Turn the tiny spring tension bolts closest to the brake bosses. You might want to clean and lubricate the bosses and replace cables and housing so everything moves freely.
Setup the brakes completely and then setup the pads..the “shark tooth” was to keep the chain from jamming over the brakes.
One thing to keep in mind is that when the brake pads wear..they wear towards the tire..so set them just a bit “low” or a bit closer to the spokes, just off dead center.
We all had U brakes under the BB in the mid 1980’s…and one of my off road riding buddies, who was a LBS mechanic for 10 years at the time, set his brakes up and they wore closer and closer to the tire…ok that’s what they do.
But,
One day I just looked at his rear tire, for some reason before we were about to start off…I noticed right away, showed him and told him immediately about what was going on with the tire…
The brake pads were braking slightly on his tires, just at the tire bead…the sidewalls of his tires were cut right through by the brake pads…you could even see the tube all the way around the tire, peeking through here and there…in about 5-6 places on both sides of his wheel.
It was one of the most ridiculous observations I ever had…all the way along, right around, just above the rim.
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Turn the tiny spring tension bolts closest to the brake bosses. You might want to clean and lubricate the bosses and replace cables and housing so everything moves freely.
Also might want to consult Guru Sheldon: https://www.sheldonbrown.com/canti-u.html
Setup the brakes completely and then setup the pads..the “shark tooth” was to keep the chain from jamming over the brakes.
One thing to keep in mind is that when the brake pads wear..they wear towards the tire..so set them just a bit “low” or a bit closer to the spokes, just off dead center.
We all had U brakes under the BB in the mid 1980’s…and one of my off road riding buddies, who was a LBS mechanic for 10 years at the time, set his brakes up and they wore closer and closer to the tire…ok that’s what they do.
But,
One day I just looked at his rear tire, for some reason before we were about to start off…I noticed right away, showed him and told him immediately about what was going on with the tire…
The brake pads were braking slightly on his tires, just at the tire bead…the sidewalls of his tires were cut right through by the brake pads…you could even see the tube all the way around the tire, peeking through here and there…in about 5-6 places on both sides of his wheel.
It was one of the most ridiculous observations I ever had…all the way along, right around, just above the rim.
For the record, the “Shark tooth” is independent of the brake. “During the late ’80s when there was a fad for mounting [U-brakes](https://www.sheldonbrown.com/gloss_u-v.html#ubrake) under the [chainstays](https://www.sheldonbrown.com/gloss_ch.html#chainstay). Shimano’s Shark Tooth was a small plastic part that mounted to the right hand U-brake boss as an anti-[chain-suck](https://www.sheldonbrown.com/gloss_ch.html#chainsuck) device.” You can buy them on ebay now and again and install them.