WE DESIGN SUSPENSION SYSTEMS TO
IMPROVE YOUR MOTORBIKE’s FRONT FORK
NEWS !
We have developed a new kit for Classic Trial: HFS EXPERT mk2
More simple with very good performance. You can find more information here
HFS (Hybrid Fork Suspension) is a PROGRESSIVE SUSPENSION SYSTEM for non USD forks. The objective is to obtain a progressive response curve (stiffness). We have 3 possibilities for improving the original suspension: progressive in 2 stages (CLUBMAN), progressive in 3 stages (EXPERT mk2) and countinously progressive (EXPERT and PRO).
HFS improves motorbike’s original suspension. It is soft at the beginning, being soft at the beginning and reading the track quite well, and it is getting stiffer progressively avoiding suspension bottoming or an excessive dive in braking.
HFS has an influence only in the ‘elastic’ part of suspension: hydraulic damping is not modified. HFS combines action of different springs connected in serial. En the case of kit PRO and EXPERT, one of the components is an air cartridge, acting in serial with an helicoidal spring.
due to the fact that air has a progressive behaviour, result is a truly progressive suspension that filters terrain quite efficiently and is getting stiffer as fork travel increases.
HFS is adjustable. Adjustment is performed through pressure setting in air cartridge (PRO and EXPERT) or with mechanical pre-load (CLUBMAN and EXPERT mk2). It is done depending on rider’s weight or his riding preferences. Riders with bigger weight will apply more pressure than lighter ones. With this, “static sag” will be optimal for both riders, being able to utilize all suspension travel regardless of his weight, for instance.
HFS does not alter the motorbike structurally, as it is dropped into the original stanchions. Original damping system also remains unaltered.
HFS has been designed to achieve a progressive behaviour in the front suspension. System has following basic characteristics:
– Adjustable, adapting to rider’s characteristics and riding preferences.
– It reads the track in a progressive way.
– Higher bottoming resistance in case of severe impacts.
– Easy to install.
– Easy to set up.
– It does not have a periodic maintenance.
– It does not alter structural desing by motorbike’s OEM.
We offer a reliable product, settable, easy to install, providing a remarkable improvement in your motorbike’s performance, without altering manufacturer’s original geometry.
Dotted line represents the original suspension, and the coulor ones, HFS Kit response repending on the different versions.
Remarkable aspects:
– Starting point represent the initial set-up (pre-load).
– Approximately in the fork´s travel first half, the curve shows a softer response, that can be translater into a better reading of the terrain.
– From that point, HFS response increases progressively showing a greater stiffness, helping to avoid suspension bottoming.
Practical result of these two zones of HFS suspension response curve are the following:
– A better filtering and “reading” of loose rocks, potholes, bumps, dubbies, as well as a safer breaking
– When it is needed to absorb a big impact, HFS system has a higher limit than the motorbike´s original one.
In the following figure it is shown the 4 different Kit types, and its components. Important: the the case of EXPERT and PRO, a Pump is needed to pressurize the air cartridge. In the case of CLUBMAN and EXPERT mk2, it is NOT needed a pump as all set-ups are made mechanically.
In previous figure it is shown a conventional system and HFS. IT is important to remark that HFS system affects only to suspension’s “elastic” part; “Hydraulic” (or damping) part is not modified. Original components such as upper cap, spacers, spring, are substituted by a specials springs (in all cases) and an air cartridge that is pressurized with a manual pump (in case of EXPERT and PRO).
Materials used are high quality and HFS system has two years warranty for manufacturing defects.
This design provides quite high performance to from motorbike’s suspension, that is not possible to achieve with conventional solutions. With HFS it is improved performance of both off-road and on-road experiences, with suspension absorbing quite well track imperfections and progressively getting stiffer to have higher bottoming limit with severe utilization (thanks to its working principle and its set up possibilities).
In classic motorbikes range (Trial, Motocross and on-road speed racing), valve in upper cap is hidden in order to respect its vintage aspect, and at same time providing a huge improvement in its performance, all in a natural manner.
To set up pressure, it is simply a matter of unscrewing the small screw and valve threaded to main upper cap will be accessible.
HFS Expert version for Classics Trial motorbikes has in one of both legs a two spring system in which it can be set up the point of higher spring stiffness by simply inserting a spacer in one way or another. You can see details in ‘product’ tab.