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Sprindex's adjustable coil shocks

Sprindex system means that one coil is all you need
Sprindex produces high-quality coil springs with a special adaptor ring, which amplifies or calms the spring rate
(Image credit: Sprindex)

Sprindex is an innovative solution to one of dual-suspension mountain biking’s great annoyances.

There is no question that coil shocks have benefits compared to an air-damper. With less friction and required maintenance a coil can ride plusher, in the harshest terrain, than air-sprung suspension. It also has the benefit of fade-free performance, as there is no air to heat and degrade damping on a long descent.

Coil springs have one fundamental weakness and that is the lack of adjustability. If you wish to alter the characteristics of your coil spring’s performance, within the parameters of any dual-suspension frame’s kinematics, you need to buy a new spring.

Swapping springs can be costly and annoyingly laborious, compared to the more convenient operation of an air shock. If you require a different spring rate from an air shock, you simply add or releasing air pressure.

Enter the Sprindex. It promises to deliver a previously unimaginable blend of adjustability and convenience of performance, for coil shocks.

Sprindex coils feature a simple but effective way of managing overall mechanical performance. The Sprindex system has a Delrin adaptor, with treads which are the size of the spring’s coil diameter.

By turning the adaptor ring, you envelope more or less of the coil, thereby increasing or reducing its spring rate. It is a simple but effective mechanical system.

Sprindex’s product planners are mindful of coil shocks now being used on a greater assortment of dual-suspension trail mountain bikes than ever before. To ensure a comparable solution for each riding discipline, they are offering their adjustable coil shock system in three stroke lengths.

For cross-country or trail riders, there’s a 55mm version, whilst a larger 65mm stroke length caters for enduro bikes. The traditional preserve of hardcore coil shocks, downhill racing, is serviced by a 75mm version of the Sprindex. There are also contact adaptors to ensure that your Sprindex coil work with a diversity of shocks, from most manufacturers.

Recommended retail is $140, which is a lot less of an investment than buying two or three individual coils, with different spring rates. 

Lance Branquinho is a Namibian-born media professional who graduated to mountain biking after injuries curtailed his fascination with trail running. He has a weakness for British steel hardtails, especially those which only run a single gear. Rides: Morewood Kwela Cotic Simple 26 Pyga 160mm aluminium prototype