Öhlins launch revolutionary new TTX Flow MX shock!
Öhlins launch revolutionary new TTX Flow MX shock!
The shock features new patent pending pressure technology combined with an all new ‘spool’ check-valve system which essentially helps the shock cope with multiple forces at once and ‘forget’ them extremely quickly, retaining chassis balance. In rider feedback this equates to vastly improved handling in whoops, braking bumps (so the rear wheel doesn’t go light) and absorbing harsh hits where the bike needs to remain settled for a large jump. Bottoming resistance is also improved through the introduction of a new bump rubber cup unit.
The TTX flow has also been fully redesigned through every single component to make it much more rider and mechanic friendly, for both maintenance and set-up. The spring is now extremely easy to change due to a new spring clip design and the simple spring pre-load adjustment is more robust. Adjustments can easily be made to compression and rebound with a new indicator to show positioning.
The system retains the Öhlins patented TTX (Twin Tube) Technology with a 46mm piston and 16mm piston rod. There are a wide range of springs to suit rider weight and riding style. Available for all main adult MX and Enduro models.
TTX Flow features at a glance:
Newly developed shock featuring TTX-technology
46 mm piston and 16 mm piston rod
A new 58 mm gas reservoir on majority of applications
Patent pending pressure technology
Improved bottoming resistance through new design of bump rubber cup
Compression and rebound adjustments with indicator
Easy and cost effective to service
Simple spring change due to new spring clip design
Spring preload adjustment more robust
Wide range of springs
Most new and recent MX and Enduro models covered
Öhlins TTX Flow Technology
Technology and layout of TTX Flow
The TTX-Flow and the TTX 44 share the same basic oil flow pattern. However, the orientation of certain key features has helped getting more desirable dynamic effects.
One example is the check valve on the rebound side which is now positioned in the flow unit, closer to the gas reservoir than before.
On the TTX 44 it was placed in the seal head holder at the bottom of the shock body while now moved to the cylinder head.
Apart from the basic system layout, the TTX-Flow uses the Flow valve system to replenish the shocks compression and rebound chambers, as opposed to the more conventional shimmed check valve system used on the TTX 44, enabling it to maintain a predictable behavior and recover more quickly.
The Flow unit containing the shimmed compression valve shim stack and the check valve function for compression and rebound. Check valves are no longer shim types but spring preloaded spool valves.
Compared to TTX 44, we have improved traction, comfort, “Progressive-feel” (smooth on small chop but strong enough to handle bigger impacts) as well as gotten calmer chassis movement. TTX FLOW also carries less memory, which makes it less situation dependent and quicker to be ready to handle any new hit. This makes the shock predictable as it always responds equally for similar situations. Because of the independence of previous or current ongoing actions, the shock can handle dual actions better. Examples of such are chop or edges at jump face being hit during the longer ongoing G-movements of the jump face or holes and edges hit in the landing-phase of a motion.
This will be felt mostly by the rider as comfort or bottoming resistance or being able to better hold up in the stroke. As the shock stays up better during dual actions, the need to compensate by adding damping is now gone, contributing to the shocks smoothness on less violent movements. Together with our improved rebound action, the Flow shock gives a smooth and calm feeling especially beneficial for corner entry, allowing the rider to be more precise and carry more speed while entering the corners.
As TTX helps us cover a wider shock speed range without dynamic compromises than a single tube shock, the new Flow unit further widens the speed range with perfect dynamic compensation, resulting in a shock easier to set up while requiring less adjustment track to track or day to day. The wide uncompromised speed range also allows for a wider range of riders being able to use the same shim setting.
All in all, the shock is straight up better performance-wise than our previous TTX 44 without being inferior in any area.
As an effect of the performance described in section 1, the shock is now easier for the normal rider to handle on his own and find a good setup with. We actively chose to simplify for our customers by reducing the click combinations from a multi click low speed and a 3 position high speed adjuster. Instead, we have the same adjustability brought down to just 12 clicks of compression adjustment. All these 12 clicks are usable ride-positions and covers the entire workable click range of the older type of low speed adjuster found on our TTX 44.
Due to the use of new pressure balance levels over the velocity range, the volume of oil passing through the compression circuit increases as the shock moves up in velocity. This volume flow change gives TTX Flow’s compression adjuster more effect over the entire velocity range, compared to the TTX 44 where the volume of oil reaches a static state at a lower shock speed. The effect is not visible as pure force but as energy absorption which is the factor that gives an effect at the track. By this oil volume flow change, we have managed to reduce the need for a separate high speed compression adjuster in the new TTX Flow.
Graphic curves of compression click effects at 1m/s, showing that click position has an influence at a shock speed where the compression clicker effect were negligible on TTX 44.
The difference of bleed effect (compression adjuster) between TTX 44 and TTX Flow. Pictures showing flow paths as function of speed where bleed is involved throughout the entire speed range while shims and ports/valves etc steps in on higher speeds.
All available compression and rebound clicks at TTX Flow will keep pressure balance in control from fully open to fully closed on both compression and rebound. The rebound adjuster now has a camshaft design where we are specifying the exact position of the adjustment needle for each click to be able to reach all desired positions in the workable range of a normal adjuster, but with a better monitored spacing between each click.
Rebound adjuster’s camshaft design. We are now able to monitor every click position to get the needle in the exact spot we want it. In this way, we can cover the usable click range within 11 clicks and keep a more linear spacing between each click than before.
Easier to service or repair
The entire TTX Flow has been re-designed with service centers and customers in mind and is much easier to service and repair compared to TTX 44.
The shock is now faster to inspect as both check valve functions are located in the flow unit. Additionally, the shock does not have to come apart if collars for spring preload are damaged and needs to be replaced. Also we have removed the external seal head holder from the bottom of the shock. Inner and outer tubes are separate pieces and can be ordered separately in case of damage. While going away from the seal head holder design, we now hope that we are taking away the reason to hesitate offering service. Especially for those cases where taking apart the seal head holder were making service costs too high to easily justify the total service cost for the customer.
As all check valve function are located in the Flow unit now instead of rebound one way valve in the seal head holder as before, the inspection to check or clean them are much faster. Simply, take out the flow unit and clean the surface between the moving discs and all check valves has been ensured to be clean and functioning.
Additionally, the new spring clip design takes away the risk of getting stuck while mounting or dismounting the spring. Now, the spring clip does not have to go through the spring presser anymore. Simply, compress the spring and spring clip until the flower shaped piece on the end bracket runs above the tags in the spring clip. From there, turn 90° and the spring clip will change position between locking and being able to let the end bracket through.
We have addressed the issues we have had on the TTX 44 and solved them for TTX Flow. Hence, we now have redesigned the following parts especially for quality improvement.
Steel inner tube for better wear and better roundness than the 04640-tubes used on TTX 44
Redesigned seal head design. Top out now stops at an aluminum lip and the top out rubber cannot over compress anymore. Normal outer o-ring to seal towards outer tube instead of combined piece as in later TTX 44.
Main spring preload solution. While moving away from the plastic version that got stuck as soon as it saw some dirt or dust, to aluminum preload collars that were damaged once rider’s gentle hands attacked them with hammers and screw drivers, we have now changed the preload collar material to steel for better durability and to withstand higher forces.
Plastic sleeves on KTM shocks for wear protection.
Q: Why is there no high speed adjuster?
A: As described in section 2, our new design has reduced the need of a high speed adjuster and we are simplifying to find a set up for the end user too.
Q: Why is there Just 12 clicks compression / 11 clicks rebound?
A: As described in section 2, we cover all the normally used click range of our previous shocks, but within fewer clicks and with better monitoring of them.
Q: Can the shock be tuned by changing spring rates in the flow unit?
A: The springs in the flow unit are carefully chosen to set a certain internal pressure pattern in the shock. These springs are not an active part of tune ability.
Q: What spring series will TTX Flow use?
A: TTX Flow uses the same spring series as before; 06310-XX for most bikes and 06320-XX for the link-less KTM’s.
Q: How do I make a TTX 44 feel like TTX Flow?
A: As FLOW has a completely different pressure pattern which creates the positive feeling on the track, there is no way to make a TTX 44 more similar to a TTX Flow
Q: What is better than TTX 44?
A:Everything ! From track performance and user friendliness to easier maintenance work and better quality.
Q: What is different to TTX 44?
A: Everything! (Except the piston rod, rebound needle and bleed jet)
Q: What new tools are needed to work with TTX Flow?
A: Please check out the excel sheet “Tools and maintenance parts year by year MX/E” on world.ohlins.com. The main tool needed will be the new compression valve tool, (01863-03) needed for reshimmings as TTX Flow is more sensitive on pressure balance than TTX 44, requiring more frequent changes on the compression valve than with TTX 44. On the other hand: One shimming normally covers a wider range of riders than on TTX 44.
Q: Is there anything with TTX Flow that’s inferior to its predecessor TTX 44?
A: As far as we know, the only risk we see is a slightly shorter service life for the solid piston band on the main piston. TTX Flow uses 70 shore O-rings behind the piston band instead of 90 shore as TTX 44, and we believe the 70’s drop off more significantly. The sign of when to change piston band is when the rider is out of compression clicks. Changing piston band will bring the clickers back out towards the middle of the scale again. Luckily, we can now offer a tool set for piston band change.