- Black springs - Clear body - Piston diameter 36mm - S: Single tube - E: Emulsion type shock absorber - Length: 311 mm - Stroke: 77 mm - Rate N/mm: 25 N/mm - Position: rear - Mounted spring: 00280-21 - Packaging unit: pair - ABE approved. These STX36's are designed to replace the dual shock absorbers on Touring models for comfort and improved rideability of your bagger.