I was a big fan of Redshift’s original ShockStop suspension seatpost, and the new PRO RT post has the same clever parallelogram linkage design that compresses elastomer springs and moves on maintenance-free, dry-lube bushings.
However, this new iteration has been refined with a set of race-tuned, progressive-spring-rate elastomers in place of the original’s dual-spring setup.
This means you don’t need to spend time adjusting the preload and adding the second spring if you’re a heavier rider – simply plug and play.
Redshift ShockStop PRO RT specification
The PRO RT post comes in two sizes: 27.2x350mm or 27.2x280mm. Shims are available to help it fit larger-diameter seat tubes for an extra £9.99.
While the new post weighs over 130g less, my 350mm-long test post is still 412.7g, which is a lot more than a typical non-suspension post.
Redshift ShockStop PRO RT performance
The 20mm of travel you get may not sound like much, but it’s the way it delivers its movement that sets it apart from other suspension posts.
The saddle falls back when you hit something big, and the spring rate is stiff enough that you don’t bob when you’re hammering on the pedals. However, it still smothers vibrations to stunning effect.
If you suffer from fatigue on bad roads and lumpy gravel, the PRO should keep you fresher for longer.
I’ve run it on both a rigid gravel bike and on a bike with a (gravel) suspension fork, and the effect on both was transformative.
On my rigid bike, it felt like I was running a big, high-volume tyre on the back, when it was a modest 38mm.
On the fork-equipped bike, it balanced perfectly with the 30mm of travel up-front, enabling me to ride faster for the same comfort level.
Redshift ShockStop PRO RT bottom line
The PRO RT post is well put together and is amazingly comfortable. The magnetic-fixing mudguard cover to stop gritty mud spray roughing up the linkage is a smart touch.
In all, the new PRO RT is a winner, killing vibrations and nulling big hits, plus it’s lighter and simpler to use than the old design.