new chain problems...
07-17-10, 02:40 PM
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new chain problems...
im rebuilding a small road bike, installed a new chain and now the freewheel skips in the smallest 2 gears. i adjusted the rear derailleur as much as i can it lines up perfect and shifts up and down, but acts like its not sized up for the 2 smallest cogs. bike ran perfect on the old rusty chain. what do i need to replace?
07-17-10, 03:11 PM
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This is par for the course. If the old chain was run until well worn (measure it for stretch if you still have it), the sprockets will be similarly worn and a new chain will skip (disengage and climb over the tops of the sprockets under load).
Usually this happens on the most used or smallest sprockets, but you you'll need a complete new cassette (or freewheel). You can also eyeball it if you have a new cassette to compare to, or by comparing the tooth profile of the smaller worn sprockets to the largest which is usually least worn. If the "U"s between the teeth are visibly broadened at the base, or the teeth appear somewhat asymmetrical the cassette is toast.
Usually this happens on the most used or smallest sprockets, but you you'll need a complete new cassette (or freewheel). You can also eyeball it if you have a new cassette to compare to, or by comparing the tooth profile of the smaller worn sprockets to the largest which is usually least worn. If the "U"s between the teeth are visibly broadened at the base, or the teeth appear somewhat asymmetrical the cassette is toast.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
07-20-10, 04:48 PM
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