Best method: Use a pair of calipers to directly measure the diameter or take your bike to the local bike shop and they will be able to measure it for you. I’ve only gotten four or five rides in with the new Thudbuster, but I’m quite impressed. The redesigned seat clamp is fantastic, and I found the new elastomer system to work very well. Unlike some of the softer, coil-sprung posts, the new Thudbuster offers a nice mix of chatter dampening and medium-hit suspension to take the edge off of sharper bumps. And, it doesn’t feel as if it has as much of an effect on pedaling efficiency as other, longer travel posts do. But interestingly, data recently collected by the University of Exeter (England) suggests that once the seatpost is installed on a bike, it may not reduce vibration exposure.

These seatposts are particularly active or ‘bobby’ in the initial part of their travel, so they tend to be better suited to rougher trails, rather than smoother roads – in my experience. Continuing their 20-year suspension seatpost legacy, Cane Creek recently announced the all-new, fourth generation Thudbuster ST (Short Travel). Designed with touring, commutes, and e-bike trips in mind, it features 50mm of travel—up from 33mm on the original Thudbuster ST—to smooth out bumps and bounces on multi-surface rides. Building on the original Thudbuster’s parallel linkage, it also got a redesign for a higher rider weight limit (now up to 330 pounds), increased durability, and more travel. In addition, linkage posts ensure that the saddle-to-pedal distance is (mostly) maintained when the seatpost is compressed. Telescopic seatposts move in a different plane to bump forces coming up from the rear wheel.Many of the popular models of dropper posts used on mountain bikes don’t work perfectly unless they’re setup correctly and well maintained. Fortunately, the RedShift post is far simpler and works smoothly every time with no special setup or care needed. This is simply due to the higher percentage of weight on your saddle. Conversely, if you have more weight on your hands because you ride in a more sporty position, you can get away with less suspension travel. Best Suspension Seatposts Coil Sprung Damping determines the speed at which a seatpost will move over repeated bumps. A seatpost that dampens vibrations effectively will help to insulate you from road buzz coming up through your bike. The By.schulz G.2 is a very highly-rated seatpost. There is a short-travel version with 30mm, and a long-travel version with 50mm of suspension. Unexpectedly, using the RedShift seatpost made me realize how often I grab the saddle when maneuvering my bike by hand. When grabbing the bike by the saddle, at first the saddle alone moves instead of the complete bike, which felt odd until I learned how to compensate for it or grabbed the bike somewhere else.

It’s great if you have a ‘sporty’ ride position like me, or if you mostly ride smoother roads. Given it only has 20mm of travel, you will have to compromise on the rougher roads, but I still find it offers a significant comfort improvement over a regular post. Plus it doesn’t bounce, it’s light and it’s elegant. The easiest way to reduce this movement is to adjust the spring pre-load – or the amount of force required to cause the saddle to start moving. This will stop the saddle bob, but will also reduce the seatposts ability to take the edge off small bumps. But the key difference to a carbon post is that the spring rate isn’t determined by how much exposed seatpost you have, allowing you to tune it perfectly to your body weight, using the five different elastomers available.With the knowledge that my tyre volume and pressure could cope with the sort of impacts I normally try to avoid, I steered towards the roughest patches of tarmac, potholes, ancient cobbles and uneven gravel. Saddle moves forward 50mm, corresponding to approximately 4 degrees of effective seat tube angle change Its simple, unobtrusive performance impressed me enough that I mounted the CF Allroad Pro Seatpost to my Unbound race bike. You can measure the length of your existing stem as shown in the following picture. The length is measured from the center of the handlebar to the center of the steerer tube. I have one. It’s the best suspension seatpost I’ve used to date (I’ve no experience with the Kinekt, but have had Cane Creek Thudbuster LTs on 3 or 4 of My bikes, 2 Thudbuster STs (still have one); a by.Schultz LT 2.0; ridden a SunTour on girlfriend’s bike and cheap rubbish PostModern as a novice rider over 20 years ago). Below are My observations: