- Black springs - Grey body - S: Single tube body - Piston diameter: 36mm - E: Emulsion type shock absorber - Length: 280 mm - Stroke: 68 mm - Rate N/mm: 22 N/mm - Position: rear - Mounted spring: 66420-022 - Packaging unit: pair - ABE in preparation. The STX36 is a shock that's been around the block and it paid it's dues when it comes to performance and durability. Especially for the cruiser market when taking riding a step up, the STX36 is an excellent investment when suspension characteristics are important to you.