1. Select Diameter
2. Your Ride Height
Distance from seat clamp to saddle rails at your ideal pedaling position.
3. Your Insertion Depth
Maximum distance from seat clamp to any obstruction in your frame.

Want to know how long of a dropper you can fit on your bike? With two simple measurements our Dropper Post Length Calculator will tell you.
STEP 1 - Measure Dimension X. This is your current saddle height. It is the distance from the top of the seatpost collar to the middle of the saddle rails.
STEP 2 - Measure Dimension Y. This is the your insertion depth. It is the distance from the top of the seatpost collar to an obstruction in your frame. Measure this distance by inserting a rigid post or tape measure into your frame until it hits an obstruction.
Once you have your insertion depth, you should reduce measurement by 10-15mm to ensure fitment. Depending on the frame design, inserting the dropper at the max depth may cause tight/sharp cable routing, which does not allow for proper dropper post actuation/function.
OneUp dropper posts can all be shimmed by 10-20mm. If a length appears in brackets below your dropper post suggestion, you'll need to shim the post to that length using the included travel pins. Learn more about how to shim your dropper post.
Distance from seat clamp to saddle rails at your ideal pedaling position.
Maximum distance from seat clamp to any obstruction in your frame.
Enter your measurements above to see which post will fit you and your bike.
Cette vidéo vous montre comment utiliser le calculateur de tige de selle télescopique OneUp pour trouver la tige avec le plus grand débattement possible pour votre vélo. Vous apprendrez à vérifier le diamètre de votre tige de selle et à prendre deux mesures essentielles.
Vous voulez une description plus détaillée ? Consultez notre guide complet en version texte : Comment savoir quelle tige de selle télescopique convient à votre vélo.