The Arma MX is a direct bolt-on replacement for most popular E-MX bikes. No additional Hardware is needed, simply bolt-on and go. Shock will be pre tuned by EXT-USA on the information you provide. Compatible Bikes: Sur Ron Light Bee-X Talaria (All Models) E-ride Pro (All Models) Altis Sigma Ventus One CORE FEATURES 4 way adjustable: LSC-HSC-LSR-HBC (Hydraulic Bottom-Out Control) High flow 29 mm main piston 24 mm valve piston 14 mm shaft (50% larger than most other coils on market to help deal with large side loading events) Engineered rebound circuit to separate bump and rebound oil flow – Ultra low-friction coating User adjustable HBC technology Very low reservoir pressure for maximum sensitivity and low cavitation(55 PSI) Full custom hydraulic setup that is bike and rider specific for each shock Very low hysteresis for high dynamic response High turbulent flow for progressive dampening and mid stroke support Low friction seal Thinner bottom-out bumper and debris clearing washer New low profile rebound knob for easy spring swap Included with 1 light weight spring available in 400lb, 450lb, 500lb, 550lb or 600lbs (Lower options may be available upon request) Comes with Sur Ron specific mounting hardware for easy bolt in instillation. *This is a special edition shock that will be built in limited runs.