When I’m at a red light, if I see that I’ve got plenty of time to start pedaling and get moving before the bus about two hundred yards comes to its green light, I start pedaling hard, which sometimes causes my chain to slip.
It makes a horrible noise, and provides me with fear that the oncoming bus will not be able to stop and that I will not be able to cross in time and will fly high before lying facedown in the gutter after he hits me. The noise is embarrassing because people waiting for the bus can hear it and they look up and think what’s wrong with that guy’s bike supplies.
Well, my chain’s old. And, I recently got a new cassette and since I ride a freewheel, they wear out differently. I have to take it to my local bike shop to find out if the chain is worn. If it isn’t, it could be a number of other problems, such as a bent tooth on my gears, or the front chainrings or possibly even the cassette ratchet body. If it’s a problem like that, it’s best to take it to a pro bike mechanic who really knows his bike supplies and bicycle accessories.