Can comeone give me a little info on backspacing on how to measure it what is more what is less...
and while your at it can you tell me about what backspacing I would need one a set of 18x9 wheels for a 2wd? I dont want them sticking outside of the fenders..
and I'll be running 275/35 18 on the rear and 235 40 18 on the front...
You will need like a +21 to a +25 to keep it from sticking out.
Slowest in Oklahoma...
Originally Posted by ecld_07
where are you getting the +21 and +25 from? Im curious to know how to measure backspacing too
1951 3100
1984 C10
https://rsracing.com/tech-wheel.html
Second pic down is Backspacing.
Third pic down is offset, which ecld_07 mentions.
(+) Means it's positive offset in mm(as opposed to negative).
According to the graph below that, you would need about 6" of backspacing.
But i thought it was more like 5.5??
Last edited by r6z4o6; 03-26-2008 at 06:23 PM.
1991 Silverado ECLB
LM7-T56
Backspacing is the distance from the mounting surface to the inside lip of the wheel. The easiest way to measure backspace is to put the wheel face down on the ground. Lay a straight edge across the rim of the wheel. Using a ruler or tape measure, determine the distance from the straight edge to the face of the flange mounting pad. This measurement is the wheel backspace.
Offset is the distance from the centerline of the wheel to the face of the mounting surface of the wheel that contacts the hub. Zero Offset indicates the mounting surface is at the wheel center. Negative Offset indicates the mounting surface is behind (or inboard) the centerline of the wheel. This is often found on standard rear-wheel-drive vehicles and on so-called reversed wheels. Positive Offset indicates the mounting surface is in front of (or outboard) the centerline of the wheel. This is often found on front-wheel-drive vehicles. Too much offset in either direction may cause contact between the wheel and/or tire to the vehicle's suspension and/or body components.
The bolt pattern for most late model 1500's is 6 x 5.5.
Last edited by Bipolar; 03-26-2008 at 06:20 PM.
Mixing alcohol and Prozac...
Its the offset from where the wheel mounts to the outer most part of wheel
When you go to order or look at wheels ask the dealer. they will explain it for you.
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