Originally Posted by
maddog34
those are "clean out grooves" designed to evacuate built up gritty chain grunge, etc.
the fact that they are now turning into yawning cracks, and that the teeth adjacent to them are in a different plane, is not good... i don't care if "they were designed that way".. not good.
the large ring appears to be lacking shift aids other than old style ramps, too...
modern pins and ramps, with lifting cutouts, will greatly improve shifting to that ring.
Those
are the lift pins. Maybe not as elegant as those found on more expensive chainrings but they serve the same purpose. If they were “yawning cracks”, why are there 3 identical ones in the picture? They are also positioned where you would find pins in the more expensive chainrings
Here’s two other chainrings with similar structures but of a higher quality. A bit more refined but they are there for the same purpose…to lift the chain and aid in shifting. Removing them by grinding them off would be a huge mistake.
