RS Motorsport :: Classic Speed Restored

Hi guys. I'm going to be increasing the wheel size from 13x6 inch 23p performance alloys on front to 7 inch of some make. Preferably with some dish. Standard Hub at the moment.

In diagram: The gap between the hub and the strut is approx 20mm. Between the thickest part of the tyre and the strut it's 8mm. The distance between where I measured from the hub to the thickest part of the tyre is 60mm. The width from the hub face to the tyre edge/face is 21mm. So I get 8.53 degrees of tilt on the strut?

So If I go to 15 inch, I.e. an extra inch (25.4mm) extra diameter up the strut I calculate the clearance will only "gain" an extra 3.8mm of space. Thus 20mm +3.8mm = 23.8mm, which means I won't be able to widen the wheels an inch inwards based on this offset?

The measurements weren't as precise as I'd like but it's the best I can do with the equipment I have.

Hello uhmm what was your name again??

Offset (ET) is the difference between the middle of the rim and the "face" of the rim where it sits against the hub.
So if you have a 6Jx13 ET19 rim (std Mk2 RS) and you change over to a 7Jx15 ET19 rim the 7 inch rim would sit not 1 inch but 1/2 inch (=12.7 mm) closer to the strut. If you fit a 7 inch rim that sits 1 inch closer to the strut it would not be an ET19 offset but ET32.

Regards, Leon.

Have a look here and it will give you the differences in your 2 scenarios etc.

As a bench mark (and as above) a 7inch rim with a 12P offset is ideal for an escort.

http://www.rimsntires.com/specs.jsp

Thanks guys. Paul, I was looking for something like this but couldn't find anything. Cheers!