For example, if the stack height measurement on your bike was 180mm, you subtract 50mm to get 130mm. Just like you'd set up a road bike seatpost height, the height is where it is for maximum pedal efficiency and nothing else), then subtract 50mm.
#2015 TREK STACHE 7 SEATPOST FULL#
To choose the correct drop, measure from the center of saddle rail down to the top of the seat collar on the frame with the post height at the normal climbing height (This is where you are set up for full pedaling mode where your knee has a slight bend when the crank is at the bottom of the stoke. This is the distance from the top of the seatpost collar to where the seat rails would be in the saddle clamp if the post was all the way inserted in the frame. You need to know this to determine what travel length you are able to run. The length of the post that comes out of the frame is known as the stack height.
(125mm is the most common and the length about 85% of riders go with) Travel on these posts ranges from 65mm - 170mm. Depending on your stack height (mentioned later) and the insertion length, this will help you determine what the max travel of a dropper post you can run. Knowing this length of your current post will help you know if the dropper post you are considering will fit. For dropper posts, this is always measured when the post is at full extension. The overall length of most posts is measured from the bottom edge of the post to the top clamp of the cradle (where the seat rail would be). You will also need to know the length of the post. Other brands just call it "Internal routing" or some variation of that. KS calls their "Stealth" routed posts the "Integra" versions. Your frame basically has cable routing for a stealth dropper or not, you need to know this in order to get the correct post for your bike. The RockShox Reverb was one of the first dropper posts and they came out with the term "Stealth" and it has become the commonly used term even though no other brands call it that. This is becoming so common among new bikes, companies who just released a dropper post like RaceFace and Easton do not even offer non-stealth versions.
Most newish bikes have stealth routing for dropper seat posts and this is where the cable connects directly to the bottom of the post and is internally routed in your frame. Most bikes made before 2012 do not have "stealth" routing and in this case, you need this kind of cable routing on the post. Both of those are usually called "Non-stealth" since the cable is exposed and you have to route it outside the frame. You can do this by pulling your current post out and looking for the printed/engraved numbers on the post, looking online at your bikes specs, or if those two routes fail, you can take a caliper and measure the diameter that way.ĭropper seatposts come with two types of cable routing, a cable that connects to the top of the post near the clamp or at the side of the post at the bottom of its stroke. The first step to choosing your correct post would be to match the seatpost diameter to the frame’s seat tube diameter. Since dropper posts come in different travel options, different lengths, and different seat tube diameters, this is a tell-tale sign that not all dropper posts are the same and you need to find your fit before purchasing. To make sure you pull the trigger on the proper size dropper seatpost for your bike, you will need to know:ĭropper posts come in diameters of 27.2, 30.9, 31.6, and 34.9mm. Having a dropper seatpost is a huge luxury for every mountain biker.
Drop-bar Hydraulic Brake / Shift Levers.
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