ISTOS E-Dropper Post HEPHA E-Bike
ISTOS E-Dropper Post HEPHA E-Bike
ISTOS E-Dropper Post HEPHA E-Bike

ISTOS E-Dropper Post

ArtNo. 26AC000000001
€259,00

This electronically controlled seatpost offers 75 or 125 mm of travel and is seamlessly integrated into the HEPHA system. It requires neither its own battery nor an additional lever and can be operated quickly and ergonomically via the handlebar remote control.

Shipping Time: 3-10 working days

Delivery Period: 3-10 working days

Choose from the following travel
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Easy to get on and off. Comfortable & safe.

The ISTOS E-Dropper replaces conventional mechanical cable solutions with electronic control. With an adjustment range of 75 or 125 mm, you can quickly and precisely adjust your saddle height to the terrain and riding situation – giving you more freedom of movement on descents and making it easier to get on and off your bike in the city. As the dropper seat post is fully integrated into the HEPHA system, it requires no separate battery or additional controls on the handlebars. It is operated via the existing remote control, keeping your cockpit clear and tidy. The release dynamics can be individually adjusted so that the speed at which the seat post extends or lowers matches your personal riding style. For the rider, this means clean integration, easy handling and maximum freedom of movement – without any additional components.

The ISTOS E-Dropper Post can be retrofitted to all HEPHA e-bikes from model year 2026 onwards, as the cables are already neatly pre-installed in the frame ex works. On bikes with a P110 motor, you can adjust the activation speed via the HEPHA app.



  • Electronically controlled
  • Seamlessly integrated into the HEPHA system
  • No additional battery/lever required
  • Slow and fast activation speed
  • Easy to retrofit: Plug-and-play

Easy to hop on, safe to ride.

One click and the saddle is at the right height. Magic? Technology.

Highlights

Standing safely at the traffic light

A dropper seatpost makes getting on and off the bike much easier. A lowered saddle is especially helpful when stopping at a traffic light or making a sudden stop, as it allows you to stand securely with both feet on the ground.

Adjust the saddle height while riding

Sitting in exactly the same position on your bike for long periods of time can lead to problems. Thanks to its stepless adjustment, the E-Dropper lets you adjust your seating position in small steps. This helps prevent seating issues and back pain – especially on long rides.

Fast and smooth handling

The E-Dropper seatpost is controlled via the existing remote, keeping your cockpit clean and uncluttered. Thanks to the electronic control system, the seatpost lowers quickly, reliably and with minimal effort.

Easy to retrofit: Plug & Play

Since the E-Dropper seatpost is fully integrated into the HEPHA system, it requires neither a separate battery nor an additional controller. It can be easily retrofitted to all 2026 HEPHA e-bikes, as the cable is already pre-installed in the frame ex works.

Slow & fast activation speed

The release dynamics can be individually adjusted via the HEPHA app (available for P110 motor). This way, you can be sure that the speed at which the seat post extends or lowers matches your personal riding style.

Specification

Diameter
31.8mm
Weight
500 g (75 mm) / 585 g (125 mm)
Max. rider weight
120 kg
Min. insertion depth
150 mm
IP rating
IP65
Application category
Category 4

FAQ

Yes, basically all dropper seat posts can be retrofitted. However, with mechanical dropper posts, a cable must first be routed through the frame to activate the mechanism, which is a very labor-intensive process. Be sure to contact a HEPHA dealer for this.
Alternatively, we offer the ISTOS E-Dropper Post. It is electronically activated and is directly integrated into the HEPHA drive system. Installation is particularly easy, as the cable is already pre-routed on all 2026 models: just plug it in, activate it, and you’re good to go.

The main difference lies in the travel, i.e., the saddle’s drop distance. The longer travel provides more legroom on descents and even greater comfort when mounting and dismounting. Which length fits your bike depends entirely on your frame and seat height. Riders with limited saddle extension will likely need to opt for the shorter version. If in doubt, contact a HEPHA dealer.

No, trekking and city cyclists also benefit from a lowered saddle. A dropper seatpost not only makes getting on and off the bike easier, but also makes short stops safer, as you can stand firmly on the ground with both feet.

The E-Dropper has a diameter of 31.8 mm and therefore fits all HEPHA e-bikes.

No. The electronically controlled seatpost is directly integrated into the HEPHA system and requires neither its own battery nor an additional lever. It can be conveniently operated using the system remote control.

The minimum insertion depth indicates the minimum distance the seatpost must be inserted into the frame’s seat tube. The E-Dropper has a marking line (“Min. Insert”) for this purpose. This line must no longer be visible when the seatpost is inserted into the frame.

Measure your inner leg length while wearing shoes, then check your frame size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

All Mountain 7 Alloy
Full Suspension
Inner leg length S (40 cm)M (44 cm)L (48 cm)
≤ 69 cm
70 cm 75 mm
71 cm 75 mm
72 cm 75 mm
73 cm 75 mm
74 cm 75 mm 75 mm
75 cm 75 mm 75 mm
76 cm 75 mm
77 cm 75 mm
78 cm 125 mm 75 mm 75 mm
79 cm 125 mm 125 mm 75 mm
80 cm 125 mm 125 mm 75 mm
81 cm 125 mm 125 mm 75 mm
82 cm 125 mm 125 mm 75 mm
83 cm 150 mm 150 mm 125 mm
84 cm 150 mm 150 mm 125 mm
85 cm 150 mm 150 mm 150 mm
86 cm 150 mm 150 mm 150 mm
87 cm 150 mm 150 mm 150 mm
88 cm 150 mm 150 mm 150 mm
89 cm 150 mm 150 mm 150 mm
90 cm 150 mm 150 mm 150 mm
91 cm 150 mm 150 mm
92 cm 150 mm 150 mm
93 cm 150 mm 150 mm
94 cm 150 mm
95 cm 150 mm
96 cm 150 mm
97 cm 150 mm
≥ 98 cm

Measure your inner leg length while wearing shoes, then check your frame size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

All Mountain 7 Carbon
Full Suspension
Inner leg length M (44 cm)L (48 cm)
≤ 73 cm
74 cm 75 mm
75 cm 75 mm
76 cm 75 mm
77 cm 75 mm
78 cm 75 mm 75 mm
79 cm 75 mm 75 mm
80 cm 125 mm 75 mm
81 cm 125 mm 75 mm
82 cm 125 mm 75 mm
83 cm 125 mm 125 mm
84 cm 125 mm 125 mm
85 cm 150 mm 150 mm
86 cm 150 mm 150 mm
87 cm 150 mm 150 mm
88 cm 150 mm 150 mm
89 cm 150 mm 150 mm
90 cm 150 mm 150 mm
91 cm 150 mm 150 mm
92 cm 150 mm 150 mm
93 cm 150 mm 150 mm
94 cm 150 mm
95 cm 150 mm
96 cm 150 mm
97 cm 150 mm
≥ 98 cm

Measure your inner leg length while wearing shoes, then check your frame type and size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

City 7
High Step Low Step
Inner leg length M (50 cm)L (55 cm)XL (60 cm)S (45 cm)M (50 cm)L (55 cm)
≤ 75 cm
76 cm 75 mm
77 cm 75 mm
78 cm 75 mm
79 cm 75 mm
80 cm 75 mm
81 cm 75 mm 125 mm 75 mm
82 cm 75 mm 125 mm 75 mm
83 cm 75 mm 150 mm 75 mm
84 cm 75 mm 150 mm 75 mm
85 cm 75 mm 150 mm 75 mm
86 cm 125 mm 75 mm 150 mm 125 mm 75 mm
87 cm 125 mm 75 mm 150 mm 125 mm 75 mm
88 cm 150 mm 75 mm 150 mm 150 mm 75 mm
89 cm 150 mm 75 mm 150 mm 150 mm 75 mm
90 cm 150 mm 75 mm 150 mm 150 mm 75 mm
91 cm 150 mm 125 mm 75 mm 150 mm 150 mm 125 mm
92 cm 150 mm 125 mm 75 mm 150 mm 150 mm 125 mm
93 cm 150 mm 150 mm 75 mm 150 mm 150 mm 150 mm
94 cm 150 mm 150 mm 75 mm 150 mm 150 mm 150 mm
95 cm 150 mm 150 mm 125 mm 150 mm 150 mm 150 mm
96 cm 150 mm 150 mm 125 mm 150 mm 150 mm
97 cm 150 mm 150 mm 125 mm 150 mm 150 mm
98 cm 150 mm 150 mm 150 mm 150 mm 150 mm
99 cm 150 mm 150 mm 150 mm 150 mm 150 mm
100 cm 150 mm 150 mm 150 mm 150 mm 150 mm
101 cm 150 mm 150 mm 150 mm
102 cm 150 mm 150 mm 150 mm
103 cm 150 mm 150 mm 150 mm
104 cm 150 mm 150 mm 150 mm
105 cm 150 mm 150 mm 150 mm
106 cm 150 mm
107 cm 150 mm
108 cm 150 mm
109 cm 150 mm
110 cm 150 mm
≥ 111 cm

Measure your inner leg length while wearing shoes, then check your frame type and size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

City 8
High Step Low Step
Inner leg length M (45 cm)L (47 cm)XL (52 cm)M (42 cm)L (47 cm)XL (52 cm)
≤ 72 cm
73 cm 75 mm
74 cm 75 mm
75 cm 75 mm
76 cm 75 mm 75 mm
77 cm 75 mm 75 mm
78 cm 75 mm 75 mm 125 mm 75 mm
79 cm 75 mm 75 mm 125 mm 75 mm
80 cm 75 mm 75 mm 150 mm 75 mm
81 cm 75 mm 75 mm 150 mm 75 mm
82 cm 125 mm 75 mm 75 mm 150 mm 125 mm 75 mm
83 cm 125 mm 125 mm 75 mm 150 mm 125 mm 75 mm
84 cm 125 mm 125 mm 75 mm 150 mm 125 mm 75 mm
85 cm 125 mm 125 mm 75 mm 150 mm 150 mm 75 mm
86 cm 125 mm 125 mm 75 mm 150 mm 150 mm 75 mm
87 cm 150 mm 150 mm 125 mm 150 mm 150 mm 125 mm
88 cm 150 mm 150 mm 125 mm 150 mm 150 mm 125 mm
89 cm 150 mm 150 mm 125 mm 150 mm 150 mm 125 mm
90 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
91 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
92 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
93 cm 150 mm 150 mm 150 mm 150 mm 150 mm
94 cm 150 mm 150 mm 150 mm 150 mm 150 mm
95 cm 150 mm 150 mm 150 mm 150 mm 150 mm
96 cm 150 mm 150 mm 150 mm 150 mm
97 cm 150 mm 150 mm 150 mm 150 mm
98 cm 150 mm 150 mm
99 cm 150 mm 150 mm
100 cm 150 mm 150 mm
101 cm 150 mm 150 mm
102 cm 150 mm 150 mm
≥ 103 cm

Measure your inner leg length while wearing shoes, then check your frame size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

Mountain 7
High Step
Inner leg length S (40 cm)M (45 cm)L (50 cm)
≤ 69 cm
70 cm 75 mm
71 cm 75 mm
72 cm 75 mm
73 cm 75 mm
74 cm 75 mm
75 cm 75 mm 75 mm
76 cm 125 mm 75 mm
77 cm 125 mm 75 mm
78 cm 125 mm 75 mm
79 cm 125 mm 75 mm
80 cm 125 mm 125 mm 75 mm
81 cm 150 mm 125 mm 75 mm
82 cm 150 mm 150 mm 75 mm
83 cm 150 mm 150 mm 75 mm
84 cm 150 mm 150 mm 75 mm
85 cm 150 mm 150 mm 125 mm
86 cm 150 mm 150 mm 125 mm
87 cm 150 mm 150 mm 150 mm
88 cm 150 mm 150 mm 150 mm
89 cm 150 mm 150 mm 150 mm
90 cm 150 mm 150 mm 150 mm
91 cm 150 mm 150 mm
92 cm 150 mm 150 mm
93 cm 150 mm 150 mm
94 cm 150 mm 150 mm
95 cm 150 mm
96 cm 150 mm
97 cm 150 mm
98 cm 150 mm
99 cm 150 mm
≥ 100 cm

Measure your inner leg length while wearing shoes, then check your frame type and size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

Trekking 7
High Step Low Step
Inner leg length M (50 cm)L (55 cm)XL (60 cm)S (45 cm)M (50 cm)L (55 cm)
≤ 76 cm
77 cm 75 mm
78 cm 75 mm
79 cm 75 mm
80 cm 75 mm 75 mm 75 mm
81 cm 75 mm 75 mm 75 mm
82 cm 75 mm 125 mm 75 mm
83 cm 75 mm 75 mm 125 mm 75 mm 75 mm
84 cm 75 mm 75 mm 150 mm 75 mm 75 mm
85 cm 125 mm 75 mm 150 mm 125 mm 75 mm
86 cm 125 mm 75 mm 150 mm 125 mm 75 mm
87 cm 150 mm 75 mm 75 mm 150 mm 150 mm 75 mm
88 cm 150 mm 125 mm 75 mm 150 mm 150 mm 125 mm
89 cm 150 mm 125 mm 75 mm 150 mm 150 mm 125 mm
90 cm 150 mm 150 mm 75 mm 150 mm 150 mm 150 mm
91 cm 150 mm 150 mm 125 mm 150 mm 150 mm 150 mm
92 cm 150 mm 150 mm 125 mm 150 mm 150 mm 150 mm
93 cm 150 mm 150 mm 125 mm 150 mm 150 mm 150 mm
94 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
95 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
96 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
97 cm 150 mm 150 mm 150 mm 150 mm 150 mm
98 cm 150 mm 150 mm 150 mm 150 mm 150 mm
99 cm 150 mm 150 mm 150 mm 150 mm 150 mm
100 cm 150 mm 150 mm 150 mm
101 cm 150 mm 150 mm 150 mm
102 cm 150 mm 150 mm 150 mm
103 cm 150 mm
104 cm 150 mm
105 cm 150 mm
106 cm 150 mm
≥ 107 cm

Measure your inner leg length while wearing shoes, then check your frame type and size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

Trekking 8
High Step Low Step
Inner leg length M (45 cm)L (47 cm)XL (52 cm)M (42 cm)L (47 cm)XL (52 cm)
≤ 72 cm
73 cm 75 mm
74 cm 75 mm
75 cm 75 mm
76 cm 75 mm 75 mm
77 cm 75 mm 75 mm
78 cm 75 mm 75 mm 125 mm 75 mm
79 cm 75 mm 75 mm 125 mm 75 mm
80 cm 75 mm 75 mm 150 mm 75 mm
81 cm 75 mm 75 mm 150 mm 75 mm
82 cm 125 mm 75 mm 75 mm 150 mm 125 mm 75 mm
83 cm 125 mm 125 mm 75 mm 150 mm 125 mm 75 mm
84 cm 125 mm 125 mm 75 mm 150 mm 125 mm 75 mm
85 cm 125 mm 125 mm 75 mm 150 mm 150 mm 75 mm
86 cm 125 mm 125 mm 75 mm 150 mm 150 mm 75 mm
87 cm 150 mm 150 mm 125 mm 150 mm 150 mm 125 mm
88 cm 150 mm 150 mm 125 mm 150 mm 150 mm 125 mm
89 cm 150 mm 150 mm 125 mm 150 mm 150 mm 125 mm
90 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
91 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
92 cm 150 mm 150 mm 150 mm 150 mm 150 mm 150 mm
93 cm 150 mm 150 mm 150 mm 150 mm 150 mm
94 cm 150 mm 150 mm 150 mm 150 mm 150 mm
95 cm 150 mm 150 mm 150 mm 150 mm 150 mm
96 cm 150 mm 150 mm 150 mm 150 mm
97 cm 150 mm 150 mm 150 mm 150 mm
98 cm 150 mm 150 mm
99 cm 150 mm 150 mm
100 cm 150 mm 150 mm
101 cm 150 mm 150 mm
102 cm 150 mm 150 mm
≥ 103 cm

Measure your inner leg length while wearing shoes, then check your frame size in the MY26 table below. Recommendations may vary individually and apply only to a balanced riding position.

Urban 8
High Step
Inner leg length L (47 cm)XL (52 cm)
≤ 77 cm
78 cm 75 mm
79 cm 75 mm
80 cm 75 mm
81 cm 75 mm
82 cm 75 mm 75 mm
83 cm 125 mm 75 mm
84 cm 125 mm 75 mm
85 cm 125 mm 75 mm
86 cm 125 mm 75 mm
87 cm 150 mm 125 mm
88 cm 150 mm 125 mm
89 cm 150 mm 125 mm
90 cm 150 mm 150 mm
91 cm 150 mm 150 mm
92 cm 150 mm 150 mm
93 cm 150 mm 150 mm
94 cm 150 mm 150 mm
95 cm 150 mm 150 mm
96 cm 150 mm 150 mm
97 cm 150 mm 150 mm
98 cm 150 mm
99 cm 150 mm
100 cm 150 mm
101 cm 150 mm
102 cm 150 mm
≥ 103 cm

Important: The installation instructions apply only to MY26 models. On older models (MY24/25), the e-dropper may already be factory-installed; in this case, the user manual is provided solely for reference regarding specifications and configuration.

Download →

Customer Reviews

Overall rating: 4.6 / 5 from 10 reviews.

Customer photo review of ISTOS E-Dropper Post

Bin bisher sehr zufrieden mit meinem E-Bike ich hoffe ich habe noch sehr lange Freude daran. Reichweite ist super nur im Tour Modus 160 km. Für das Geld ein geiles Gerät. Danke weiter so.

Andreas M. 5/5 Verified

ISTOS E-Dropper Post

Customer photo review of ISTOS E-Dropper Post

Sehr gute Fahreigenschaften, Ich muss mich erst daran gewöhnen bei einen Halt den Sattel nach unten zu fahren

Gert S. 4/5 Verified

ISTOS E-Dropper Post

Cooles Zubehör und bietet eine einfache Höhenverstellung bei unterschiedlichen Fahrern/Fahrerinnen.

Christoph R. 5/5 Verified

ISTOS E-Dropper Post

E dropper ist super. Leider wird er aktuell noch über die rechte Taste bedient, so dass ab und zu leider der Bordcomputer mit ausgestellt wird. Soll doch ein Update geändert werden können. Mal schauen.

Michael G. 4/5 Verified

ISTOS E-Dropper Post

Ich bin mit dem E-Bike voll und ganz zufrieden.

Ralf R. 5/5 Verified

ISTOS E-Dropper Post

Livraison rapide et emballage protecteur. Le vélo est arrivé pratiquement prêt à l’emploi (juste les pédales à visser et le guidon à fixer. Les performances sont clairement au dessus de mes attentes, pour faire du chemin roulant et de la randonnée à la journée. Le mode eco permet un pédalage facile sur le plat, le mode tour aide franchement dans les montées et le mode turbo permet le franchissement de côtes très raides. L’écran LCD donne toutes les infos et permet les changements immédiats de mode. Le vélo est très complet, il manquerait juste une petite trousse de secours (pour les crevaisons possibles) pour y ranger les quelques clefs Alen et une pompe. Le système d’ajustement de la tige de selle me semblait être un gadget mais il se révèle très utile à l’utilisation pour trouver sa hauteur de pédalage en fonction du type de dénivelé. Je recommande HEPHA pour son rapport qualité/prix (la qualité est clairement visible dès la prise en main).

Gilles M. 4/5 Verified

ISTOS E-Dropper Post

Nach kurzer Verwirrung und Kommunikation mit dem Support, welche mir erklärten, dass der E-Dropper in der App noch nicht eingebunden ist, funktioniert jetzt alles.

Herr M. 4/5 Verified

ISTOS E-Dropper Post

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