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Folding Chain Tool - CT-6.3 - from Park Tool USA


Park Tool

The CT-6.3 chain tool from Park Tool is used for removing, installing and sizing chains used on derailleur equipment. Folds nice and small to allow carrying when cycling.

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This neat little tool works like a heavy workshop tool, but folds compactly for taking on the road or trail. (and because it folds, it keeps the grease away from your clothes)


  • cast steel body
  • stainless steel case
  • replaceable pin"loosening shelf" for tight links. 
  • Weighs just 168g (or 6oz)
  • Works on most derailleur chains (including 10-speed chains). 

The CT-6.3 uses the 985-1 replacement pin.

Park Tool Ref: CT-6.3

Before you purchase or use this tool:

Splitting and joining derailleur chains varies slightly based on the brand and model of chain.

Some chains such as current Shimano and Campagnolo models require the use of a special replacement rivet - so don't split the chain unless you have one.

Chains from other manufacturers such as SRAM, KMC and Wipperman use a special "master link" to break and re-fix the chain - I remember when all chains used to be like this!

In these cases the chain tool will only be used for resizing the chain by removing some of the rivets / links.

Some chains use rivets which are partially pressed out (but not all the way) to allow the chain to be separated and then re-used to re-join the chain.

Please refer to your chain manufacturers information for full details.

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