-
When the chain slips as you pull away from a red light/junction, your balls will slam onto the top tube and your knee will smash on the stem. Then you go to pedal away and realise the chain has dropped off the front rings. So you move onto the pavement to put the chain back on and your hands get all oily/greasy. Repeat this 2 or 3 times.
Then you will wish you bought a new chain ring. -
Aren't those short teeth there by design for shifting?
-
managed to ease back to something like true so no issue there
For all the chat about whether your teeth should be that shape, it's actually the bending it back into shape which is the real issue. Chainrings, like most aluminium alloy bicycle parts, are made from precipitation hardened alloys. The price you pay for high yield strength is very poor ductility. When you try to apply large cold deformations, you usually are not flowing the alloy as you might in a highly ductile metal, you're just moving the cracks around. Material which has suffered this kind of abuse is seriously weakened, and is likely to fail catastrophically under peak loading conditions, which is exactly the moment when it can do the most damage to the rider.
As a general rule, any component made from one of these alloys (which is basically all the ones used for bicycle parts) which has been bent far enough to stop functioning as designed should be binned immediately, because bending it back into shape just makes the crash you have when it breaks worse than the one you had to bend it.
You are reading a single comment by @Pasty_Spumante and its replies.
Click here to read the full conversation.
farewell
Emyr
gbj_tester
@Pasty_Spumante
Bent chainring last night, managed to ease back to something like true so no issue there, however 3 teeth broken too. Just ride it or will I soon realise I need a new ring?
1 Attachment