Threshold Cycling | Summit SL42 Carbon Road Wheelset | Industry Nine 1/1 & Sapim CX-Ray

The Unfair Advantage on Climbs Meet the Summit SL42, a sub-1,350g pure climbing weapon engineered to strip rotational weight, defy gravity, and leave the peloton behind. Handbuilt for the uncompromising cyclist, we bypassed the heavy factory markups to pair the world’s most trusted premium components into one ridiculously fast, lightweight package. Whether you're hunting local KOMs or surviving all-day mountain epics, the Summit SL42 delivers explosive acceleration and razor-sharp handling without sacrificing everyday durability. We started with a blank-canvas, high-modulus carbon rim optimized for climbing. At 42mm deep, it offers a noticeable aerodynamic advantage on the flats and descents while remaining stable in crosswinds. Modern 25mm Internal / 32mm External Width: Perfectly optimized for modern 28c-32c tires. This wide stance creates a flush, aerodynamic profile while allowing you to drop tire pressures for unmatched grip, vibration damping, and rolling efficiency. Hooked Rim Profile: Maximum versatility and safety. Compatible with both tubeless tires and standard clinchers with inner tubes—with zero hookless tire restrictions or 73 PSI pressure limits. Stealth Gloss Finish: A pristine, no-decals gloss clear coat that drops jaws and wipes clean effortlessly after gritty rides. The Heart: Industry Nine 1/1 Hubs Built around the legendary performance heritage of Industry Nine 1/1 Road Hubs. Machined in Asheville, North Carolina, these hubs take a no-nonsense approach to precision, remaining confident and capable of cleaning the A-line while leaving budget for a season of bucket list rides. They feature a robust dual phased-pawl drive mechanism utilizing a six-pawl driver and a 45-tooth drive ring. This accomplishes a blistering 90 points of engagement (4° engagement). The moment you put power to the pedals on a steep pitch, the transfer is instantaneous. The Muscle: Sapim CX-Ray Spokes & Secure Lock Nipples Laced with the undisputed king of spokes: the Sapim CX-Ray. Forged from high-tensile steel into an aerodynamic blade, the CX-Ray offers the weight of a titanium spoke with a legendary fatigue life that outlasts standard round spokes by millions of cycles. We anchor them with Sapim Polyax Locking Alloy Nipples to shave every possible gram from the outer edge of the wheel while ensuring your tension stays perfectly true, season after season. Free, fully insured shipping included. Official 2-Year Limited Warranty & Crash Protection Every Summit SL42 wheelset is engineered and assembled for uncompromising reliability. We back every wheelset with a comprehensive two-tier protection policy for the original owner: 2-Year Limited Manufacturer Warranty: Full coverage against defects in materials and craftsmanship for two (2) full years from the date of purchase. Because we build with authentic Industry Nine 1/1 hubs and Sapim spokes, your wheels are backed by genuine manufacturer component coverage and direct US customer support. Subsidized Crash Replacement Support: We know real-world cycling happens. If your rim suffers damage in a crash, race incident, or severe road hazard, we provide an at-cost crash replacement program with discounted factory rebuild service to get you back rolling without paying retail price. Technical Specifications Intended Use Road Racing, Steep Climbing, Fast Endurance & Gran Fondo Rim Material & Profile High-Modulus Superlight Carbon Fiber — Hooked (Crochet) Clincher & Tubeless Ready Aerodynamic Dimensions 42mm Depth | 25mm Internal Width | 32mm External Width (Optimized for 28c–32c Tires) Hubs & Engagement Industry Nine 1/1 Road Disc (Machined in Asheville, NC) — 90 POE / 4° Engagement Spokes & Nipples Sapim CX-Ray Bladed Aero Spokes (24F / 24R) + Sapim Polyax 14G Locking Alloy Nipples Brake & Axle Standard Centerlock Disc Brake | 12x100mm Front / 12x142mm Rear Thru-Axle | Shimano HG 11/12s Verified Weight ~1,350g Bare Wheelset (1,394g Verified on Scale with Pre-Installed Silca Tape & CNC Valves) Rider Weight Limit 250 lbs (113 kg) Warranty & Protection 2-Year Craftsmanship Warranty + Subsidized Crash Replacement Program