The manufacturers of the world's greatest lubricants now bring you a practical and economical chain elongation (stretch) gauge.  For a longer-lasting drive train, the ProLink Chain Gauge is your best friend!

Instructions

The ProLink Chain Gauge is easy to use:

1.  Hook one end of the chain gauge into a chain.

2.  Gently lower the other end of the chain gauge along the line of the chain allowing the tip of the gauge to enter the gap between the rollers.  If the tip of the gauge will not enter the gap between the chain rollers then there is less than 50% wear to your chain.

3. Read off the gauge the percentage of wear level with the top of the chain where it has entered the gap between the rollers.

4.  Check the reading by measuring the level of wear in at least 3 different locations on the chain with your ProLink Chain Gauge.

NOTE: Do not apply force to the measuring arm of the gauge by forcing it into the gap between the chain links as this will give you an inaccurate reading and cause damage to your ProLink Chain Gauge.

WARNING: Always take care when first using a new chain with a used cassette to ensure that the new chain does not slip on the worn teeth of the used cassette. An out of the saddle slip of a new chain on a used cassette may result in the loss of control of your bicycle and injury and damage to person and/or property.  

PRO-TIP

If your chain is showing 75% wear then the replacement of the chain before further wear occurs will possibly enable you to avoid having to replace your cassette.  If you leave replacement of your chain until 100% wear is shown you will most likely have to replace your cassette along with replacement of your chain.

The replacement of your chain at an early stage will in effect save you money by not having to replace your cassette.  Thus the chain gauge will pay for itself in no time and thereafter save you money by telling you when you should consider replacing your chain before you need to replace your cassette.