The SIP performance shock absorbers were available with “XL” springs in 2010. Some of the riders from the racing fraction were in need of softer springs to enable a finer tuning of their suspension setup. The “M” springs we can now also supply for this suspension system are approximately 20% less stiff than the “XL” version. The intentional low price makes suspension tuning especially affordable and attractive.
Conclusion: Ideal adjustment abilities aesthetically as well as technically! “
Mike Betz, GSF, ESC Rennteam 2010:
"All in all, the rear shocker produced by SIP with the “-20%” spring has the potential to perform!”
Steffen Biedermann. 07/2010:
"Tested on an ESC K3 scooter with a complete SIP chassis. Shock calibration was NOT changed between both spring tests. Spring preload was adjusted to soft. Tension adjustment hit middle with a click. Handling was impressively more comfortable, holding well on the uneven parts of the track with remarkable stability and security. In the past, where a hard spring was a guarantee for a hard ride, the wheels flowed over bumps with ease. A punch on the rear tire was not detected when braking hard in a chicane. Well worth purchasing "