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Reverb AXS Calculator

Finding the perfect dropper post length for your bike has never been easier. With just two quick measurements, the Reverb AXS Length Calculator does the work for you. With dropper lengths between 100mm and 250mm, you can find the right fit for smooth control on every ride.

Check with your frame manufacturer for seatpost diameter. Available sizes include 30.9mm, 31.6mm, and 34.9mm.

Measure your current saddle height (in mm) from the top of the seatpost clamp to the center of the saddle rails.

Check your insertion depth with your frame manufacturer or measure by inserting a tape measure down into the seat tube until it stops. The distance from the stopping point to the top of the seatpost clamp is your maximum insertion depth.