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I run Toyo RA1s and start at 25psi all round, 205/55/16 F and 145/45/16 R.
In the Toyo Cup Series, the starting pressures are all over the map, some guys like 29 F/R others like me prefer 25 F/R other I am sure are running mixed pressures (different on the front and rear) so there is only rules of thumb, and even then there is a big range, so the best advice is play around with the pressure and see what you like, but you shuold pretty much start within that range.
As for what can be learned from the pictures of those tires, if they are RA1s they just got good....
Jim
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Jim Hamilton
If everything seems under control, your not going fast enough.
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