UniorPro Chain Wear Indicator (Return to Product Page)

I did not purchase this tool from BTD, but I like it so well I felt compelled to comment.

As the previous commenter noted, the tool does not have a 0.6 marking. That said, if you check your chain often, this tool lets you assess how quickly it is wearing and allows you to anticipate when you will need to replace. It's really nice to have more information than simply go/no go.

I have a Park Chain Checker, which measures when your chain is at .50 or .75 stretch. It works. I thought it might be helpful to have a gauge that measures a wider variability, and the Unior Pro seemed to fit the bill. As stated in the description, 'most manufacturers recommend replacement at or before .6% stretch.' I want to be that guy that replaces the chain just before .6% stretch.

Here's the thing: The calibration marks shown in the description photo on the BTD site do NOT match the product I received. Photo shows calibration marks for 0; 0.2; 0.6; with remaining marks obscured. Product in my hand shows 0; 0.25; 0.75; 1.0. Consequently, if 'recommendation is: 'replace chain at or before .6,' I'm still left guessing when my chain hits 0.6 with this tool.

That said, I will say the tool is easy to use, and that the measurement appears consistent with the Park chain checker, as it measured a just over .50 stretch on my mountain bike chain, just as my Park chain checker went through at the .50 mark.