The Park Tool CT-4.3 Master Chain Tool with peening anvil installing chain rivet, click to enlarge
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Item # CT-4.3

(discontinued) / Tools / Chain

Master Chain Tool with Peening Anvil

Designed to work with the tight tolerances and narrow profiles of 10 to 12-speed chains, but also works on most other 5 to 9-speed derailleur chains. The CT-4.3 is a powerful, precise tool designed to quickly and accurately remove and install chain rivets. Without a doubt the most accurate chain tool we’ve ever built.

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CT-4.3 Features

  • Compatible with 5 to 12-speed derailleur chains
  • Includes removable peening anvil for peening Campagnolo® 11 and 12-speed chains
  • Integrated Link Pocket ensures precise alignment
  • Perfectly contoured cushioned handles
  • Precisely machined investment cast body and components
  • Replaceable rotating pin (part # CTP-4K)

NOTE: The CT-4.3 is NOT compatible with chains that use a non-standard/non-hourglass shape such as the SRAM® RED® AXS® 12-speed and the Shimano® XTR® 12-speed.

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Replacement Parts


Replacement Chain Tool Pin Kit

CT-4.3 Master Chain Tool with Peening Anvil