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Thread: PT Garage BETA testers needed
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12-23-2013 #11
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backspacing is a different indication and way of measuring than ET... ET is the amount of mm that the mounting face is from the center line of the wheel +number is face more towards outside of the wheel, -number is face more to inside of the wheel. I think you know how BS is measured. So a 7" wheel with ET 6 will translate to BS 4.25" and an 8" wheel ET 6 would be BS 4.75"
since these are 2 different types of measurements it could be a choice.... otherwise just call it backspacing since this is more common in the US.
The formula for ET to BS is: (25.4/ET) + ((wheelwidth+1)/2)
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