Sirris R38 Shock: E Ride Pro SR

The Sirris R38 Rear Shock upgrade brings true motocross-inspired suspension technology to the E Ride Pro SR. Based on the proven Sirris R46 platform, the R38 features oversized internal architecture, massive oil flow, and an advanced 2-Stage Compression (2SC) damping system for exceptional control, consistency, and durability on aggressive trails, jumps, and high-speed terrain. Unlike typical mountain bike-based e-moto shocks, the R38 Shock is engineered specifically for the demands of lightweight electric dirt bikes. Independent high-speed and low-speed compression adjustment, rebound adjustment, and spring preload allow riders to fine-tune suspension performance for any riding style or terrain. Features Designed specifically for the E Ride Pro SR Moto-inspired R46 internal architecture in a compact chassis Independent high-speed and low-speed compression adjustment (2SC) Tool-free rebound adjustment and spring preload adjustment High-flow 38mm piston for consistent damping and reduced fade Large 16mm hollow hard-chromed shaft for maximum strength Type III hard anodized aluminum body with ACME threads CMX (Compact Motocross Tune) optimized for aggressive off-road riding Pairs perfectly with the Sirris F43 CMX Fork: E Ride Pro SR Important: The original factory E Ride Pro SR linkage is not compatible with the Sirris R38 Shock. The R38 requires the Prickly Sirris R38 Linkage Kit. The Prickly Linkage raises the rear of the bike approximately 25mm to properly accommodate the larger R38 shock. Specifications Length: 289mm Stroke: 78mm Shock Type: Piggyback, steel spring Weight: 3.3 lbs (1.5 kg) without spring Low-Speed Compression: 18 clicks High-Speed Compression: 24 clicks Rebound: 24 clicks Spring Preload: Adjustable Spring Options Medium: 140 lbs - 180 lbs (90 N/mm spring) Heavy: 180 lbs - 220 lbs (100 N/mm spring) Compatibility E Ride Pro SR Important Notes: Requires the Prickly Sirris R38 Linkage Kit (sold separately). Stock E Ride Pro SR linkage is not compatible. Optional CMX Dork Drop Clamp is recommended to maintain balanced chassis geometry. Suspension Tuning Recommendations R38 Shock Medium Heavy Compression Setting LSC 12 / HSC 12 LSC 10 / HSC 12 Rebound Setting 8 7 Spring Rate (N/mm, lb/in) 90 100 Preload Setting (mm) 4 4 F43 CMX Fork Medium Heavy Rider Weight (lbs) (No Gear) 140-180 180-220 Spring Rate (N/mm) 4.0/4.0 4.4/4.0 Fork Height in Upper Clamp (mm) 6.5 6.5 Compression Setting 15 13 Rebound Setting 13 11 Preload Setting (mm of preload R and L fork legs) 4/4 4/4 Oil Volume (Bath Oil) 100cc 120cc Oil Weight* (bath/cartridge) 20/5 20/5 Headset Spacer 1mm thick washer beneath seal, PN 430-38-017 None Steerer Spacer 5mm thick above top clamp / beneath top cap 430-38-018 x4 Caliper Bracket 430-22-034, 99.5mm Wheel Spacers 430-22-016 x2