Concept Speed 29″ MTB Carbon Race Rim – 28H

340g of carbon, built for riders who know exactly what they want. Bring your own hub, choose your spokes, and build the XC or trail wheel that fits your riding, your weight, and your terrain. The Concept Speed Carbon Race Rim gives you a serious foundation without locking you into someone else’s complete wheel spec. 

A custom wheel is only as good as the rim it starts with. Pick the wrong one and you are chasing trueness for the next two seasons. Pick this one and you get 340g of precisely laid carbon with a published tension spec, a hookless tubeless profile that works, and the flexibility to run 28H or 32H depending on how hard you ride.

The hookless bead is tubeless only. That is not a limitation, it is the point. Lower pressures. More traction. A tyre that grips the trail instead of pinballing off it. The 30mm internal width supports 2.3 to 2.6-inch tyres at up to 3 bar (44 psi) and seats them consistently. No wrestling with the bead, no pressure spikes, no surprises mid-race.

Intermediate-modulus fibre for toughness and impact resistance. High-modulus fibre where the layup demands stiffness and minimum weight. No system weight limit. Five-year manufacturer warranty, 3-year Crash Replacement Warranty at 50% of the current retail price, The Trust Guarantee (register within 30 days of purchase at conceptspeed.co.za/register). The rim earns its place on its spec. The support earns it again.

Rim Specifications:

5 Reasons This is the Right Carbon Rim for Your Next MTB Wheel Build 

1. The carbon layup: intermediate-modulus toughness, high-modulus stiffness where it counts

Intermediate-modulus carbon fibre is tough and impact-resistant. It handles the sections of a rim that take trail punishment without cracking. High-modulus fibre is stiffer and lighter, and is used where the layup prioritises stiffness and minimum weight over compliance. Using both means each part of the rim is built with the fibre grade that actually suits what that section of the rim has to do. At 340g, that is the result of engineering decisions, not a single-grade shortcut.

2. Hookless tubeless is how XC and trail riding actually works now

Inner tubes on a carbon rim make no sense in 2025. Hookless tubeless construction gives you a more consistent tyre interface, better pinch flat resistance, and the freedom to run the pressures your terrain actually demands rather than the pressures your fear of flats forces you towards. The 30mm internal width ensures your tyre assumes its correct cross-section, rounder, wider, more stable under load. That translates directly into grip you can feel and confidence that compounds through a long technical descent or a sketchy wet-roots section.

3. 28H or 32H: pick the build that matches your riding

A 28H build is lighter and well-matched to XC race use where the loads are controlled and low rotating weight is the priority. A 32H build spreads spoke tension across more points, increases lateral stiffness, and handles heavier riders and more aggressive terrain with greater reliability. Concept Speed offers both drillings. That is an acknowledgement that different riders need different wheels, and that giving you the choice is the right thing to do.

4. Published tension specs mean your wheel builder can do their best work

A carbon rim without published spoke tension limits is a rim that does not respect the people building with it. Maximum tension 150 kgf. Recommended range 110 to 130 kgf. ERD 592.5mm. These numbers are on the spec sheet and they are there because your wheel builder needs them to tension the wheel correctly, not conservatively, not by feel, but by the numbers the rim was engineered for. A properly tensioned wheel stays true. A guessed one does not. The Concept Speed Carbon Race Rim gives you the foundation for a build that performs season after season.

5. Warranty and crash replacement that treats carbon as an investment, not a consumable

A carbon rim at this price is an investment in your riding. The 5-year manufacturer warranty protects the structural integrity of that investment. The 3-year Crash Replacement Warranty means that if you put it into a rock face, you are not writing off the full cost, you get a replacement rim at 50% of the current retail price. Register within 30 days to unlock The Trust Guarantee, a full year of broad accidental damage protection without having to justify the claim. Bicycle Power Trading stands behind this rim. That matters when the trail disagrees with your line choice.