Bicycle Mechanics - Shimano Freewheel Question

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echo
10-17-11, 09:06 PM
I just received this freewheel and was looking at the teeth and noticed the inconsistencies in the tooth profiles, seems like they are cut differently all over the place...this is about the best pic I can get. If you look closely you can see the differences in tooth width, and the top cut angles on the teeth, is this somewhat normal? or is this a defective freewheel? I must admit I haven't paid much attention to tooth profile on the past freewheels I've had.

http://i56.tinypic.com/2k51m8.jpg

dsbrantjr
10-17-11, 09:20 PM
Echo2011: The teeth are cut and shaped that way to aid in shifting. That is completely normal and is characteristic of Shimano's Hyperglide system.
Jeff Wills
10-17-11, 10:39 PM
Echo2011: The teeth are cut and shaped that way to aid in shifting. That is completely normal and is characteristic of Shimano's Hyperglide system.

+1. Shimano Hyperglide appeared in 1990. Freewheel and cassette teeth have looked like that since then.

Matt Gaunt
10-18-11, 05:07 AM
+1. Shimano Hyperglide appeared in 1990. Freewheel and cassette teeth have looked like that since then.

+2. If you're interested, there is a Shimano video, on how they designed it and why the teeth are shaped individually, on YouTube. Search "Shimano Hyperglide" and it's the first hit. (Sorry, work block YT).
echo
10-18-11, 01:48 PM
Thanks guys, much appreciated!