10 speed chain on 11 speed cassette Recently I installed an 11 speed cassette and shift levers on my road bike (105 R7000), but I kept the 10 speed chain that I have.

It sort of works fine but on the third cog on the back the chain hops and skids even if I fine tune with a barrel adjuster.



Is it because a 10 speed chain is not compatible with an 11 speed cassette?

Should I buy an 11 speed chain?
Each greater "speed generation" of chain is narrower than the last, which is measured in the length of the pins. If you run a wider chain than matches the cassette, it will tend to ride up on the shifting ramps and be otherwise impossible to adjust cleanly.