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Atom Freewheel Disassembly

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Atom Freewheel Disassembly

Old 08-09-13, 09:50 AM
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Originally Posted by Grand Bois View Post
Do yourself a favor and replace it with a new Shimano. Even the ones made in Singapore are better than that Atom. You won't believe how much better the twisted tooth design makes them shift.
I find the twisted tooth design to be a PITA, when used with friction levers. The problem is they shift too well - even when I don't want to shift. The beauty of old style (non-hyperglide, twisted) cogs is that they will stay on the selected cog for a wide variation of derailleur position. This keeps desired cog selection for the overshoot/trim shift as well as the inevitable gradual movement of the derailleur due to road vibration.

The trim function is incorporated into the top jockey wheel on derailleurs designed for index shifting. That may make it easier for shifting with a friction lever. It should eliminate the need for overshoot/trim shifting. However, my 40 year old derailleur still shifts almost like new. I see no reason to change, so long as I can still get freewheels without those twisted teeth.
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Old 08-09-13, 01:23 PM
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I haven't had that problem. Maybe because I use Simplex Retrofriction shifters and Suntour ratcheting Barcons and gradual shifter movement from road vibration is not inevitable.
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