My bike's better than me!
Join Date: Feb 2005
Location: Northern Colorado
Bikes: (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
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When you say "carry," do you mean carry them with you on rides? Is it your intent to change cassettes when you transition from the flats to the hills, and vice-versa?
If so (and I'm not sure that's what you mean), then don't you offset any savings in pedaling efficiency by the additional weight of carrying the tool and the cassette along with you on the ride?
If I've misinterpreted your post, then I apologize....