Originally Posted by
Litespud
Doesn't matter how thick the wax is - a steel chain is going to have it's way.
This is true for a single/fixed gear bike. On a multi-speed bike there's a substantial chain slack that is compensated by a rear derailleur, and the stiff chain is now fighting with the derailleur spring.
If the chain is stiff enough it will not allow the derailleur take up the chain slack effectively and we end up with the chain skipping.
This is my understanding of the bike drive train mechanics. Please correct or feel free to laugh at me if I'm wrong