Rohloff Sprocket Wear Indicator

easy to use sprocket wear indicator tool designed for shimano sprockets and cassettes. comes with instructions for use. robust and reasonable priced. A workshop addition tool.;

This works well for checking the individual cogs in a cassette. In systems where the cogs are removable good cogs can be saved and rebuilt into new good cassettes using good cogs salvaged from other cassettes of the same brand and type.

It takes the guesswork out of what cogs are good enough to put back into service without any danger of accelerating wear on a new good chain. The way cogs are ground these days with asymmetrical teeth around the radius it can be hard telling a good one from a bad. This tool doesn't lie if you use it correctly. It is worth it's salt and will pay for itself fairly quickly if you put a lot of miles on your bikes and wear out cassettes often or you work on bikes for people who do.;

This is the only tool of its kind and a great tool. While there are wear gauges to tell you when the chain is worn this is the only gauge to tell you if the sprockets are worn. After replacing the chain the only way to tell if the sprocket was worn out was to test-ride the bike and see if the chain jumped over the sprocket when you rode uphill. This sprocket wear indicator takes the guesswork out of it. It is labeled HG/IG but it fits on both 3/32" and 1/8" sprockets. My understanding is that while it fits everything else that it will not fit an 11sp cassette very well. Especially useful for testing old freewheels to see if they are worn-out before putting them on your bike. A less expensive version is  Unior Sprocket Wear Indicator One Color One Size .;

I owned this tool for a number of years but eventually sold it off due to it not being very useful. If I worked in a shop I'd use it to demonstrate to customers why they're in need of a new cassette.

Yeah it works but only on 12T through 21T cogs. So forget about your fast-wearing 11T cog if you're running that size cassette and forget about your bigger cogs that admittedly don't wear as quickly due to their increased tooth count but (depending on you and your terrain) might get a whole lot more high-load usage & wear from climbing.

But those weren't the main reasons I stopped using this tool. The main reason was that I could more easily detect a worn cog just by the sound it was making on the cassette -- that extra "clickiness" or else a little extra jumping while in gear.

It would be one thing if cassette cogs are individually replaceable so that just the worn pieces could be swapped out for new. But with most of the cogs being riveted together and individual replacement cogs being pricey and not commonly available this extra level of effort just wasn't worth it for me.

Neat in concept certainly a reliable indicator but in the end it was telling me nothing I didn't already know at the end of a ride.;

This is a really handy tool to have in your toolbox. It easily checks cassette wear and lets you know when it time for a new cassette or replacement sprockets.;