The ISTOS E-Dropper Post 31.6 mm electronic telescopic seatpost revolutionizes the e-bike experience by combining wireless electronic control, full integration with the HEPHA system and plug-and-play installation. Designed for HEPHA electric bikes from the 2026 model year onwards, it offers 75 or 125 mm of travel adjustable instantly, without mechanical cable, without dedicated battery and without additional handlebar lever.

Technical Overview

The ISTOS E-Dropper abandons traditional cable-operated mechanical solutions in favor of integrated electronic control. It connects directly to the HEPHA system and uses the bike's onboard battery — no external power source is required. Available in two versions (75 mm and 125 mm travel), it meets both urban needs (curb climbs/descents, frequent stops) and off-road riding (aggressive descents, rapid position changes). The 31.6 mm diameter (compatible with HEPHA 31.8 mm) guarantees native compatibility with all recent HEPHA frames.

Design Highlights

• Total system integration: Operates via the existing HEPHA remote control, without adding any lever or component to the cockpit. Wiring is pre-installed at the factory on MY26 models.
• Dual travel: Two variants available — 75 mm (500 g) for urban and light trekking, 125 mm (585 g) for off-road and demanding riding.
• Adjustable activation dynamics: Extension and retraction speed is customizable according to riding style. On bikes equipped with the P110 motor, adjustment is made directly via the HEPHA app.
• Plug-and-play installation: On MY26 frames, cables are pre-routed internally. Simply slide in the post, connect it and lock it — no specific tools or cable routing required.
• Reliability and protection: IP65 rated, it resists dust, water spray and harsh conditions. Maximum rider load: 120 kg. Usage category 4 (all-mountain, enduro).

Available Variants

• 75 mm variant: EAN 4255906500000 / Manufacturer reference 26AC000000001 / Weight 500 g / Ideal for trekking, city and daily use
• 125 mm variant: Weight 585 g / Designed for off-road riding, technical descents and all-mountain

Compatibility and Retrofit

The ISTOS E-Dropper post is compatible with all HEPHA electric bikes from the 2026 model year onwards, equipped with P101C or P110 motors. MY24/MY25 frames can already integrate the post at the factory, but wiring is not systematically pre-installed. For MY26 models, retrofit is simplified: all routing points and connectors are in place. Minimum insertion depth required: 150 mm.

Geometry and Ergonomics

With a diameter of 31.6 mm (HEPHA seat tube 31.8 mm), the post ensures precise fit and optimal rigidity. The two travel options (75/125 mm) allow lowering the center of gravity on technical descents or quickly raising the saddle for efficient pedaling phases. The electronic system guarantees instant, smooth activation without physical effort — a decisive advantage on rough terrain or in dense urban environments.

Use and Control

Control is via the HEPHA system remote control, already present on the handlebar to manage motor assistance. A clean cockpit, intuitive control and immediate responsiveness: the ISTOS E-Dropper transforms every stop, turn or technical section into a natural gesture. Customization of activation speed (via HEPHA app on P110 motor) allows adapting the post's behavior according to rider preferences — fast deployment for sporty descents, gentle extension for urban comfort.