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25 years ago I worked in a LBS that had a tool for checking the wear on a cassette, well freewheel in those days. I guess it was for 5-6 speeds. I've never seen one since and haven't be able to find either an old one or a modern equivalent online.
Do such tools exist or do we just wait until the new chain slips or wears too fast?
I don't need one, I'm just curious as just about every other tool for bikes exists!
Something digital would be good where you took a photo from the side and then superimposed it over a picture of a new one (from a small database) then calculated the difference.
Any app developers out there?
They do exist. I was looking for one a while ago, but the ones I could find were rather more expensive than I could justify for a home toolbox. Think the cheapest was about £40.
That's not a bad price. Might buy one after all Thanks!
I have one of the Rolhoff cassette measuring tools, I rarely use it and looking at the profile of the teath seems to work ok.
This one by Unior works on 12-21 tooth sprockets. I don't think it'd be much use for me as I'll probably wear the largest cogs on the 12spd cassette first.
https://uniortools.com/eng/product/1658-2P-sprocket-wear-indicator
Any reason why a chain whip wouldn't do the same job as the Rohloff? Obviously the Rohloff is not a chain whip, so I'm not thinking of using it for that, just trying to think why my ancient Park whip can't do the job.
Taken one step further then, or maybe backwards but why not use a length of new chain?
Taken one step further then, or maybe backwards but why not use a length of new chain?
You could if you fashion a handle to attach to it, as with the above tools - you need the tension in the chain to get a good indication. As mentioned above though, they only really work properly on a particular range of sprocket sizes.
Park Tool did a video on the indicators of cassette wear: