The ISTOS E-Dropper Post 31.6 mm revolutionizes the use of the telescopic seatpost by integrating a fully integrated electronic control into the HEPHA system. No more mechanical cables and extra levers: this electronic dropper is controlled directly from the existing remote of your electric bike, without external battery. Two travel options available — 75 mm or 125 mm — adapt perfectly to your body type and riding style, whether for urban trekking, gravel or technical descents on e-MTB.

Technical Summary

This electronic telescopic seatpost ISTOS E-Dropper stands out for its native integration into the HEPHA system: no lever, no dedicated battery, no complex wiring. Installation is plug-and-play on HEPHA models year 2026 and newer, with frames pre-wired at the factory. The rider adjusts saddle height in real time via the motor handlebar control, offering optimal ergonomics and a clean cockpit. The descent and ascent dynamics are customizable via the HEPHA app (available for P101C motors from Q2/2026), allowing you to adapt extension and compression speed to your riding style.

Available Variants

• 75 mm variant: EAN 26AC000000001 — 75 mm travel, ideal for smaller riders or frames with limited seatpost extension (Trekking 7 SE Low Step M, for example).
• 125 mm variant: 125 mm travel, offering more freedom of movement on descents and during stops in the city (Trekking 7 SE Low Step L, High Step M, and All Mountain 7 bikes).

Key Benefits

• Plug-and-play installation: On HEPHA MY26+ bikes, wiring is pre-routed at the factory. Simply connect the post, activate the function in the system, and ride.
• No external battery: The E-Dropper is powered by the HEPHA electric bike system, eliminating the need for separate charging or battery replacement.
• Integrated control: No additional lever on the handlebar — the HEPHA motor remote controls the seatpost, freeing up space and simplifying ergonomics.
• Dynamic adjustment: Adjust the speed of saddle ascent and descent according to your preferences, for maximum comfort on climbs or increased responsiveness on descents.
• Usage versatility: Designed for trekking, bike commuting, gravel and electric mountain biking, it facilitates mounting/dismounting and improves safety at traffic lights (feet flat on the ground).
• Standard 31.6 mm diameter: Compatible with most modern MTB and e-bike frames.

Travel Selection and Compatibility

The choice between 75 mm and 125 mm depends on your frame size and saddle height. Smaller riders or those on Low Step M frames will generally opt for the 75 mm, while those on L frames or High Step M can take advantage of the 125 mm to maximize freedom of movement. If in doubt, consult a HEPHA dealer or use the compatibility calculator. Minimum insertion depth is indicated by a marking engraved on the post ("Min. Insert"), ensuring safe installation in the seat tube.

Use and Maintenance

The ISTOS E-Dropper Post requires no specific maintenance related to a battery or mechanical cable. The integrated electronic system ensures long-term reliability, with no risk of cable housing wear or cable seizing. The software update to customize extension speed is accessible via the HEPHA app (models with P101C motor, from Q2/2026). For any technical intervention, contact an authorized HEPHA dealer.

Target Audience

Designed for urban cyclists, trekkers and electric mountain bikers seeking comfort, safety and ease of use, the ISTOS E-Dropper Post is particularly aimed at owners of HEPHA bikes year 2026 and later. It suits cyclists wishing to optimize their posture in any situation: frequent stops in the city, technical descents, pace changes on mixed routes. The electronic control without mechanical cable also appeals to riders who value a minimalist cockpit and effortless installation.