OST+

 

Efficiency or comfort? Have them both!

In 2008, we launched the 1st version of the patented OST (Optimised Suspension Technology), our first virtual pivot point suspension kinematics adapted to medium- and long-travel suspensions. It complemented our FPS technology, included on shorter-travel models. Designed to adapt to travel ranging from 120 to 180 mm, OST technology is the cornerstone of the success enjoyed by the Zesty, Spicy and Froggy models.

In 2012 we launched a new version of our famous kinematics: OST+ and then further developed it for 2016. Revised positioning of the pivot points and a better suspension curve have made OST+ even more effective. Its exceptional performances both downhill, with excellent comfort; and uphill, with its unrivalled efficiency, make it the new benchmark.

Virtual pivot point

Our OST+ suspension is based on virtual pivot point kinematics. What is a virtual pivot point? You talk about a virtual pivot point when the rear wheel axle is not joined to the frame by a single pivot point. In our case, OST+ has two connecting rods linking the rear wheel axle to the front triangle. Specifically, the virtual pivot point is located at the intersection of the lines running along the axes of the two links, so it moves as the suspension compresses.

This means that the rear wheel does not follow a circular arc trajectory, but the optimal movement resulting from the combined movement of the two links. This trajectory is always perpendicular to the chainline. This feature, characteristic of OST+ technology, prevents any kickback from occurring and therefore prevents the workings of the suspension from disrupting pedalling.

 

How does it works?

The bob effect caused by pedalling is continually countered by the force applied by the chain :

  • Equilibrium point : when the rider is on the bike, the suspension is at the equilibrium point, which is called "SAG" and which depends on the rider’s weight. In this position, the virtual pivot point is in line with the chainline, so there is no pedal-bob effect.

  • Compression (positive travel): the rear wheel moves upwards and the virtual pivot point is above the chainline. The chain tension therefore tends to cause the rear wheel axis to move back down towards the equilibrium point.

  • Extension (negative travel): the rear wheel moves downwards and the virtual pivot point moves below the chainline. The chain tension therefore tends to cause the rear wheel axis to move back up towards the equilibrium point.

 

What’s more, the ratio curve of OST+ kinematics has been calculated to achieve the best possible suspension performance. In fact, the suspension is very sensitive at the start of the travel (for good absorption of small bumps) and progressive at the end of
the travel (the suspension hardens at the end of the travel on major impacts, which prevents it bottoming out).

On bikes fitted with OST+ suspension, the front derailleur is attached to the chainstays, not the front triangle. This position enables the derailleur to move with the rear wheel and, therefore, always stay correctly lined up with the chain. Gear changing
remains fluid and effective, whatever the circumstances.

Thanks to OST+ technology, all the versatility of a modern MTB is available to you. From trail to all-mountain to enduro, our bikes marry high performance with ride enjoyment. When combined with our e:i Shock technology, OST+ becomes quite simply
unbeatable! Comfort and efficiency like you’ve never known before.

 

Find the OST technology on Froggy (180 mm)