WTB KOM Light i21 Rim

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Sprightly enough for 200 mile of gravel, resilient enough for daily trail riding, the WTB KOM Light i21 combines high-end performance and tubeless dependability in one of the lightest WTB alloy rims.


  • 21 mm inner rim width is best suited for road and commuter bikes with narrow tires of 30 mm or less
  • Open-cavity rim profile eliminates unnecessary weight while also reducing radial stiffness to create a smoother ride
  • Crafted from strong, dependable 6069 aluminum alloy to endure daily hammering on your trail bike
  • 4D angled spoke drilling eliminates binding and lateral loading, and disperses tension more evenly over a greater area
  • Durable nylon TCS Solid Strip lies between the rim and tubeless tape to prevent the tape from pushing into the spoke holes, ensuring a smooth interface between tire and rim
  • The smooth surface makes it easier to mount a tire by preventing air from escaping around the bead at each indent during inflation
  • Solid Strip also protects the airtight system from puncture in the case of a broken spoke
  • TCS (Tubeless Compatible System) is a standardized tubeless system designed by WTB to meet international ETRTO standards
  • TCS components reduce weight, increase traction and virtually eliminate flats for a dependable tubeless system


View all WTB Bike Rims

Technical Specs

Best Use

Gravel Cycling

Urban Cycling

Tire Type

Tubeless Ready

Wheel Size

29 inches

Spoke Hole Count


Internal Rim Width

21 millimeters

External Rim Width

25 millimeters

Effective Rim Diameter

605 millimeters

Rim Depth

17.75 millimeters

Brake Compatibility

Disc Brake

Rim Material


Rim Bead Type


Rim Symmetry


Valve Type


Tubeless Compatible



431 grams



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