trouse40

iTrader: (3)

how many milimeters are in 1 inch? i want to get some hp evo's 9 inch rears and get them widdened to 11" so that would add 2 inches to the backspacing. if the wheels have a 38mm backspacing now what would they have after an aditional 2 inches?

f-bodman

There are 25.4mm in an inch.

trouse40

iTrader: (3)

im not saying thats wrong but that means my z06 wheels have 2 (53mm)inches of backspacing

TTSSZ

iTrader: (8)

No, have 2 (53mm) inches of offset.

Fulton 1

iTrader: (9)

That's doubtful. If you lay a straightedge across the back of your wheel and measure down to the inner surface of the hub mounting pad, then you'll have your backspacing. You may be confusing offset with backspacing...?

Here's a link that may help: http://www.rsracing.com/tech-wheel.html

89FormulaLS2

iTrader: (1)

Regardless of offsets and backspacing differences..............

25.4mm = 1 inch is correct.

evilbadz

iTrader: (1)

Google calculator is your friend

http://www.google.com/search?q=1+inch+in+millimeters

Eugenio_SS

iTrader: (2)

backspacing is usually given in inches.
offset is usually given in mm
backspacing and offset are not the same but are inter-related.