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DMS suspension

Unfortunately DMS is out of business but a lot of their suspension are still in use. This page tries to gather as much information as possible to help people maintain their DMS suspension.
There are different kinds of DMS coilovers, some with 40mm inserts and others with 50mm inserts. Most of the information on this page relates to the DMS 50mm gravel coilovers.


The video below will walk you through the install of DMS 50mm coilovers on an 04 Subaru STi.

DMS suspension install and setup

We also recommend using socks/covers to protect the coilovers from dirt/sand/water that can produce corrosion or damage seals. We recommend using SealSavers ProSeries Coil Savers size 2.0-2.5 (see video below). they come in pair so you will need 2 to cover the 4 shocks. You can find them at
The Outerwears sock covers don't really hold up do rally duty (for DMS shocks use

SealSavers ProSeries Coil Savers


  • Redline CV-2 wheel bearing grease
  • Seals: SKF 19590
  • Bushings: SKF PCM 505540 M
  • Bump stops can be sourced from
  • New strut bodies: check with Fercomp USA, Samsonas strut bodies will fit DMS 50mm inserts
  • New inserts: pretty much any 50mm inserts should fit (Bilstein, Samsonas, etc...)

Regular maintenance is key, usually just an annual regrease and seal inspection is enough as shown in the following video.

DMS basic service

When you start to observe some play in the coilover, the first cause might be the strut housing unthreading from the bottom mount (see next video). 

DMS play in bottom mount

After a while the bushings inside the strut body will wear and will cause some play between the insert and the housing. The video below walks you through the bushing replacement procedure:

DMS bushing replacement

Reading the spring rates
Four types of spring winds:

KST (tarmac, or when ride height is needed)
MG (street, tarmac)
DP (gravel, some street)
OEM fitment

General guidelines, not written in stone.


350 = spring length
FL = FREE LENGTH OF SPRING (goes with 350)

ALSO can have something like this

Numbers mean the same thing, different order.