The Ohlins AP660 STX 46 Supersport rear shock is developed for controlled damping and consistent feel in demanding road and track use. It uses a pressurised oil/gas separated design to help maintain damping stability as temperatures and loads change. Fitment is intended for the Aprilia RS 660 and Tuono 660 rear mono-shock position.

Ohlins | Made to race, perfected to ride

Ohlins suspension units are built around predictable damping behaviour and clear adjustment response. The STX 46 Supersport family focuses on chassis control and tyre contact through a broad, usable adjustment range rather than extreme settings.

Design architecture

This is a mono-shock with a pressurised, oil/gas separated damping system rather than an emulsion layout. Separation of oil and gas is used to reduce aeration under sustained use and support repeatable damping performance.

Adjustments & what they change

• Rebound damping: influences how quickly the rear returns after compression, affecting stability and grip as the bike transitions off the brake and onto throttle.
• Compression damping: influences resistance to shock movement under load, affecting support during braking, corner entry load transfer, and bump absorption.
• Spring preload: sets ride height balance and operating point in the stroke, influencing turn-in attitude, traction and comfort.

Factory baseline intent

The baseline valving and spring fitment are selected to provide a workable starting point for a wide range of rider weights and typical RS 660 / Tuono 660 use. Final performance depends on setting sag and aligning damping to tyres, pace and surface.

Setup considerations

Start by confirming sag and overall balance front-to-rear before making damping changes. Make one change at a time and evaluate in the same section of road or the same track session so cause and effect are clear. If the bike feels harsh over sharp bumps, review compression first; if it feels unsettled after bumps or on corner exit, review rebound.

Serviceability & lifecycle

This Ohlins unit is designed to be maintained with periodic oil and seal service to keep damping consistent. Service intervals depend on use intensity, heat exposure and contamination, with more frequent servicing appropriate for regular track use.