backspace.
Bill Burmeister
| | | | | Joined: Aug 2014 Posts: 307 'Bolter | | 'Bolter Joined: Aug 2014 Posts: 307 | Don't know if they are original. Presently I have a set of 750 x 16 tires on it. | | |
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