Bicycle Mechanics - Deralleur help
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10-06-09, 04:34 PM
I'm trying down-hilling/free-ride, but my bikes stock derailleur is terrible. it is soft and allows the chain to bounce and slap to easily. does anyone know of a way to stiffen a derailleur? if not, what is a good derailleur to buy. please, no jokes and "rude replies. ive already had enough of this in the past day.
10-06-09, 04:37 PM
It all depends on what you are running, cranks? Gearing? Chain slap is generally pretty normal (to some extent) and generally a derailleur isn't going to fix that unless I'm misreading your post. Is your chain too long? Is your rear derailleur picking up enough slack?
10-06-09, 10:52 PM
Have you tried adjusting the tension screw on the rear Derailure ? Just a thought.
10-06-09, 11:02 PM
I'd agree with johnknappcc above. Check your chain for length, and your derailleur cable for proper tension. It should - the cable - be taut while in the resting position - small cog in rear, small chainring up front.
If you could post a photo of your rear-derailleur with the chain in both the small-small setting above, and another of it in the large-large position, this could help us come up with a more certain diagnosis.
10-07-09, 01:36 PM
If you've checked your chain length, cable tension, and adjusted your b-tension screw, it may just be that your derailleur springs are worn out or crappy to begin with. Just dealt with this on my old 400lx shimano rd.
10-07-09, 05:00 PM
didn't they used to make something like an 'idler pulley' on a tanbem for downhill bikes? it went on the chainstay and kept extra tension on the chain
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