How to Adjust a Bicycle Derailleur It looks complicated, but if you know how a derailleur works, you can fix many bike problems on your own. As told to James Lynch Published: Mar 06, 2019 9:42 AM EST ...

Derailleur adjustments were controlled from a small box zip-tied to Wegmann's brake cables, ... As such, Shimano has reduced the section of the front rim to 24mm as well.