I use a single set of wheels with a Campy Record chain and cassette. However, I recently got a set of aero wheels that I would like to use once in a while. The problem I find is that with the record cassette being the same age as the chain on the bike now, if I was to use the set of aero wheels with their own new chorus cassette I am guessing I would have difficulties shifting flawlessly due to the cassette and chain wearing at the same rate vs the new unused cassette. Eventually, when this record cassette has gone past its life, I will stick with chorus cassettes, which will last longer.

My questions are:

1. Should I just be putting my record cassette in the aero wheels when I use them or can I use the brand new chorus cassette on the aero wheels without problems? Which way do most people do this with mulriple wheel sets?

2. If I use a 11-23 cassette in my current set up and replace it with a 13-26 or even 13-29, would the same chain I have there now work properly? Would I have to replace the chain for a longer one?

The best way to handle this is to have two chains, each dedicated to one wheel/cassette set. If you use Wippermann chains with their Conex master links, removal and reinstallation is easy.

You should be able to use multiple wheels and cassettes on the same chain. The cassette and shifters must be compatible and the chain must be well within wear tolerance and properly sized. This is common practice.
Measure your chain often, you should be able to wear out at least 3 Record chains to one Record cassette.

Al