KOM Tough i40

Built for bashing, whether on a gravity shred sled or fully loaded bikepacking rig. KOM Tough rims are extruded from top-tier AL 6069 alloy to provide utmost durability at a reasonable weight. Our legendary I-Beam construction has evolved to further reinforce the rim with dual support beams that provide increased strength and stiffness for the world’s most aggressive riders.

$131.95

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Variant

SKU: W020-0571

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 Trail / Enduro

Product description

Simply put, KOM Tough rims were built for bashing. We designed them to overcome everything in their unforgiving path. KOM Tough rims are extruded from top-tier 6069 aluminum alloy for unbeatable durability at a reasonable weight, while Dual I-Beam supports further increase strength and lateral stiffness for the world’s most aggressive riders. WTB's unique Solid Strip integration also ensure they'll be the easiest to mount and most reliable tubeless rims you'll ever owned. KOM Tough has been proven on the toughest tracks of the Enduro World Series, depended on for daily trail rides, and trusted while bikepacking in remote regions of the world.

Dual I-Beam Support

Two vertical supports within the inner cavity drastically increase the strength and lateral stiffness of our KOM Tough rims. These additional reinforcements counteract spoke loads, which improves stiffness and minimizes deflection in rocky, unpredictable terrain.

Dependable 6069 Alloy

Many years of rim development and success have confirmed 6069 to be the perfect aluminum alloy blend for 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.

40mm inner rim width

Rims with an inner rim width of 35-40mm are designed for tires widths ranging from 2.6-3.0". Pairing a wider rim to wider tires ensures optimal sidewall support and tire volume, which allows riders to run lower air pressure and fully benefit from the advantages of 2.6-3.0" tires. Preference will determine which of the two widths is best for you, but take into account that the 35mm width will provide a rounded tire profile while the 40mm width will provide a flatter tire profile.

Features

Dual I-Beam Support

Dependable 6069 Alloy

4D Angled Spoke Holes

TCS Solid Strip

40mm 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.

Two vertical supports drastically increase rim strength while also improving lateral stiffness and minimizing deflection in rocky, unpredictable terrain.

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.

Internationally standardized to ensure rim and tire compatibility are as consistent and user-friendly as possible for both WTB’s products and those of our competitors.

Specs

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

Product	Wheel Size	Inner Width	*Weight	Hole Count	ERD	Rim Size Designation	Part number
KOM Tough i40 27.5" TCS 2.0 Rim, 32 hole Black, PV	27.5"	40mm	590g	32	568	40-584	W020-0571
KOM Tough i40 29" TCS 2.0 Rim, 32 hole Black, PV	29"	40mm	627g	32	606	40-622	W020-0572

*KOM Tough 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 are best paired 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 Tough i40 rim requires 45mm 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

"Stiff & durable"

- Bike Mag

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 Tough i40

KOM Tough i40

Dual I-Beam Support

Dependable 6069 Alloy

4D Angled Spoke Holes

TCS Solid Strip

40mm inner rim width

Dual I-Beam Support

Dependable 6069 Alloy

4D Angled Spoke Holes

TCS Solid Strip

40mm inner rim width

Frequently Asked Questions

Customer Reviews

PRESS REVIEWS