The Park Tool MT-40 Multi-Tool folded, click to enlarge
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Item # MT-40

(discontinued) / Tools / Multi-Tools


The Park Tool MT-40 is a high quality folding take-along bike tool that features all the essential tools needed for an on-the-ride adjustment or emergency repair. The MT-40 features a selection of hex and star driver wrenches for most bolts and fittings found on a bicycle, as well as a universal screwdriver for derailleur adjustment. Also features a chain breaker tool for emergency chain repair and replacement, and a CO2 cartridge inflator adaptor to assist in reinflating flat tires — compatible with most bicycle tubes with a Presta valve.

Built with forged aluminum side plates and hardened and plated tools to withstand years of use. With its compact size, the MT-40 is the perfect size for a saddle bag or backpack.

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MT-40 Features


  • 2.5, 3, 4, 5, 6 and 8 mm hex wrenches
  • T25 & T30 Torx®-compatible drivers
  • Combo cross/straight tip screwdriver
  • 5- to 12-speed compatible chain tool*
  • CO2 cartridge inflator adaptor
  • Key ring holder
  • Dimensions: 80 x 52 x 22 mm (3.1" x 2" x 0.9")
  • Weight: 243 grams (8.57 oz.)

*NOTE: The MT-40 chain tool will not peen Campagnolo 11-speed chain rivets (see the Park Tool CT-4.3 or CT-6.3). The pin of the chain tool is replaceable — part #985-1

Support Videos


  • Factory Jackson Review The MT-40 is the fully loaded Park Tools multitool, with enough tools to build a bike from the ground up. It’s the tool you want for long rides as it’ll help you get out of pretty much any trail side nightmare.

Parts & Accessories


Replacement Chain Tool Pins

MT-40 Multi-Tool