Gary,

In my experience if you're changing you chain often enough as wear indicates there's no problem swapping back and forth. I'm doing this with a Tacx Neo with no problems what so ever. The chain is the least expensive item in the drive train so don't be stingy in changing it up. In my experience, if you're wearing out cassettes regularly it'd due to running a worn out chain on them.

YMMV,

Hugh

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Genetics load the gun, lifestyle pulls the trigger.

Get one of those chain wear measuring devices. I used one to measure my old chains that I'd kept for no good reason and to my surprise, they didn't show any sign of measurable stretch. So just because one perceives a chain to be old and worn, doesn't make it so.

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Books @ Amazon
"If only he had used his genius for niceness, instead of Evil." M. Smart

I've had one for years and use it regularly:)

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Genetics load the gun, lifestyle pulls the trigger.

Thanks for the responses so far. Just for clarity I’m anything but stingy when it comes to my fleet of bikes, P5, S5 etc and I have them serviced ahead of each season as I have done for the past 30 years or so. I always have a new chain fitted and cassette- perhaps it’s just habit or fear of mechanicals during an event.

But last weekend I was out on my MTB which is a year or so old and the chain broke. Unfortunately although I kept it my other half threw it away whilst I was away on business. On return I took the MTB to LBS and they fitted a new chain whilst I was there. With the old cassette left in place you could actually hear it was not running smoothly! I have only done about 600 miles on it, far less than I would do on my Tri bikes. This seemed to reinforce the idea that chain and cassette wear into each other - if that makes sense.

So I could do 600 mikes on my S5 next year pop it on the Kickr which might have a cassette only several hours old- just wondering if that would cause problems. Sounds like not but thanks.