7 speed cassette
Plus any 700c wheel that takes a shimano cassette, the cassette should come with a spacer that will make it wide enough.
if not get one here
A wheel that takes a cassette will likely be 126mm spacing and if you have an old steel frame that will likely be 120mm spacing between the dropouts. Do not worry about this as you can spread the dropouts the extra 6mm and it will be fine.
@Bernhard started
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7 speed cassette
Plus any 700c wheel that takes a shimano cassette, the cassette should come with a spacer that will make it wide enough.
if not get one here
A wheel that takes a cassette will likely be 126mm spacing and if you have an old steel frame that will likely be 120mm spacing between the dropouts. Do not worry about this as you can spread the dropouts the extra 6mm and it will be fine.