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Lots of questions - What brand is that Ti spring?
What size is it? What does it weigh? There's no denying phat Ti springs with wider coil spacing look sooo much better than all other steel springs.@BareNecessities I run the ext arma on my dh bike and have just got another for my nomad. The hydraulic bottom out control really is great.
Its especially good if you run one on a trail bike, you can get away with running a slightly softer coil and not worry about blowing through to a harsh bottom out.
The rrp is a hard pill to swallow but does include two coils.
Both mine are second hand, mojo know this and sorted out leaky seal on one under warranty as if I was the original owner. I've heard of other having that same experience too.
A normal coil spring has a linear rate - the bike needs a progressive kinematic to provide the bottom-out resistance. Bikes designed for air shocks can have linear or even digressive curves to take into account the increasing rate of an air spring.
Bigger aftermarket air cans exist to make air springs play nicely with progressive bikes.