Introducing the specialized top cap chain tool a chain tool is probably one of the most important tools to take with you on a ride as your chain could snap or split at any given time due to a number of things this is the only top cap that doubles up to be a reliable chain tool as well the chain tool will fit an 1 18 inch steerer tube with 32mm of available depth and only adds 25 grams to the overall weight of your bike the chain tool itself is compatible with 8 to 11 speed chains and has th