The Easiest Way To Determine If It's Time To Replace Your Chain
To alleviate poor shifting and uneven drivetrain wear, most manufacturers recommend chain replacement at or before 0.6% stretch.
Now you can quickly and accurately determine the wear and stretch of any road, MTB, gravel or e-bike chain with the Unior Pro Chain Wear Indicator.
Simply insert the chain checker's pins into two links, press the swing arm gauge tight, and then check the gauge window for an accurate reading.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
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BTD image does not match product
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.
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Q & A with home mechanic Tommy Tuite.