Bicycle Mechanics - Does it matter how I put a cassette together?
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03-12-11, 11:42 PM
I'm new to cassettes (still in the cluster era - but learning). I recently bought a 13-26 Campy cassette to replace my 13-23 cassette. I put it together with no regard to the arrows which now I believe I was supposed to line up as I placed each chain ring on the cassette. I rode off oblivious and did not have noticible problems. Later when I was cleaning the old cassette, I noticed what seemed to be "line up" indicators. I took my new cassette apart and lined things up. Sorry for the long introduction to my question which is rather simple. Would it have made any difference if I had left the chainrings on as they were -totally random? Why or why not? Thanks for any thoughts.
03-13-11, 12:18 AM
If it worked to your satisfaction it's no problem. In theory, the arrows should be lined up for best shifting performance.
03-13-11, 12:20 AM
Well the hub body has different sized notches that I think can only be installed one direction on 8,9,10 or 11 speed, so not sure how it could have been put together wrong.
03-13-11, 12:27 AM
All of the notches are the same on this 1994 8 speed campy hub, though I did note that the splines on the new cassette were all the same except one was narrower on each chainring. Not sure why.
03-13-11, 12:48 AM
I forgot about the older free hub sorry.The newer bodied 8 speed free hubs have a notch for that smaller tab of the cog, there is a name for it but I don't remember what. So with the way you now have it all of the ramps on tghe cogs should line up and the shifting should ramp up gear to gear a little faster and smoother.
03-13-11, 08:32 PM
Thanks for the explanation of the smaller tab on this new cassette. It all comes together now.
The one different key or timing notch is what puts the glide into xxx-glide shifting. It ensures that the shift gate is positioned where the chain will meet the new sprocket oriented to engage smoothly. phased and gated shifting serves a similar purpose to synchro-mesh in manual auto transmissions.
Failure to line up the timing marks or key notches won't in any hurt when running on any sprocket, but can cause delayed or sloppy shifting, or that bit of slippage that folks riding before gated shiftinmg remember so fondly.
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