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I am running 205/40 R17 TOYOS Proxes TS-1. I have just filled them to the same level as my original 15s which is 2.3Bar(34psi) at the front and 2.1Bar(31psi) at the rear. If this is wrong for 17s someone please let me know as there is no guide anywhere!!
I have found that they like higher pressure than the orginal contis but I have only had them a week so I need to play around with the pressure. I would say you still need more in the fronts thou due to the weight balance. I am going to phone a few places to see what their opinion is.
A good sign is the tyre wear pattern, scrubbing out etc.