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>> I also wonder if I can figure out the percentage the diameter has changed >> and thus increase the speed (in my head) by that much more: >> For example, let's say that from 165-15 to 195/50-15 the diameter decreased >> by 3%, thus I can go 3% faster than what the speedo shows and still keep >> under or at the speed limit. > > Petri, you might want to have a look at this site. > http://www.miata.net/garage/tirecalc.html > You will have to add an 80 in the 165 tire size, meaning you'll have to size > the tire like this, 165-80-15 . This will then allow the system to calculate > the difference. I hope this helps. Bob, you are a legend (Aussie slang for a cool guy), that is exactly what I wanted to calculate. Thanks so much for that. It's a very significant change isn't it? Especially when you choose a metric conversion. At 100KMH I am actually going about 10KMH slower. Since my speedo is actually in MPH, then I think I will start going 5MPH faster than the speed limit if I want to keep with the crowd, but more than likely I will just keep reading the speedo as a true speed, I am not in a hurry :-) Does anyone else know the answer to my other question? Is it possible to adjust the speedo on my own or do I have to take it somewhere? Thanks again Bob. Petri 71 notch ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org