Boxxer Solo Air Upgrade kit 
New Solo Air™ spring with revised spring curve, air spring tunability with Bottomless Tokens (4 included in package). Compatible with BoXXer World Cup forks from MY11 to MY15 (serial number later than 16T11XXXXXXX).
Solo Air is like a Buddhist monk. Its enlightened design lets you add air to your forks through a single Schrader valve, filling both the positive and negative air spring chambers simultaneously. So they’re always in perfect equilibrium, like Yin and Yang. Giving you a plush, predictable ride you can set up in seconds, with the lightest weight air spring on the market.
- air spring
- fits RS Boxxer (2011-2015)