I have a 2014 S and was doing some searching on replacing the spring on the rear shock with one that is a little bit more firm. Riding two up with the suspension set on the firmest settings i occasionally bottom out on travel and/ or scrape the center stand in the corners. Has anyone had any luck with a replacement spring. I did send an e-mail to Traxion Dynamics, but have not heard back yet. I think someone else on the forum was dealing with Racetech.