Shop the best in MTB Adjustable Seatposts by  FOX, PNW, Bike Yoke and OneUp Components.

Need help sizing the right adjustable post? No problem, jump down for tips on Sizing Adjustable Seatposts.
Scroll down for a size comparison of FOX Transfer, PNW Loam & Rainer Gen 3, Bike Yoke Revive 2.0 and OneUp Dropper V2 posts.
Need a quick refresher to install your dropper post? No problem we have a video below the product for that as well.

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Compare Adjustable Seatpost Sizing

Seatpost Dimension Diagram
Measurements in MM
Travel Collar to Rails Total Length Max Insertion Min Insertion
FOX Transfer 200 238.9 530.7 291.8 150
FOX Transfer 175 213.2 475.1 261.9 100
FOX Transfer 150 188.2 418.3 230 100
PNW Loam 200* 250* 540 290 145
PNW Loam 170* 220* 480 260 120
PNW Loam 150* 200* 440 240 190
PNW Rainier Gen 3 200* 255* 555 300 180
PNW Rainier Gen 3 170* 225* 493 268 150
Bike Yoke Revive 2.0 213 255 582 327 130
Bike Yoke Revive 2.0 185 227 517 290 130
Bike Yoke Revive 2.0 160 202 467 265 100
OneUp Dropper V2 210* 243* 540 297 150
OneUp Dropper V2 180* 213* 480 267 120
OneUp Dropper V2 150* 183* 420 237 90
* PNW & OneUp posts have adjustable travel options

Adjustable Seatposts

The best MTB Adjustable Seatposts are available in a range of sizes to maximize available travel for any size frame and rider. Leading posts from FOX, PNW and OneUp are also reliable and easy to install.

FOX Transfer Dropper Post

FOX Transfer seatposts are available in two models. Factory Transfer posts feature FOX’s gold Kashima coat  to match their Factory fork and rear shocks. Transfer Performance models have a hard black ano coating for a stealth look.

FOX Transfer posts are available in 30.9 and 31.6mm in the popular travel sizes of 150mm, 175mm and 200mm.

PNW Loam Dropper Post

The PNW Loam Dropper features the ability for finite adjustments to total travel, quickly and without special tools! This allows riders to “up-size” post travel and then adjust down to maximize their exact fit. PNW Loam Adjustable Seatposts are available in three travel lengths: 150, 170 and 200mm.

The Loam seatpost also has interchangeable colored bands to match your bike’s accent color. Pair this with the PNW remote pad and you can dial in the perfect color combos.

OneUp Dropper V2

OneUp Components Dropper V2 is a popular, cost conscious option as well as packed with design features for the best fit.

Like the PNW Loam the OneUp seatpost can have its travel limited to fine tune exact fit. This allows riders to purchase a slightly longer post than would fit and then reduce the travel with the OneUp shims for maximum available travel length.

OneUp’s V2 Dropper also utilizes a compact design to minimize the insertion depth at each size.  Riders choose from 150, 170 and a 210mm travel option.

Determining Dropper Post Sizing

Many riders have questions on what size adjustable post they need. Well it’s not too hard to get into the right dropper post sizing with a bit of info. Check out the quick video and writeup to help you get the right adjustable seat post travel for your riding.

Sizing your Adjustable Seatpost

Learn how to best size an adjustable seatpost for your mountain bike.

To get your adjustable seatpost length correct you need a couple measurements from you the rider as well as the bike. Once you have these measurements you can compare seatpost models and sizes to get the perfect setup.

Sizing an Adjustable Seatpost

Measurements Needed for Sizing the Post

On the image above we show the required measurements in black text. They are Rider Inseam, Pedal to Frame Collar Dimension and Saddle Rails to Seating Surface measurement.

How to measure Inseam length for dropper post sizing:

Stand near a wall. Then take a ruler, or broomstick or whatever and get it up right all the way up where your legs come together. Make sure the broomstick or whatever is level, you know, a level works good for this. Use a level if you can.

Then mark on the wall the top of the level. You can easily measure down to the floor to get your inseam without owning anyone a really personal favor.

Continue measuring the Bike

Measure the bike from the top of the pedals to the top of the frame collar. Then measure the saddle rails to seating surface.

Subtract these measurements from your inseam and you’ll have a pretty good idea of how much room you have to work with your adjustable post.

It is highly recommended to leave some “wiggle” room between the frame collar and seatpost collar. This allows you to make small decreases in saddle height to fine tune your fit. Another option is to use the PNW or OneUp seatposts with travel adjust to get the maximum travel for your height.

The last factor is to ensure that your frame has appropriate room for the seatpost. Check the maximum insertion on the frame and compare it to your “actual” measurement (bottom of collar to bottom of post subtracting the “wiggle” room).

Got it? Jump back and shop for the best dropper posts in MTB on!

If you have any questions on sizing your dropper post let us know and we can present some options that will work for your size, riding style, frame,etc.

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