What does 220/100 valving on the Bilstein RSR struts mean?

What does 220/100 valving on the Bilstein RSR struts mean?

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[Nick at Pelican Parts]

Here is some info on Bilstein valving.

Understanding Bilstein Valve Ratings
Damping forces of Bilstein valvings for Off-Road are measured in Newtons at a velocity of 0.52 meters/seconds (approximately 20 inches/second). The ratings shown correspond to those measurements; rebound force is the first number, followed by compression force (rebound / compression). Conventionally, the ratings are written as one tenth the damping force in Newtons.
EXAMPLE: Valve rating: 275 / 78
Rebound force is 2750 Newtons at 0.52 m/s
Compression force is 780 Newtons at 0.52 m/s
Higher numbers mean higher (firmer) damping forces. For example, 360/80 has more control (is firmer) that 275/78, while 170/60 has less control (is softer) than 275/78.
For valving recommendations please refer to the Valving Guide.
Determining how many shocks to put on a vehicle.
A shock absorber transforms mechanical energy (suspension movement) into kinetic energy (heat). If a shock absorber builds up too much heat, it will not function properly. Shock absorbers exposed to excessive heat will fade (soften) or fail.
If you are experiencing excessive shock failure or fading, it may be time to add another shock.
By adding another shock, you are spreading the work load from one shock to multiple shocks. Increased cooling capability will be achieved from the following factors:
Decreased Friction
Dampening causes friction. When you use a multiple shock set up, lighter valved shocks can be used which will decrease friction.
Increased Oil Capacity
The more oil, the better. Higher oil volumes take longer to heat.
Other methods to consider which will increase oil capacity are to utilize a remote reservoir or to use a larger diameter shock.

- Nick