Concept Speed 29″ Carbon Race Ultra Light Rim – 28H

Concept Speed Carbon Ultralight Rim, 290g. Every Gram Counts.

You know the moment. The climb steepens, the gap opens, and everything that was manageable five minutes ago suddenly has to be earned. This is where rotating weight announces itself. At 290g per rim, the Concept Speed Carbon Ultralight Rim has almost nothing left to announce.

The rim is carbon, hookless, and tubeless only. Maximum pressure is 3 bar (44 psi). Recommended tyre width is 2.3 to 2.6 inches. The 30mm internal width keeps the tyre cross-section correct for XC race performance, rounded, well-supported, and grippy at the pressures that matter. 28H hole count, ERD 592.5mm, max spoke tension 150 kgf, recommended 110 to 130 kgf. A 100kg combined system weight limit (rider plus bike) applies. 

Five-year manufacturer warranty on the rim, 3-year Crash Replacement Warranty on the rim at 50% of the current retail price, The Trust Guarantee (register within 30 days of purchase at conceptspeed.co.za/register) on the rim.

Ultralight does not have to mean fragile. It has to mean fast. This rim is both.

 

Specifications: 

Weight	290g per rim
Wheel size	29″
Rim construction	Carbon, hookless tubeless-only
Internal width	30mm
External width	36mm
Rim depth	24mm
Hole count	28H
ERD	592.5mm
Max spoke tension	150 kgf
Rec. spoke tension	110–130 kgf
Max tyre pressure	3 bar (44 psi)
Recommended tyre	2.3–2.6″
System weight limit	100kg combined (rider plus bike)
Warranty	5-year manufacturer warranty on the rim
Crash replacement	3-year at 50% on the rim of current retail price
Trust Guarantee	1-year on the rim. Register within 30 days at conceptspeed.co.za

 

5 Reasons the Concept Speed Carbon Ultralight Rim Belongs on Your XC Race Build

1. 290g is where you feel the difference, on every climb, every acceleration

Rotational weight is not like frame weight. Frame weight moves in a straight line. Rotating weight has to spin up on every surge, off the start line, out of every corner, onto every short climb. Heavier rims demand more energy from your legs each time. At 290g, this rim reduces that demand. The result is a wheel that reacts the moment you push, with less resistance on the climbs where the race gets decided.

2. The carbon that makes 290g possible, and what that weight means on the trail

Getting a rim to 290g without compromising structural integrity requires a deliberate layup strategy. Intermediate-modulus carbon handles toughness and impact resistance. High-modulus carbon delivers the stiffness-to-weight ratio that gets the number down to 290g without reducing wall thickness where it matters. The material is not compromised. The engineering is not simplified. The pricing reflects a decision to build a product that riders can actually buy, not one that lives in a magazine review and out of reach of most race budgets.

3. Hookless tubeless at lower pressures gives you traction where it counts most

On a hookless tubeless rim, you run lower pressure. Lower pressure means the tyre deforms around obstacles instead of deflecting off them. Roots, rocks, and rough sections that cost you speed on a firmer setup become manageable at the pressures hookless tubeless allows. The 30mm internal width supports your race tyre in its correct shape, which means better cornering grip, more predictable handling under load, and less of that front-wheel push that loses you time and confidence on technical XC courses. Fear of flats does not dictate your pressure choices here.

4. A 28H XC race profile, lean, light, and built to work with quality components

28 spokes is the right number for this rim and this application. Lean enough to keep the build light, strong enough to handle the controlled loads of XC and marathon racing. Pair it with a quality lightweight hub and double butted spokes, tension it to the published spec of 110 to 130 kgf, and you have a custom race wheel that competes with options retailing at considerably more. ERD of 592.5mm makes spoke calculation straightforward. The numbers are published because they matter, and because Concept Speed wants you to build this wheel correctly.

5. Warranty and crash support: because fast should not mean precious

A 100kg combined system weight limit applies, rider plus bike. Riders within that envelope get 290g of precisely engineered carbon performance backed by a 5-year manufacturer warranty on the rim, 3-year Crash Replacement Warranty on the rim at 50% of the current retail price, and The Trust Guarantee on the rim (register within 30 days of purchase at conceptspeed.co.za/register). Bicycle Power Trading backs this rim. Race on it with confidence.

290g. Carbon. Hookless tubeless. The most direct route to a faster, more responsive XC race wheel. Start here.