Runwell Checker NJS chain tool
USA orders totaling $100 or more receive free shipping.
This applies to standard shipping in the contiguous 48 states and military APO/FPO addresses only. Oversized items are excluded from the free shipping offer.
All other shipping charges are shown in the cart before checkout. Free shipping does not apply to orders shipping outside the USA.
For complete information, please see our Shipping page.
If you are a local customer choosing the Store Pickup option at checkout,
please wait to receive an email saying your order is ready before coming to pick it up.
Local orders may not be ready the same day they are placed.
⚠️ IMPORTANT NOTICE: Effective 10/14/22, the option for local pickup is unavailable because we are in the process of moving to a new location. Until our new retail store opens in early 2023, all orders placed online will be shipped.
Returns for eligible products are accepted within 30 days of the purchase date. Some exclusions apply.
For complete information, please see our Returns page.
Unlike chains using traditional quick links, NJS chains feature a tiny bolt and 6mm square nut to affix the chain's ends together and everyone using a NJS chain has experienced that the square nut was loose or lost at least once.
Made from chrome plated chromoly steel, strong enough to last a lifetime and featuring a beautifully machined knurled handle, this tool allows you to easily check that your master link nut is secure before a race, before going out, or on breaks during a ride.
Designed by a Keirin track inspector very experienced with NJS standards, the Checker is used during bicycle inspection before races. It is also nominated by head velodrome mechanics in New Zealand and Denmark as a tool to be used at the Tokyo Olympics.
• made in Japan
• length: 125mm
• weight: 88g