Shifting issues prompted me to check the sprocket spacing on a problematic 10sp cassette; which in places looked wonky.
The plain shanks of 0.1mm increment drill bits were used as go / no go gauges around the circumference of the gap that separates each sprocket from the next.
The short of it is that pitch ranged from between 3.8 and 4.3mm, with the average coming in at 3.97mm which correlates well with Bike Gremlin's published value of 3.95mm.
This seems like an enormous variation; and unsurprisingly the shifting issues correspond with sprockets subject to the most erroneous spacings - I can't get a clean shift in both directions across those with the largest spacing; only in one direction at a time as cable tension is manipulated.
This seems like a really weird fault - has anyone else experienced similar? One pair of affected sprockets are fairly large so I can see how one could perhaps be warped / dished; however the other problem area is between the two smallest sprockets and I'm at a loss to see how this could have happened..
The plain shanks of 0.1mm increment drill bits were used as go / no go gauges around the circumference of the gap that separates each sprocket from the next.
The short of it is that pitch ranged from between 3.8 and 4.3mm, with the average coming in at 3.97mm which correlates well with Bike Gremlin's published value of 3.95mm.
This seems like an enormous variation; and unsurprisingly the shifting issues correspond with sprockets subject to the most erroneous spacings - I can't get a clean shift in both directions across those with the largest spacing; only in one direction at a time as cable tension is manipulated.
This seems like a really weird fault - has anyone else experienced similar? One pair of affected sprockets are fairly large so I can see how one could perhaps be warped / dished; however the other problem area is between the two smallest sprockets and I'm at a loss to see how this could have happened..
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