WTB KOM Tough TCS 2.0 CVX i35 Rim
KOM Tough is the heavier of WTB's two KOM aluminum layups: the KOM profile family with thicker walls, for riders who have dented lighter rims or ride loaded. At 35mm inside the KOM Tough i35 suits 2.4 to 2.6in trail and enduro tires. The rim we build with is WTB's current TCS 2.0 version with CVX (29in W020-0647; 27.5in W020-0646), 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 Tough i35 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
35mm is where KOM Tough turns into an enduro rim: a 2.5in tire sits square and supported, the casing stops folding at low pressure, and the extra width spreads a hard landing over more of the rim.
It suits 2.4 to 2.6in trail and enduro tires. In our strength model it scores 5.27 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 Tough i35 measures 603 in 29in, 565 in 27.5in, a few millimeters less than the rim it replaced, and those are the figures we cut spokes to.
Specifications
| Wheel size | Inner width | ERD | Weight | Drilling | WTB part |
|---|---|---|---|---|---|
| 29in | 35mm | 603 | 577g | 32 | W020-0647 |
| 27.5in | 35mm | 565 | 542g | 32 | W020-0646 |
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.
WTB's drawing of the CVX profile gives 40mm outer width and 17.6mm depth.
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, 32 hole, disc brake only, for external nipples. Listed weight is 577g in 29in, 542g 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 Tough i35 is live in our Custom Wheel Program for tandem and e-bike, MTB single-speed, mountain bike and fat bike builds. Build a custom wheel around the KOM Tough i35 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.
WTB's testing and certifications
WTB (Wilderness Trail Bikes, California) builds its rims around the TCS tubeless system. WTB states the Beadlock bead profile is "Designed to ISO/ETRTO standards", that 4D drilling angles each spoke hole toward the hub flange, and that most alloy rims are sleeve-jointed, the rim ends hydraulically pressed over an extruded aluminum insert reinforced with industrial epoxy. KOM and HTZ rims use 6069 aluminum for its "high tensile and fatigue strength"; HTZ e-bike rims add 20% wall thickness over KOM Tough.
Warranty: WTB guarantees its products "for at least two years"; Ci24/Ci31 carbon 36 months. CZR carbon rims carry a Limited Lifetime warranty for the original owner plus the Ride With Confidence Guarantee: a CZR broken while riding is replaced free with a free rebuild; one damaged while not riding is replaced at 50% off current MSRP.
Published limits: maximum spoke tension 110-120 kgf on KOM, HTZ and CZR rims; max rider weight 265 lbs for the CZR i23 and 300 lbs for the CZR i30. No per-rim maximum tire pressure is published and no ISO 4210 or UCI certification is claimed.
WTB's videos
Certifications
- ISO/ETRTO bead design — WTB states its TCS Beadlock profile is "Designed to ISO/ETRTO standards" and CZR TCS 2.0 is ETRTO/ISO compliant (source)
- CVX spoke-bed technology — Stated as patented by WTB (source)
Sources on WTB's site:
- Rim Technology - WTB
- Warranty - WTB
- Ride With Confidence Guarantee - WTB
- CZR i23 Rim - WTB
- CZR i30 Rim - WTB
The figures, certificates and media above are WTB's own. ProWheelBuilder does not run these tests; our part is the wheel we build on the rim.
Building it at ProWheelBuilder
Spoke length comes from the measured hub and this rim's real ERD — 603 in 29in, 565 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.
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. Lace this into a wheel here and the finished wheel gets our own one-year warranty as well as the maker's. For twelve months we replace broken spokes however they broke, and the work on the wheel is on us - truing, re-tensioning, a rebuild where it is needed. If the rim or hub is covered by its manufacturer we put the claim in and chase it; if it is not, we supply an eligible replacement rim or hub at 25% off the current retail price. Carriage both ways is the customer's, and this does not cover wheels built from parts you send in.
Full terms are on our Policies & Warranty page.
KOM Tough i35 questions
Is this the CVX version?
Yes. The KOM Tough i35 we build with is WTB's TCS 2.0 rim with CVX (29in W020-0647; 27.5in W020-0646).
i35 or i40?
The i35 suits 2.4 to 2.6in tires; the i40 is for 2.6in and plus tires. Under about 2.5in the i40 leaves the casing stretched flat, so match the rim to the tire.
What tires fit?
2.4 to 2.6in trail and enduro tires.
What is the ERD?
603 in 29in, 565 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?
32 hole.
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.
