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Discussion Starter · #1 ·
Could some please explain to me the tire circumference table that can be found at http://de.openobd.org/audi/rns.htm#reifen
As I understand what should be put in Adaptation Channel 1 for the RNS-E, is the tyre circumference in millimeters. Is that correct?

If yes, how come that for instans, a tyre with dimenstions like 255/40-17 has the value of 1940, when really the circumference is 1997 mm?
Actually the whole list at http://de.openobd.org/audi/rns.htm#reifen is wrong?

What gives?
 

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NikolasZ said:
If yes, how come that for instance, a tyre with dimensions like 255/40-17 has the value of 1940, when really the circumference is 1997 mm?
Actually the whole list at http://de.openobd.org/audi/rns.htm#reifen is wrong?
What needs to be entered is the ROLLING circumference, not the STATIC circumference.

Your 1997 mm figure is the static circumference. When the tyre is taking the load of the car is compresses the tyre reducing the effective (rolling) circumference to 1940 mm.

So the table on openobd.org is correct.

You can either enter 0 and let the RNS-E auto-learn over the first 500 miles (800 km) or so, or give it a "helping hand" and enter 1940 to help it learn quicker.

Either way expect your navigation to bit a bit out of position at junctions for the first 500 miles or 800 km.
 

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Discussion Starter · #3 ·
What needs to be entered is the ROLLING circumference, not the STATIC circumference.
But of course! That makes perfect sence. Thank you very much for clearing that out for me!
 
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