Judging from what I've read in the thread suggested above by fruitbat the quest for good all round chain tension can be an arduous one.
It's really not that hard, what he says about hitting the chain with something (I use a monkey wrench) works. At least I'm not a mechanic and the first time I tried it I could see the difference, the problem I have is tightening the bolts that hold the gear to the spider... they are always coming loose (I've actually lost about 4 bolts already!)... I've just learnt to live with the fact that if I change the direction of pressure I loose an inch to the gear shifting on the spider!
I took slack chain to the limits yesterday coming down BRixton Hill when it actually popped off and got caught in my hub.
same thing happened to me a couple of weeks ago, only coming down the hill just after clapham north, had a flat, street repair, obviously didn't tighten chain enough, chain wrapped around wheel and I skidded for what seemed like about 20 yards... ruined the tyre but was impressed that I managed to not fall off...
It's really not that hard, what he says about hitting the chain with something (I use a monkey wrench) works. At least I'm not a mechanic and the first time I tried it I could see the difference, the problem I have is tightening the bolts that hold the gear to the spider... they are always coming loose (I've actually lost about 4 bolts already!)... I've just learnt to live with the fact that if I change the direction of pressure I loose an inch to the gear shifting on the spider!
same thing happened to me a couple of weeks ago, only coming down the hill just after clapham north, had a flat, street repair, obviously didn't tighten chain enough, chain wrapped around wheel and I skidded for what seemed like about 20 yards... ruined the tyre but was impressed that I managed to not fall off...