Tire And Wheel Tech
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Tire vs. Rim Size Guide

15x6= up to a 9.50 wide
15x7= up to a 10.50 wide
15x8= 10.50-12.50 wide
15x10=11.50-13.50 wide
15x12=13.50-17.00 wide
15x14=14.00-20.00 wide

This is for good wear... The above numbers can be pushed around a little past the numbers listed but tread life or sidewall life will suffer...
Credit goes to "BadBowtieMHall" Administrator of S10Extremist.org
How To Measure Bolt Patterns
How To Measure Wheel BackSpace
The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up.  Take a straight edge and lay it diagonally across the inboard flange of the wheel.  Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel.  This measurement is backspace.  The above photo shows three wheels with 2",3", & 4" backspace.

Items required to measure  backspace: 
- Tape measure
- Straight edge
- Wheel w/o tire (preferred)
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