Light Bicycle has released its lightest triathlon disc wheel yet with the Falcon Pro C25, weighing under 800g—a record that positions it as the lightest TT/Tri solid disc wheel publicly available as of 2026. The achievement came through hollow carbon construction techniques that maintain structural integrity while reducing mass to levels previously thought impractical for disc wheels. This isn’t incremental progress; it’s a meaningful jump in the weight-conscious triathlon market where manufacturers have typically settled for disc wheels in the 950g to 1,100g range.
For triathletes who measure performance in watts saved and seconds gained, the Falcon Pro C25 offers a tangible advantage. A complete AER180 rear-only wheel, designed for windy conditions, tips the scale at 1,126g—still competitive but illustrating the spectrum Light Bicycle now spans. At $872 for the AER180, the price point remains aggressive, though buyers should understand what they’re paying for: experimental lightweight construction that trades some durability conventions for speed.
Table of Contents
- How did Light Bicycle achieve such extreme weight reduction in triathlon disc wheels?
- Falcon Pro C25 rim specifications and aerodynamic design
- AER180 versus Falcon Pro C25—which wheel solves your triathlon needs?
- Real-world triathlon impact—where weight savings translate to time savings
- Durability and maintenance concerns with hollow carbon construction
- Pricing strategy and value comparison
- Hub and spoke architecture in Light Bicycle’s record-breaking wheels
How did Light Bicycle achieve such extreme weight reduction in triathlon disc wheels?
Hollow carbon construction forms the backbone of Light bicycle‘s weight strategy. Rather than building up solid carbon layers and accepting the resulting mass, the company engineered a spoke pattern and rim structure that removes material without compromising lateral stiffness or braking surface integrity. The Falcon Pro C25’s 25mm internal rim depth uses this hollow design philosophy throughout, creating a wheel that feels paradoxically strong despite its featherweight character.
This engineering approach differs markedly from traditional disc wheel design, where manufacturers added material to resist the torque and stress loads that solid wheels face. By hollow construction, Light Bicycle essentially creates a shell structure similar to aerospace applications—the rim walls remain thick enough to handle braking forces and impact, but the interior volume is largely empty. The downside: inspection and maintenance become more critical. Any impact damage to the rim’s exterior creates a repair dilemma; patching carbon that’s designed with hollow cavities is not straightforward.
Falcon Pro C25 rim specifications and aerodynamic design
The Falcon Pro C25 features a 25mm internal rim depth with approximately 32mm external width—a relatively conservative aero profile compared to 180mm deep rims. This design targets compatibility and crosswind stability over maximum aerodynamic gain. Triathletes in moderate-wind conditions will find the shallow depth delivers steady handling without requiring the constant micro-corrections needed for deeper rims in gusty environments.
The rim’s hooked bead and tubeless-ready construction accommodate modern tire widths between 25mm and 30mm. This compatibility matters practically: you can experiment with tire choice—a 28mm tubeless tire paired with this rim creates a supple ride quality that many lighter disc wheels sacrifice. However, the tubeless-ready design assumes you’ll commit to a tubeless setup; the rim’s margin for error with tube compatibility is narrow, and tire seating can be finicky on narrower internal widths if you switch back to traditional tubes.
AER180 versus Falcon Pro C25—which wheel solves your triathlon needs?
The AER180 represents Light Bicycle’s answer to riders prioritizing crosswind performance alongside lightweight construction. At 1,126g complete, it weighs 300+ grams more than the Falcon Pro C25, a difference riders will feel immediately when accelerating out of transitions or climbing any rolling terrain. The ultra-deep rim cuts through wind effectively, especially on courses known for lateral gusts. For an Ironman professional racing a windy coastal course, the AER180’s aerodynamic advantage likely outweighs its mass penalty.
The Falcon Pro C25 serves different conditions—flat, sheltered courses where aero benefit plateaus and weight becomes the limiting factor. On a calm day at sea level, a lighter wheel’s rotating mass advantage compounds across 40 kilometers of bike riding. The practical trade-off: Falcon Pro C25 owners sacrifice some aero margin to gain acceleration and the psychological boost of a sub-800g disc wheel. Both wheels use Light Bicycle’s hollow carbon technology, so the fundamental engineering philosophy is identical; the difference is priority and rim geometry.
Real-world triathlon impact—where weight savings translate to time savings
A 300g difference between the Falcon Pro C25 and AER180 translates to roughly 1-2 watts saved during steady-state efforts on flat terrain, assuming identical rider fitness and power output. Over a 40km bike leg, this compounds to meaningful time savings—potentially 90 seconds to three minutes depending on aerobic efficiency and terrain. For age-group triathletes where races are won or lost by narrower margins, shaving weight from rotating components creates measurable advantage without requiring fitness gains.
The limitation appears immediately in wind. A shallow-rimmed wheel like the Falcon Pro C25 can drift laterally 5-10cm more than a 180mm deep rim in 20-knot crosswinds. For riders unfamiliar with light, responsive handling characteristics, the wheel’s behavior in gusts requires adaptation—it’s not dangerous, but it demands active steering. Triathletes transitioning from heavier disc wheels often misjudge the Falcon Pro C25’s responsiveness and overcompensate, creating unnecessary fatigue and delayed wattage.
Durability and maintenance concerns with hollow carbon construction
Hollow carbon rims demand inspection protocols that traditional disc wheels don’t require. Small cracks in the outer carbon surface can expand into the hollow cavity, creating structural failure modes that aren’t visible without close visual examination. Light Bicycle wheels should be inspected after crashes, hard landings from potholes, or any impact—not because they’re inherently fragile, but because damage assessment is harder. A solid carbon rim with a hairline crack remains functional; a hollow rim with the same crack might progressively delaminate.
Brake surface wear also requires monitoring. Hollow construction doesn’t leave unlimited material for brake pad wear—the braking surface has finite depth. Extended hard braking—downhill sections, track days, or multiple races without cleaning pads—can accelerate wear. Light Bicycle’s official guidance recommends replacing or truing rims once brake surface wear reaches specific thresholds; ignoring this guidance can result in rim failure mid-race. This is not hypothetical: hollow carbon rims operated past their brake wear limits have failed catastrophically.
Pricing strategy and value comparison
The AER180 retails at $872, placing it at the premium tier of triathlon disc wheels. For comparison, Light Bicycle’s PrecisionX C22d alternative weighs 950g—150 grams heavier than the AER180—and typically costs less. The 150-gram difference is meaningful but requires weighing against the AER180’s actual aero advantages on your specific race course.
Casual triathletes may find the price-to-performance ratio tilts toward alternatives; professionals preparing for nationals or international events more clearly justify the expense. Factor in wheelset costs comprehensively: the disc wheel price alone doesn’t capture hub options, spoke count variability, and custom builds. Light Bicycle offers different hub options with varying weight and drag characteristics, and spoke counts from 20 to 32, each affecting final weight and ride quality. A complete Falcon Pro C25 wheelset—front and rear paired—exceeds $1,500 easily, putting it in rarefied company of Italian and Swiss boutique manufacturers.
Hub and spoke architecture in Light Bicycle’s record-breaking wheels
Light Bicycle offers both standard and lightweight hub options for the Falcon Pro C25 and AER180. Heavier hubs (ceramic or traditional steel bearings) provide durability and serviceability; lighter hubs reduce rotating mass but demand more fastidious maintenance. The spoke count decision carries practical consequences: 20-spoke builds minimize weight and drag but reduce load distribution per spoke, increasing puncture risk and tension sensitivity during hard acceleration.
Thirty-two spoke builds add 80-120 grams but provide margin for error on rough roads and better handle sudden power surges. For triathletes, 24-spoke configurations often represent the practical sweet spot—light enough to preserve the disc wheel’s weight advantage, robust enough to survive potholes and aggressive racing. Light Bicycle’s engineers tuned spoke patterns to account for the hollow rim’s lower torsional rigidity compared to solid designs; mismatched spoke tension creates handling issues that cascade into confidence erosion during racing. Building or purchasing these wheels from experienced mechanics, rather than direct customer builds, remains the safer approach despite higher labor costs.
