RockShox on Instagram: "Finding the perfect dropper post length for your bike has never been easier. Just confirm your seatpost diameter, take two quick measurements, and let the Reverb AXS Calculator do the rest. Here’s what to measure: 1. Saddle height — from the top of the seatpost clamp to the center of your saddle rails (in mm) 2. Maximum insertion depth — check your frame specs or measure by inserting a tape measure down the seat tube until it stops. The distance from the stop point to the