Originally Posted by
contango
I was just thinking if you wanted something like a 11-34 cassette on a knobby-tyred wheel and 11-23 on a slick-tyred wheel you'd have 11 spare links on the latter. I suppose if you've got an RD that can cope with a 34t sprocket it can cope with a 23.
OP, however, wants to use the same IGH rear wheel on multiple bikes. I'm thinking that different chainring sizes and different chain stay lengths might cause him more chain length issues than the same project on a derailleur bike.