The middle chain ring has some teeth that almost look torn and bent out of shape. The edges don't look rusty or uneven, and I don't even know how the previous owner would have done this via normal use.
by EmperorsChamberMaid_
The middle chain ring has some teeth that almost look torn and bent out of shape. The edges don't look rusty or uneven, and I don't even know how the previous owner would have done this via normal use.
by EmperorsChamberMaid_
4 Comments
Yes that’s normal. They help shift up or down from the middle
Its normal in the sense that its intentional, but its not common.
The idea is basically that the teeth can grab the chain and pull it up easier when shifting.
Not that many chainrings used it, I would assume that any benefits weren’t worth the additional cost of manufacture
They help shift the chain from the small ring to the middle.
It appears that your chain is backwards, though. Typically, the links have stamped writing on one side only, which should face away from the bike. (I’ve never used a YBN chain so I don’t know whether that is true for them.)
Very basic primitive versions of what Shimano perfected and called hyperdrive ramps. They aid shifting by, as the name suggests, providing ramps to help the chain climb between gears.