To effectively measure dropper post travel for your bike, you need to determine the maximum travel length that is suitable for your frame. Here's how:
Measuring for Dropper Post Travel
The key measurement to calculate the proper dropper post travel for you is based on the distance between the seatpost collar and the seat rail on your current bike in the highest riding position. Here's the step-by-step process:
- Measure Existing Seatpost: With your current seatpost in its climbing (highest) position, measure the distance from the top of the seatpost collar to the seat rail. This gives you the total usable space in your seat tube.
- Calculate Maximum Travel: Subtract 50mm from the measurement taken in step one. The resulting number is the maximum travel length for a dropper post that you should be using.
Understanding Dropper Travel
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Travel refers to the vertical movement of the dropper post. This movement is what allows you to lower your saddle for descents and technical riding and then raise it back to your optimal pedaling height.
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Maximum Travel means the maximum amount you can lower the seat without interfering with the bicycle frame.
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Why Subtract 50mm? The 50mm deduction ensures there's sufficient clearance and allows for a bit of extra space. This clearance accounts for the internal mechanisms of the dropper post, as well as prevents the dropper post from bottoming out inside the frame when fully extended.
Here’s an example:
| Step | Measurement |
|---|---|
| 1. Seatpost Measurement | 250mm |
| 2. Travel Calculation | 250mm - 50mm = 200mm |
| Result | Maximum Dropper Travel: 200mm |
Practical Tips
- When buying a dropper post, always check the manufacturers specs and measurements against your results.
- Frame design and seat tube angles may require a very specific calculation, always double check.
- If you're unsure or are close to a maximum travel limit, it is recommended you choose a slightly smaller travel dropper post to avoid fitment or operation issues.
By following these instructions, you will be able to calculate the appropriate dropper post travel for your bike for maximum comfort and performance.
