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    • Home
    • BUILDING THE BIKES
    • Suspension Tech Details
    • VAST SYSTEMS ADVANTAGES
    • TESTING
    • About Bhaack
Bhaack
  • Home
  • BUILDING THE BIKES
  • Suspension Tech Details
  • VAST SYSTEMS ADVANTAGES
  • TESTING
  • About Bhaack

FURTHER DEVELOPMENT OF MOUNTAIN BIKE SUSPENSION

From when rear suspension was first tried, the mountain bike industry has been fighting the problem of pedaling energy being lost into the rear suspension.  Known as squat, many systems (each unique in their own way) were invented to counter this by providing anti-squat.  These systems have been in use for the last 20 to 30 years and have rightly been celebrated for the improvement they provide to the riders experience.


But too much of a good thing is still too much.  High level's of anti squat are provided by these systems where it is needed, but for many, also where it is not needed.  


The result of excessive anti-squat can actually be the same as too little anti-squat - pedal bob.  But not in the down direction.  Instead in the upward direction!  


Riders have generally accommodated this and become used to it.

And for most good systems, the upwards shock movement is not easily discerned as only small amounts of energy are being lost.  As a result the benefits of alternative systems may not be automatically appreciated.  

However, with careful consideration, a rider is able to discern some negative effects - typically by the force required at the pedals to get the rear wheel to clear an obstacle like a ledge or root.


Testing of alternative systems in comparison with others has shown that high levels of anti squat above the sag point results in unneeded suspension EXTENSION when pedaling over flat ground.  


But what about when pedaling over bumps?  Testing has also shown that high levels of anti squat above the sag point can actually be unhelpful over bumps.  In these situations high levels of anti squat above the sag point force the suspension to extend and lift off the bump instead of absorbing it.


THESE NEW ALTERNATIVE SYSTEMS REDUCE ENERGY WASTE AND MAKES IT EASIER TO CLEAR OBSTACLES

Key Benefits

1. Removing Unwanted Suspension Extension When Pedaling

2. Improved Navigation Over Roots and Ledges When Climbing

2. Improved Navigation Over Roots and Ledges When Climbing

Anti squat (or rather the provision of it by mountain bike suspension systems) is such a great invention that riders everywhere have come to assume that the rear end standing up a bit when pedaling is the ideal.

However, this is not necessarily the case.  


We all know that the suspension compressing due to pedaling forces saps energy from the rider and directs it into the rear shock.  


But it is just the same if pedaling forces cause lifting or extension of the rear suspension system (and riders mass) as this also directs energy into the shock and away from the wheels.  Excessive anti squat at any given moment can waste energy by lifting the riders mass.


The improved systems being developed provide a different outcome.  When riding, these systems feel a lot like a hard tail - not because it feels so firm at the rear end that is actually lifts, but because it is naturally stable around the sag point.  

The system neither bobbles upwards or downwards due to pedaling forces.  It happily centers itself around the sag point.


Importantly they provides this same outcome during movement of the system above and below the sag point as the rider navigates bumps and obstacles - as chain forces collaborate with the suspension dynamics to settle back to the sag point.


Energy is saved, and the system is more stable and balanced.

2. Improved Navigation Over Roots and Ledges When Climbing

2. Improved Navigation Over Roots and Ledges When Climbing

2. Improved Navigation Over Roots and Ledges When Climbing

When they are big they can be one of the hardest obstacles to clear and take a lot of energy from the rider - getting up over roots and ledges during a climb.  Especially in a tight pinch or switch back.


With other systems, as the rear wheel reaches the obstacle, the rider increases chain tension to power over the obstacle.  At the same time this high pedaling force generates high anti squat forces which act to extend the suspension "wedging" the rear wheel between the obstacle and the riders mass.  It will typically sap forward momentum and can even stall the bike.


(This outcome can easily be experienced - just ride up to a root or ledge and stop with your rear wheel resting onto it.  Then try to pedal over the obstacle.  If you are paying attention, on most bikes, you will feel the suspension system rise up across the obstacle when you actually need it to compress to let you over the obstacle.)


With these new systems, the rear suspension is supported but not extended by chain forces when the system is operating around the sag point, so getting over the obstacle is easier.  The rider does not experience the rear wheel catching onto the root or ledge and does not feel like the bike is stalling.


The scenario above is made worse the steeper the track is or the higher the root or ledge.  In these situations the rider often tries to lift their mass up over the root.  In the process, the rear suspension of other bikes can extend into a position where it generates even higher levels of anti squat which can "wedge" the rear wheel even harder into the obstacle.  This effect compounds the problem.

In comparison, these new systems provide reduced lower anti squat  with further suspension extension which allows the suspension to compress when power is applied, and the bike to clear these obstacles with increased ease.

3. More Stable Dynamics

2. Improved Navigation Over Roots and Ledges When Climbing

3. More Stable Dynamics

The dynamic performance of the suspension system is improved in a number of ways.  Generally these relate to keeping the riders mass low and improving traction as follows:


  1. Improved traction over general bumps and uneven ground - the suspension system is not held up above the sag point by pedaling forces (and therefore holding the riders mass up) which can cause the suspension system to temporarily operating away from the normal sag point and result in unintended oscillations and loss of traction.
  2. Reduced unwanted "pop" when pedaling at speed over sharp bumps or roots - the riders weight is not lifted due to pedaling forces extending the rear suspension as it leaves the obstacle.  This allows the rear wheel to re-contact the ground sooner for increased traction and drive.
  3. Reduced lift when pedaling over undulating ground - the riders weight is not lifted due to pedaling forces when pedaling over larger undulations which can cause the suspension to unnecessarily extend off the top of the crest and loose extra wheel contact on the downside of the crest.  The bike remains calm and level instead of lifting the rider.

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