Originally Posted by
KCT1986
The spacers for 7s are 3.1mm thick. Comes in 3 different configurations.
Spacer for large splined part of freewheel body.
Spacer for smaller splined part of freewheel body. Available in larger OD or smaller OD, depending on tooth count of sprockets used.
Number of spacers needed depends on the sprocket used. Some sprockets have built-in spacers already. Sprockets are of 4 different types, large or small splined, threaded and outer threaded.
Search the Shimano Tech docs (MF-7400) for details and the EV doc/parts list for sprockets available for each position, and which sprockets are the built-in spacers type.
Here is an old diagram of the configuration.
Forgot to mention, if the
very middle sprocket is not the built-in spacer type, the spacer behind it (hub side) should be the larger OD type. The smaller OD type in this position may not properly secure/support the larger splined sprockets behind it.