Park Tool HBH-2 bicycle and mountain bike handlebar clamp
Stabilises the bike during maintenance
€28.37
Price : €29.95 (10 reviews)
Our opinion
A very useful tool that will save you money. By monitoring the wear on your chain, you can avoid having to replace your cassette and/or chainrings prematurely. Like wine, the TL-CN42 tool should be compulsory! ;)
Bruno V.
Road specialist
The Shimano TL-CN42 tool is a wear tester for bicycle chains. If you want to ride in good conditions, it is essential to check the condition of your Shimano chain regularly. This involves checking the length using the TL-CN42 tool; the check takes just a few seconds.
It is strongly recommended that you replace a chain before it becomes excessively worn. The consequences can be significant, leading to premature wear of other drivetrain components such as sprockets, chainrings and derailleur pulleys.
The Shimano TL-CN42 tester is compatible with all Shimano bicycle chains.
Technical specifications
Official Shimano tool
Compatible with 9 to 12-speed systems
High-precision laser cutting
Heat-treated stainless steel
Brand: Shimano
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Sébastien B. 
Published Jan 29, 2026 at 06:37 pm (Order date: Jan 03, 2026)Good (Translated review)
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