Up until today I have been experiencing a really annoying problem with my bike: when I am in the higher gears, from 5 to 10, and I go over a bump, frequently (mostly) the drive train slips. I wasn't sure exactly what was happening so I hung the bike up and examined the situation at the derailleur carefully.
I noticed that the smaller cogs are pushing the derailleur to its limit trying to keep the chain tight, whereas on the larger cogs, it seems to keep plenty of tension on the chain.
A closer examination of the mechanism revealed a little screw which, when tightened, puts more tension on the spring and holds the chain tighter on the gears. I tightened the screw about one and a half turns and that's it. I'm going to back it off, bit by bit, until I get slippage again
I noticed that the smaller cogs are pushing the derailleur to its limit trying to keep the chain tight, whereas on the larger cogs, it seems to keep plenty of tension on the chain.
A closer examination of the mechanism revealed a little screw which, when tightened, puts more tension on the spring and holds the chain tighter on the gears. I tightened the screw about one and a half turns and that's it. I'm going to back it off, bit by bit, until I get slippage again