Can some explain Wheel offsets?
05-23-2003, 09:26 AM
#1
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Can some explain Wheel offsets?
I have a '69 911 with 9 and 11" turbo flares.Trying to figure out wich size wheels will fit.Currently has 7x16 and 8x16 Fuchs with spacers.
Looked at several wheels offered here and Ebay etc. But don't know anything about the "offsets".
Appreciate your help on this.
Thanks.
Gary C.
Looked at several wheels offered here and Ebay etc. But don't know anything about the "offsets".
Appreciate your help on this.
Thanks.
Gary C.
06-01-2003, 02:07 AM
#3
Race Director
"I have a '69 911 with 9 and 11" turbo flares.Trying to figure out wich size wheels will fit.Currently has 7x16 and 8x16 Fuchs with spacers."
I've got a diagram on my <a href="http://members.rennlist.com/951_racerx" target="_blank">951 RacerX website</a> in the "944 Wheels FAQ" section that explains all about wheel dimensions.
Best approach to take on your car is to draw up some diagrams of your configuration. Measure the inside and outside clearances and see how much room you have to work with. Typically, there's more room on the inside than on the outside. So removing the spacers will allow you to run a wider wheel. Although some cars have wheels that come close to the oil-cooler or its lines on the inside.
I've got a diagram on my <a href="http://members.rennlist.com/951_racerx" target="_blank">951 RacerX website</a> in the "944 Wheels FAQ" section that explains all about wheel dimensions.
Best approach to take on your car is to draw up some diagrams of your configuration. Measure the inside and outside clearances and see how much room you have to work with. Typically, there's more room on the inside than on the outside. So removing the spacers will allow you to run a wider wheel. Although some cars have wheels that come close to the oil-cooler or its lines on the inside.
06-01-2003, 07:10 PM
#4
Gary, it's very simple, your 7" Fuchs rim has a native o/s of +23.3mm, carefully measure the thickness of your spacer(multiply inches by 25.4 to change to mm) subtract the spacer from +23.3 and the result is the effective o/s of your current wheel.
An example assume a 23.3mm spacer is used
+23.3 - 23.3 = 0 mm os 3.5"(+ the flange thickness) of the wheel will be outboard of the mounting face and 3.5"(+ the flange thickness) will be inboard. The double flange thickness needs to be added because a rim width is measured bead to bead.
Here is a nice visual developed by a fellow named Andy from the UK(sorry thats all I can credit)
<img src="http://forums.pelicanparts.com/uploads/offset_visual_teardrop.jpg" alt=" - " />
An example assume a 23.3mm spacer is used
+23.3 - 23.3 = 0 mm os 3.5"(+ the flange thickness) of the wheel will be outboard of the mounting face and 3.5"(+ the flange thickness) will be inboard. The double flange thickness needs to be added because a rim width is measured bead to bead.
Here is a nice visual developed by a fellow named Andy from the UK(sorry thats all I can credit)
<img src="http://forums.pelicanparts.com/uploads/offset_visual_teardrop.jpg" alt=" - " />
