Join Date: Mar 2013
Location: Central Illinois
Instead of worrying about the standard pressures try thinking of it this way. A larger diameter wheel will have an inherently larger contact patch than a smaller wheel. Now how much air did you use in the standard wheel and what does that imply in terms of contact patch size given the front wheel weight load? OK, so the new wheel must carry exactly that same amount of load so what does it take to make the new wheel have a similar sized contact patch, given that the tire will deflect less with a larger diameter to arrive at the same patch area. This should help you figure how low the air pressure will be to achieve the same patch area. That is your target pressure for the new larger wheel.
Present ride - 2013 Victory Vision, black, ATW at +3, Lloydz air filter and adjustable intake, PC5, 30,xxx miles