Dropper Fitment

How to find the proper dropper

With the 2019 GG Modular Frame Platform, riders have more freedom than ever to run the dropper post length of their choosing. Below you’ll find details on selecting the dropper post length that will work with your body measurements (scroll down for a reference to use your existing bike).

Just want to go ride? Here’s your quick cheat sheet of the general recommendation based off your pants inseam:


Pants Inseam (inches)*
Dropper Length Frame Size 2 Frame Size 3 Frame Size 4
100 mm 24" - 29" 26" - 30" 28" - 33"
125 mm 26" - 30" 27" - 32" 29" - 34"
150 / 160 mm 28" - 32" 29" - 34" 30" - 36"
170 / 185 mm 29" - 32" 30" - 34" 32" - 36"
200 mm 32" - 34" 33" - 36" 34" - 38"

* Using your pants inseam is the least precise way to measure your dropper post fitment. This will get you in the ballpark of what may fit but isn’t as accurate as measuring your saddle height. So, if you’re on the edge of the inseam recommended for your desired dropper travel, opt for the more precise way.

The most precise way to measure your dropper post fitment Is by using your existing bike:

  1. Use the Fit Calculator to find the correct sized frame for your height and riding style.
  2. Grab your tape measure and your old bike.
  3. Measure the straight-line distance from the center of the bottom bracket to the saddle rails (not the top of the saddle), write this number down.
  4. Compare this measurement to the charts below to see which dropper will fit best.

Everyone has different fit preferences and things like your pedal choice, crank length, and physiology can heavily affect saddle height and dropper post fitment. If you’re on the razor’s edge for any of these measurements, get in touch with us so we can confirm fitment on your new bike.


SDG Tellis

Straightline Distance, center of BB to saddle rails (mm)
Dropper Length Frame Size 2 Frame Size 3 Frame Size 4
100 mm 555 - 660 585 - 690 635 - 740
125 mm 580 - 710 610 - 740 660 - 790
150 mm 627 - 753 647 - 783 687 - 833
170 mm 667 - 800 687 - 830 727 - 880
Straightline Distance, center of BB to saddle rails (in)
Dropper Length Frame Size 2 Frame Size 3 Frame Size 4
100 mm 21.9 - 26.0 23.0 - 27.2 25.0 - 29.1
125 mm 22.8 - 28.0 24.0 - 29.1 26.0 - 31.1
150 mm 24.7 - 29.6 25.5 - 30.8 27 - 32.8
170 mm 26.3 - 31.5 27.0 - 32.7 28.6 - 34.6

BikeYoke Revive

Straightline Distance, center of BB to saddle rails (mm)
Dropper Length Frame Size 2 Frame Size 3 Frame Size 4
160 mm 602 - 735 632 - 765 682 - 815
185 mm 645 - 735 665 - 765 707 - 815
Straightline Distance, center of BB to saddle rails (in)
Dropper Length Size 2 Size 3 Size 4
160 mm 23.7 - 28.9 24.9 - 30.1 26.8 - 32.1
185 mm 25.4 - 28.9 26.2 - 30.1 27.8 - 32.1

Rockshox Reverb AXS

Straightline Distance, center of BB to saddle rails (mm)
Dropper Length Size 2 Size 3 Size 4
170 mm 634 - 798 664 - 828 714 - 878
Straightline Distance, center of BB to saddle rails (in)
Dropper Length Frame Size 2 Frame Size 3 Frame Size 4
170 mm 25.0 - 31.4 26.1 - 32.6 28.1 - 34.6