The year 1973 was a 'transitional year' for the Sachs Duomatic.
Whether this spring fits depend entirely on which specific hub model you have from that production run.
How to identify your hub:
In 1973, production switched from the older Model 102 to the newer Model R 2110.
Since the spring in your photo (part no. 0113 100 100) is designed exclusively for the R 2110, you must check your hub for the following features:
If the hub shell has no oil port (the small flip-top oiler) and the axle ends are completely round.
- It DOES NOT FIT (Model 102):
If your hub still has an oil port and the axle is flatted (two flat surfaces for a wrench) at the ends. In this case, you require the spring ending in -000.
The 'Sachs Year Code' Test:
Sachs stamped a letter on the hub shell (near the 'Sachs Torpedo' logo) to indicate the year of manufacture. Look for a single capital letter:
- P stands for 1972 (mostly Model 102).
- R stands for 1973 (both models were produced this year).
- S stands for 1974 (mostly the newer R 2110).
Conclusion:
If you have a round axle without an oiler, this 1973-era spring is a perfect match.
If you have a flatted axle with an oiler, this part is unfortunately incorrect for your hub.
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