So, every Thursday I go on a bike ride with a friend. Last week, when it was Thursday-Bike-Riding-Time I could feel something was wrong with the chain. (Actually, I had realized the problem for some time before that, but it was then that it really caught my attention.) Silly me didn’t think much of it – I assumed it had to do with shifting the gears and that the problem would simply dissipate, if I just shifted several times, until the chain was properly adjusted on the gears again. (Can you tell I don’t know much about bikes?) Well, you’re right because my logic didn’t work. Though nothing happened on Thursday, the following day when riding my bike to the tennis court, the chain came off as I was going uphill and shifting the gears. I fixed it after I got home (yes, I know how to put the chain back on, though I really hate getting my fingers dirty) – or at least I thought I’d fixed it. Saturday, riding my bike again, all …