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I was experiencing something like this, and pinned it down to a bit of slack in the chain...
I could live with it, until bombing down a hill yesterday at full tilt, and the chain decided to drop off the chainring. luckily didn't get stuck in the spokes and shred my lovely new wheel, it just locked my back wheel up, resulting in the mother of all skids, lasting about 30 or 40 metres fishtailing all over the shop I was bricking it. (busy main road in rush hour with cars passing at 40-50mph) Finally slid to a halt and checked my tire, surprised it looked ok.. then saw how it had gone through to the casing and was completley flat for about 4 inches. It was a bumpy ride home!
So anyway way question 1 :
I'm guessing the chain dropping off was due to it being slack, but does anyone have a good method for getting really good chain tension? I'm running an old bob jackson frame, with front loading horizontal drop outs. I just can seem to get the chain super tight?
Question 2: Anyone know any good strong and cheapish tires? I've been running 23c s but could fit something a bit bigger, not too big and slow though, but something that won't die if i do a40 metre 30 mph skid? (which is pretty unlikely i have to admit, but would be nice to know the option was there.)
All help would be greatly appreciated, cheers!
Does anyone know a nice hard compound tyre that will stand up to some skid abuse?