Originally Posted by
fluidmosaic
Just checked the gear and all the teeth look fine except two of them that are opposite each other have no tops. Don't know if that is normal or not.
On outer and middle rings, there are often teeth that look flattened. This is normal and aids in shifting. On the inner ring, the teeth are usually the same size all the way around.
Originally Posted by
operator
New chain? Old Cogs? Skipping under load? = Worn out cogs.
Let's do a sanity check for a stiff link as well.
Cogs (aka cassette gears) can skip with a new chain and old cogs. Chainwheels (aka crank gears) usually don't skip with a new chain.