Change wheels and need to adjust rear derailleur
I have recently purchased a new best bike with a set of mavic cosmic's which are great except when it is a bit windy so in the recent weeks I changed the wheelset to my mavic ksyrium sl's but doing so meant I had to adjust the rear derailleur as the gears on the rear cassette would not seat properly and slip. Lots of chain chatter, obvious they are not seated properly.
I have never experienced this when changing rear wheels before and either the lbs used an incorrect spacer, the cosmics have a slightly different freewheel start point along the axle or this is completely normal.
Has anybody experienced this before?