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SunTour New Winner cog differences

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SunTour New Winner cog differences

Old 10-05-23, 12:04 PM
  #26  
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Originally Posted by steelbikeguy
Did we discuss bevels before?
I seem to recall commenting that it's odd that some cogs are beveled on both sides, while others are just beveled on one.
The interesting thing, sort of, is that the SunTour Winner drawing actually shows the bevels on the splined cogs, and shows the bevel on the inboard side (i.e. towards the spokes).

...although it's a bit subtle.
Here's an enlarged look, which should make it easier to notice the bevels...

Amazing how much useful info is in that little drawing!




Good to hear!

Steve in Peoria
Yep, I'd seen that diagram showed the bevelling.
The problem was identifying which bevelling was "the bevelling".
In this case pics will make it very obvious (now that I know the answer):

A32 spoke side with bevelling (and rounded stamped edges):


A32 non-spoke side (with sharp stamped edges):


apparently that's not bevelling.
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Old 10-05-23, 12:38 PM
  #27  
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Looks to me that the image indicates T and P cogs are beveled on both sides. Maybe they're the cogs from which the chain commonly shifts in either direction? Just thinking out loud...

Edit: actually three depiction of the S cog also seems to be double beveled. So much for the "which way do you shift" idea
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Old 10-05-23, 12:55 PM
  #28  
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Originally Posted by smontanaro
Looks to me that the image indicates T and P cogs are beveled on both sides. Maybe they're the cogs from which the chain commonly shifts in either direction? Just thinking out loud...

Edit: actually three depiction of the S cog also seems to be double beveled. So much for the "which way do you shift" idea
My guess was that it's down to the cog spacing - the 'non bevelled' cogs are spaced 2.7mm.
Maybe at 3.1mm you need bevelling for the chain to ease on smoothly.

But purely a guess.
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Old 10-05-23, 02:02 PM
  #29  
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Originally Posted by Aardwolf
My guess was that it's down to the cog spacing - the 'non bevelled' cogs are spaced 2.7mm.
Maybe at 3.1mm you need bevelling for the chain to ease on smoothly.

But purely a guess.
The S,T,P,R cogs all have a raised lip on the inside that acts as a spacer, whist the A cogs are flat and simply stamped. Could it be that manufacturing process difference allowed them to bevel both sides of the cogs with a lip, whereas the flat stamped cogs allowed them to take a shortcut? (with the caveat that orientation now mattered).
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