Park Tool CC-3.2 Chain Wear Indicator D4 Significant watt savings when running

Significant watt savings when running larger tires at lower pressure

Auto start / stop

Now in a matching RED AXS™ finish to complete the groupset

1x 25mm mounting strap with magnetic hook

Park Tool CC-3.2 Chain Wear Indicator D4 Significant watt savings when runningA worn bicycle chain can cause poor shifting and in time can even cause excessive wear to the derailleur and rear cogs, causing a much more expensive problem. That's why bike component manufacturers recommend chain replacement at regular wear intervals. The Park Tool CC 3. 2 is a go no go gauge designed to accurately indicate when a chain reaches 0. 5% and 0. 75% wear (or "stretch"), the points at which most chain manufacturers suggest replacement.