R1U webpage still shows 500 as having Kenda Kwick Seven.5 27.5"x2.2".   The 700 and LMT'D have  Schwalbe Super-Moto X 27.5”x2.4”.    I was going to order the 500, but the shipping date got pushed back, so I'm probably going to hold off on an e-bike this year.  I'm riding a standard Trek bike in the meantime, also with unlimited range.