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ESJOT Sprocket 20-0268-38 for Hercules & Zündapp 50cc Mopeds

SKU: 20026838
GTIN: 4251516547343
HAN: H66-650538
Manufacturers: Esjot

Compatible with 415 pitch chains: Fits standard moped chains with 415 pitch
38 teeth for extended gearing: Lowers engine RPM at constant speed
Fits many Hercules & Zündapp models: Suitable for various 50 cc mopeds with 268-type bolt pattern
Inner diameter 42.5 mm: Matches common hub openings
66 mm bolt circle with 4 holes: Standard 7.5 mm hole spacing for mounting
Ideal for gear ratio tuning: Replaces OEM sprockets with higher tooth counts

14,95 €

incl. 19% VAT , plus

Currently out of stock

Rear‑Wheel Sprocket for 50 cc Mofa / Moped – Technical Description & Compatibility

Product Overview and Technical Base Data

The rear‑wheel sprocket ESJOT 20‑0268‑38 with 38 teeth and 415 pitch is specially designed for 50 cc mopeds and mofas.

Key Technical Specifications

Pitch: 415
Number of teeth: 38
Inner diameter: approx. 42.5 mm
Bolt circle (PCD): 66 mm
Bolt hole diameter: approx. 7.5 mm
Mounting: 4‑bolt mounting (fits standard rims/hubs of the specified mopeds)

Compatible Vehicle Models and Years

Below is an overview of all known mopeds and models for which the ESJOT 20‑0268‑38 is theoretically compatible — provided the original hub/rim matches the listed dimensions (inner diameter and bolt circle). Manufacturer, model, and years are listed as provided by the user:

Manufacturer	Model	Year(s)
Hercules	H 905	(various)
Hercules	MP2	(see below)
Hercules	MP4	(see below)
Hercules	MF3	(various)
Hercules	M4	(various)
Hercules	M6	(various)
Hercules	HR2	(various)
Hercules	M5	(various)
Hercules	Hr2	(various)
Hercules	HR 50 Hobbyrider HR1	1973‑1975
Hercules	HR 50 Hobbyrider HR2	1974‑1982
Hercules	HR 50 Hobbyrider HR2 (Aluminum wheel)	1974‑1982
Hercules	HR1 50 Hobby Rider	1972‑1975 (1.1 kW / 1.5 PS HR1/631)
Hercules	HR2 50 Hobby Rider	1974‑1987 (1.1 kW / 1.5 PS HR2‑633)
Hercules	M 50 Mofa M1/M2	1974‑1978
Hercules	M 50 Mofa M4	1974‑1978
Hercules	M 50 Mofa M5	1974‑1978
Hercules	M4 50 M4	1974‑1978 (1.0 kW / 1.4 PS M4‑511)
Hercules	M5 50 M5	1974‑1978 (1.0 kW / 1.4 PS M5‑634)
Hercules	MF1 50 MF1	1970‑1972 (MF1‑504)
Hercules	MF2 50 MF2	1970‑1972 (MF2)
Hercules	MP 50 MP2	1970‑1975
Hercules	MP 50 MP4	1972‑1982
Hercules	MP2 50 MP2	1972‑1977 (2.1 kW / 2.9 PS MP2‑630)
Hercules	MP4 50 MP4	1972‑1977 (MP4/632)
Hercules	Optima 50 Optima	1994 (2.2 kW / 3.0 PS)
Hercules	Optima 50 Optima 3 / 3S	1986‑1999
Hercules	Optima 50 Optima 4	1986‑1999
Hercules	Optima 3 50 Optima 3	1978‑1987 (2.0 kW / 2.7 PS 515)
Hercules	Optima 3S 50 Optima 3S	1982‑1989 (1.8 kW / 2.4 PS)
Hercules	Optima P3 50 Optima P3	1978‑1987
Hercules	Optima S3 50 Optima S3	1978‑1987
Hercules	P1 50 P1	1973‑1977 (P1‑505P)
Hercules	P3 50 P3	1974‑1977 (P3‑513)
Hercules	Prima 50 Mofa Prima 1/2	1979‑1986
Hercules	Prima 50 Mofa Prima 3	1979‑1991
Hercules	Prima 50 Mofa Prima 4/5	1979‑1987
Hercules	Prima 50 Mofa Prima 4S/5S/6	1979‑1985
Hercules	Prima 50 Mofa Prima 4SL/5SL	1985‑1987
Hercules	Prima 50 Mofa Prima S	1979‑1981
Hercules	Prima 50 Mofa Prima SX	1985‑1988
Hercules	Prima 1 50 Prima 1	1978‑1987 (1.1 kW / 1.5 PS G3)
Hercules	Prima 2 50 Prima 2	1986‑1998 (1.1 kW / 1.5 PS 504)
Hercules	Prima 2N 50 Prima 2N	1978‑1987 (1.1 kW / 1.5 PS 504 012)
Hercules	Prima 2S 50 Prima 2S	1982‑1994 (1.1 kW / 1.5 PS 504 013)
Hercules	Prima 3 50 Prima 3	1994 (1.1 kW / 1.5 PS 504)
Hercules	Prima 3S 50 Prima 3S	1978‑1995 (1.1 kW / 1.5 PS 504 014)
Hercules	Prima 4 50 Prima 4	1978‑1979 (1.1 kW / 1.5 PS 511)
Hercules	Prima 4N 50 Prima 4N	1978‑1987 (1.1 kW / 1.5 PS 511)
Hercules	Prima 4S 50 Prima 4S	1979‑1987 (1.1 kW / 1.5 PS 511)
Hercules	Prima 4SL 50 Prima 4SL	1981 (1.1 kW / 1.5 PS 514 001)
Hercules	Prima 5 50 Prima 5	1978‑1995 (1.1 kW / 1.5 PS 634)
Hercules	Prima 5N 50 Prima 5N	1978‑1987 (1.1 kW / 1.5 PS 634)
Hercules	Prima 5S 50 Prima 5S	1979‑1995 (1.1 kW / 1.5 PS 634)
Hercules	Prima 5SL 50 Prima 5SL	1981 (514 041)
Hercules	Prima 6 50 Prima 6	1978‑1980 (M6‑635)
Hercules	Prima SX 50 Prima SX	1983‑1984 (1.1 kW / 1.5 PS)
Zündapp	ZA 25 (example model)	(various)

Notes on Compatibility when in Use

The Hercules and Zündapp models often come standard with sprockets of 40, 45, 48, 50 or more teeth. With the 20‑0268‑38 you can achieve a longer gearing — provided hub and rim match the specified dimensions. Such a gearing change can significantly affect riding behavior, especially speed and torque.

Why ESJOT 20‑0268‑38 makes sense as Replacement or Gear‑Ratio Change

Many classic 50 cc mopeds are only running on worn or used rear sprockets today. The ESJOT 20‑0268‑38 offers a robust, precisely manufactured replacement made of high‑quality steel that enables reliable installation and long service life — as long as the hub dimensions match.

Benefits when used as Replacement

Precise fit: Thanks to standardized dimensions (415 pitch, 66 mm bolt circle, 4‑bolt mounting), the sprocket is ideal as a direct replacement for worn original sprockets.
Flexibility in gearing: With 38 teeth the gearing can be changed — e.g. for longer rides or a different riding behavior.
Wide model compatibility: Numerous Hercules and Zündapp models (see table) are compatible, provided the hub is standard.

Scope of Delivery & Important Notes

1 × ESJOT rear‑wheel sprocket 20‑0268‑38 (38 teeth, 415 pitch)
Mounting bolts are not included (original parts or appropriate bolts need to be sourced separately)
Tools for installation are not included.

How to Check Compatibility Before Purchase

To ensure that the ESJOT sprocket fits your moped, please follow these steps:

Check the currently installed chain: the pitch must be 415 (usually stamped on the chain pack or on the links).
Measure the hub opening: inner diameter should be approx. 42.5 mm.
Measure the bolt circle: the center‑to‑center distance of the mounting holes must be 66 mm, mounting uses 4 holes with about 7.5 mm diameter.
If all dimensions match, installation is possible — otherwise the sprocket will not fit.

Important Notes

This sprocket is explicitly intended only for 50 cc mopeds with matching hub dimensions.
If dimensions deviate, compatibility cannot be ensured.
A change in gearing will affect riding characteristics, acceleration and top speed — please verify carefully.

With the ESJOT 20‑0268‑38 you get a high‑quality replacement part that impresses with precise manufacturing and flexibility. Before buying and installing, we recommend to carefully check the dimensions of your existing hub and chain to ensure the sprocket can be mounted cleanly and safely.

Product safety information

Manufacturer information:

ESJOT Antriebstechnik GmbH
Oesterweg 24
Ense-Höngen, Deutschland, 59469
info@esjot.com

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