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I just put on a set of ME880's and am running at 40 psi front/rear. That seems to be the recommendation on the web site. Where are you guys seeing 50?
What size tire are you running? If they are the MU 85's then 40 would be correct. If they are metric(140/90/16) then42-44 solo,44-46 light 2 up,46-48 heavy 2 up per the link provided by lyfer on page 1 of this thread.