5 speed freewheel

BigSpecs
BigSpecs Posts: 309
edited December 2007 in Workshop
I have an old mountain bike I am renovating. It currently has a screw on 5 speed freewheel. Two questions:
1. If I remove the 5 speed will a larger range freewheel (eg 7 speed) fit in the same space on the axle/ between the rear drop outs ok?
2. Will the current rear derailler work with a freewheel with more sprockets?

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