I run mine at 41 psi rear, and 38 front (solo riding), and the bike handles great. I do have full luggage fitted (rack/top box and side panniers) which obviously adds weight to the rear end. I've also fitted YSS rear shocks to mine, which are excellent. I always wondered if the main reason RE recommended a lower psi for rear tyre versus the front, was to help compensate for the hard ride quality of the OEM rear shocks - i'm no expert though.