deutschland-dobson

This is the calculator that I use. Very helpful when messing about with odd sized wheels!:

http://www.1010tires.com/WheelOffsetCalculator.asp

frankvan

Info on 18 inch offsets:

https://rennlist.com/forums/964-foru...im-offset.html

https://rennlist.com/forums/964-foru...40-photos.html

https://rennlist.com/forums/964-foru...ze-for-c2.html

sml

when considering offsets, the diameter is 99% irrelevant .. hence no need to mention 18 inch, you could just say .. 'offset info here' ...

frankvan

agreed - rolling diameter is the crucial factor, but all three threads were talking about 18 inch rims and that seems to be the way people are going. And OP was asking about 18 inch so didn't want to confuse the issue