barefootbonzai
04-05-2007, 02:36 PM
Found this website on wheel terminology, lots of useful info in there.
https://www.rsracing.com/tech-wheel.html
here's an extract.
https://www.rsracing.com/images/tech-wheelfit1.gif
Measuring Wheel Offset
To calculate offset you'll need the following measurements:
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel backspace
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel Width
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel Center line (outboard flange to inboard flange measurement / 2)
Subtract:
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel center line from Wheel backspace to get offset.
https://www.rsracing.com/_themes/rstheme1/abstrbu2.gifIf backspace is less than the wheel centerline the offset is negative
https://www.rsracing.com/_themes/rstheme1/abstrbu2.gifIf backspace is greater than the wheel centerline the offset is positive
Tip:
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifTo convert from inches to mm multiply by 25.4
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifTo convert from mm to inches divide by 25.4
https://www.rsracing.com/tech-wheel.html
here's an extract.
https://www.rsracing.com/images/tech-wheelfit1.gif
Measuring Wheel Offset
To calculate offset you'll need the following measurements:
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel backspace
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel Width
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel Center line (outboard flange to inboard flange measurement / 2)
Subtract:
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifWheel center line from Wheel backspace to get offset.
https://www.rsracing.com/_themes/rstheme1/abstrbu2.gifIf backspace is less than the wheel centerline the offset is negative
https://www.rsracing.com/_themes/rstheme1/abstrbu2.gifIf backspace is greater than the wheel centerline the offset is positive
Tip:
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifTo convert from inches to mm multiply by 25.4
https://www.rsracing.com/_themes/rstheme1/abstrbu1.gifTo convert from mm to inches divide by 25.4