WTB KOM Light TCS 2.0 CVX i30 Rim
KOM Light is WTB's lighter KOM aluminum layup: the KOM profile family with less material, for riders who want the width without the weight. At 30mm inside the KOM Light i30 suits 2.3 to 2.6in trail tires. The rim we build with is WTB's current TCS 2.0 version with CVX (29in W020-0640 / W020-0639), the part our distributor stocks. WTB design and make the rim; ProWheelBuilder is an independent wheel builder in Georgia, not the manufacturer.
We sell it as a finished wheel: choose the hub, spokes and nipples and we lace, tension and true it by hand here.
Design and construction
The KOM Light i30 is a sleeve-jointed 6069 aluminum rim with WTB's TCS tubeless bead, the Tubeless Compatible System that seats a tire with a floor pump and holds it at low pressure. 4D drilling angles each spoke hole toward the hub flange it serves, so the nipple sits straight and the spoke is not bent where it leaves the rim.
How it rides
30mm is the trail width in the lighter layup: it supports a 2.4in tire properly, and you give up some of KOM Tough's wall thickness to save weight.
It suits 2.3 to 2.6in trail tires. In our strength model it scores 4.84 out of 10 — read that against the other rims in the configurator rather than on its own.
TCS 2.0 with CVX
CVX is WTB's patented spoke bed. In WTB's words it strengthens the bed “without increasing weight, by thickening material where it's needed and removing where it's not”, so the material sits around the spoke holes, where an alloy rim cracks. TCS 2.0 adds WTB's Solid Strip under the tubeless tape, which makes a tubeless tire easier to seat and seal.
CVX moved the ERD as well: the CVX KOM Light i30 measures 603 in 29in, a few millimeters less than the rim it replaced, and those are the figures we cut spokes to.
The 27.5in KOM Light i30 is WTB's TCS 2.0 rim without CVX (ERD 568, 457g); it is not currently in stock at our distributor, so it shows as unavailable.
Specifications
| Wheel size | Inner width | ERD | Weight | Drilling | WTB part |
|---|---|---|---|---|---|
| 29in | 30mm | 603 | 498g | 28 and 32 | W020-0640 / W020-0639 |
| 27.5in | 30mm | 568 | 457g | 32 | TCS 2.0, no CVX |
Disc brake only, external nipples, aluminum. WTB publishes a maximum spoke tension of 110–120 kgf for its KOM rims, which is what we build to.
About this listing
This is the rim on its own, as a component of a hand-built wheel. Pick the diameter and drilling above and we build the wheel around it.
Sizes, fit and compatibility
Listed in 29in and 27.5in, 28 and 32 hole in 29in; 32 hole in 27.5in, disc brake only, for external nipples. Listed weight is 498g in 29in, 457g in 27.5in.
Spoke head is decided by the hub, not the rim: this rim builds equally well with J-bend or straight-pull spokes, and the configurator only offers the spokes that match the hub you pick.
Put it in a custom wheel
The KOM Light i30 is live in our Custom Wheel Program for MTB single-speed and mountain bike builds. Build a custom wheel around the KOM Light i30 and the configurator opens with this rim pinned at the top of the WTB list, ready for you to choose the hub, drilling, spokes and nipples. It validates every combination as you go, so you cannot assemble a wheel we would not build.
Testing, standards and warranty at WTB
WTB test the KOM rims to their own impact and fatigue standards and warrant them against defects in materials and workmanship. WTB state the TCS Beadlock bead profile is designed to ISO/ETRTO standards, and that the CVX spoke bed is patented. Their rim technology page covers both, and the 4D drilling that angles each spoke hole toward the flange it serves.
ProWheelBuilder does not test rims. We report what WTB publish and build to it.
Building it at ProWheelBuilder
Spoke length comes from the measured hub and this rim's real ERD — 603 in 29in, 568 in 27.5in — rather than a catalog average, so the nipples seat properly instead of running out of thread. Every wheel is laced, tensioned and trued by hand in Georgia, and we check tension around the wheel rather than trusting a single reading.
Labor is included in the wheel price. Tubeless tape and valves are an option at build time.
What does the i30 width give me?
30mm internal is the trail width, sized around 2.3 to 2.5in tires. That is wide enough to stop a modern trail casing rolling under you when you lean on it in a corner, which is what lets you run the lower pressures the tire was designed for. At 498g it is the middle of the family for weight.
If your tires are nearer 2.1in this is more rim than you need and the tread will sit flat; the i23 suits that better. If you are on 2.5in and riding hard, look at the i35.
For the build: 498g, and a published ERD of 603. Spoke lengths come from that figure and the hub you pair it with, so tell us the hub and we will work them out. The other widths in the KOM Light family are separate listings.
Warranty
WTB's warranty. WTB's cover depends on the rim: CZR and CGR carbon rims carry a limited lifetime warranty to the original owner, Ci24 and Ci31 carbon rims three years, and every other rim 24 months, all against defects in material and workmanship. A CZR rim broken while riding is replaced free; damage from a non-riding incident is replaced at half the current list price. Claims must be raised within 60 days of finding the defect.
ProWheelBuilder. Any wheel we build on this part carries ProWheelBuilder's one-year warranty in addition to the manufacturer's. Broken spokes are replaced for a year whatever the cause, and all wheel-side labor is included - truing, re-tensioning, rebuilding. Where the maker covers a failed rim or hub we handle that claim for you; where they decline, an eligible replacement comes at 25% off current retail. The customer covers shipping in both directions. Components supplied by the customer are not covered.
Full terms are on our Policies & Warranty page.
KOM Light i30 questions
Is this the CVX version?
Yes. The KOM Light i30 we build with is WTB's TCS 2.0 rim with CVX (29in W020-0640 / W020-0639). The 27.5in size is the earlier TCS 2.0 rim without CVX.
KOM Light i30 or KOM Tough i30?
The same width and the same CVX spoke bed; KOM Tough has thicker walls and weighs more. Pick Tough for hard trail riding, Light where weight matters more than rock strikes.
What tires fit?
2.3 to 2.6in trail tires.
What is the ERD?
603 in 29in, 568 in 27.5in. It is the measurement spoke length is calculated from — get it wrong by a couple of millimeters and the spokes either bottom out in the nipple or leave thread showing.
Is it tubeless-ready?
Yes. TCS is WTB's tubeless bead system; we tape the rim and fit a valve when you choose the tubeless option.
Rim brake or disc?
Disc only. There is no machined braking surface on the sidewall.
What drilling is available?
28 and 32 hole in 29in; 32 hole in 27.5in.
Not sure? Email info@prowheelbuilder.com (fastest) or leave a voicemail on 470-253-0929 — you will be talking to the people who build the wheels.
