Hello, I drive a V 70 TDI from 6/99. The previous owner has mounted aluminium rims in size 8×17 with 215/45 tires. I am now considering mounting Columba rims (6.5 x 16). My questions to you are: Which cross section for the tyre width 205 is mounted on the Columba rims on the factory side? Or which cross section is recommended? I have seen many Columba rims with 205/50 tires, some with 55s and a set with 60s. Are therefore the 50s the most suitable? And secondly: How can I determine the roll circumference without measuring (since I don’t have the rims yet), because depending on the cross-section the actual top speed changes? Thanks already for your help! Many greetings, ms-driver