Chainstay spacing - please educate me!

funkster

Dirt Disciple
So I'm trying to get to grips with the intricacies of the vintage road bike...
If a frame has 120mm chain stay spacing, then it can fit an older rear cassette, but not a newer one!? :facepalm:
Which will fit, which will not!? Help!
 
Stick to a standard 5 speed freewheel (called a block), two chainrings up front and that's 10 gears............enough for anyone :)

Shaun
 
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