KOM Light i21

Discover the KOM Light i21 rim, ideal for adventure and gravel cycling. Its lightweight and rugged design ensures durability and performance on all terrains. Check it out today!

$125.95

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Variant

SKU: W020-0579

Free shipping $100+Contiguous US only

Free shipping for orders over $100, excluding deliveries to Hawaii and Alaska.

Orders are typically processed within 1-2 business days and shipped via UPS standard ground service from our warehouse in San Rafael, California.

30 day return policy

Decide a product wasn't for you? Return any unused product for up to 30 days with no questions asked.

Warranty policy

We guarantee our products for at least two years.

Usage Adventure Road / Gravel / Cyclocross

Product description

Our lightest alloy rims, the KOM Light family combines high-end performance and proven tubeless dependability to create an affordable rim attainable by all. KOM Light rims employ an open cavity design to make them sprightly enough for 200 miles of gravel, while strong 6069 aluminum alloy also make them resilient enough to endure daily hammering on your trail bike. Choose KOM Light when you're looking for high-end performance at a low-key price.

KOM Light i21

$125.95

Open-Cavity Design

Open-cavity rim profile eliminates unnecessary weight while also reducing radial stiffness to create a smoother ride. Open-cavity rims are the top choice of drop bar and XC riders wanting to minimize weight while also improving rim compliance for less overall body fatigue at the end of a long day.

Dependable 6069 Alloy

Many years of rim development and success have confirmed 6069 to be the perfect aluminum alloy blend for both drop bar and mountain bike rims. Our extensive testing shows other 6000-series alloy to be less ding-resistant, while stiffer 7000-series alloys result in a harsher ride feel and tend to increase pinch flats.

4D Angled Spoke Holes

Drilling spoke holes at an angle eliminates binding and lateral loading of the spoke and nipple interface. It also allows spoke tension to be more evenly dispersed on the nipple rather than loading one side more than the other. Allowing the spoke to depart the rim at a natural angle increases the longterm durability of both the spoke and nipple.

TCS Solid Strip

Durable nylon strip that lies between the rim and tubeless tape to prevent tubeless tape from pushing into the spoke holes and ensures a smooth interface between the 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.

21mm inner rim width

Road and commuter bikes with narrow tires of 30mm or less are best paired with a 21mm inner rim width. KOM Light rims are also best suited for this usage because of their balance of lightweight performance and proven dependability. Choosing wider rims for use with tires narrower than 30mm will provide unnecessary exposure to the sidewall of the tire.

Features

Open-Cavity Design

Dependable 6069 Alloy

4D Angled Spoke Holes

TCS Solid Strip

21mm inner rim width

Technology

TCS (Tubeless Compatible System) is our industry-leading tubeless rim/tire system designed to international ETRTO and ISO standards.

6069 is the perfect aluminum alloy for bicycle rims due to its high tensile and fatigue strength, minimal weight, and excellent anti-corrosion properties.

Spoke holes are drilled at an angle to match the natural spoke path between a rim and hub. Eliminates binding and lateral loading of the nipples to increase wheel durability.

Rim ends are hydraulically pressed over an extruded aluminum insert that matches the inner cavity of the rim and is further reinforced by industrial epoxy.

Sloped rim valley allows the bead of the tire to easily and smoothly move into place during installation and inflation.

Installed between the rim and tubeless tape to prevent tape from sagging at each spoke hole and make tire inflation easier while also preventing puncture from a broken spoke.

Specs

SPECIFICATIONS: (Max spoke tension range: 110-120KgF)

Product	Wheel Size	Inner Width	*Weight	Hole Count	ERD	Rim Size Designation	Part number
KOM Light i21 29" TCS 2.0 Rim, 28 hole Black, PV	700 / 29"	21mm	431g	28	605	21-622	W020-0579
KOM Light i21 29" TCS 2.0 Rim, 32 hole Black, PV	700 / 29"	21mm	431g	32	605	21-622	W020-0555

*KOM Light rims weighed with Solid Strip installed.

Frequently Asked Questions

HOW DOES RIM WIDTH AFFECT TIRE VOLUME AND PROFILE?

Wider rims will cause a tire to also have a wider width, with more air volume within the tire and a flatter tire tread profile than designed for. As a general rule of thumb, a 2mm increase or decrease of inner rim width will result in a tire section width increase or decrease of 1mm. For example, our Nano 40 tire has a tire section width of 40mm on a 21mm inner rim width, however it will have a tire section width of 41mm on a 23mm inner rim width.

WHICH TUBELESS VALVE LENGTH IS BEST FOR THIS RIM?

All of our alloy rims work great with a 34mm valve stem. If you are using a deeper dish rim, like our CZR i23 rim, then we recommend the 46mm long valve stem. CZR i30 rims accept either length of valve.

WHICH WIDTH OF TCS TAPE SHOULD I USE TO SET THIS RIM UP TUBELESS?

WTB recommends using tape that is 5mm wider than the inner rim width. All WTB rims have the inner rim width listed in the name (i.e. KOM Light i21 rim requires 26mm TCS Tubeless Tape).

TCS (Tubeless Compatible System)

TCS (Tubeless Compatible System) is our standardized tubeless system designed to meet international ETRTO standards and deliver unbeatable tubeless performance and reliability. TCS components reduce weight, increase traction, virtually eliminate flats and has established itself as the most dependable tubeless system available. Our TCS system includes tires, rims, tape, sealant and valves to provide a comprehensive package of unrivaled tubeless performance and reliability.

PRESS REVIEWS

"Would recommend"

- NSMB

Free shipping $100+

Excluding deliveries to Hawaii and Alaska.

30 Day Return Policy

Return any unused product for up to 30 days.

WARRANTY POLICY

We guarantee our products for at least two years.

Need help?

KOM Light i21

KOM Light i21

Open-Cavity Design

Dependable 6069 Alloy

4D Angled Spoke Holes

TCS Solid Strip

21mm inner rim width

Open-Cavity Design

Dependable 6069 Alloy

4D Angled Spoke Holes

TCS Solid Strip

21mm inner rim width

Frequently Asked Questions

Customer Reviews

PRESS REVIEWS