[thewheelman]

I'd like to swap wheels (16 inch)on my 08 S convertible. I'd like some of the other (fancier/sportier) Beetle wheels in 17' or 18' sizes. How do I calibrate speedo to be accurate with other than original wheels?

Thanks

 

[doctrsnoop]

as long as overall diameter is close you really don't have to. 16" tire is 205 / 55 / 16
17" is 225 / 45 / 17
18" is 225 / 40 / 18.
error is less than 1% for all

you can do the math for circumference, or go to a site like willtheyfit.com and put in the numbers

 

[Bugabu]

Also make sure your offset matches what you have by a couple mm's one way or the other too.