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A fully revamped double-butted 4130 Chromoly Steel frame with UDH compatibility, dropper-post readiness, semi-internal cable routing, and mounts for bottles, racks, fenders, and accessories gives you a platform that can be set up for almost anything. Platform Highlights Double-Butted 4130 Chromoly Steel Frame — Thicker tube walls at the ends where they're welded and stress concentrates, thinner through the middle where they don't need to be. Strength where it matters, weight shed everywhere else. Tough, repairable, and with a ride quality that carbon can't replicate. Built for the long haul. UDH-Compatible — Universal Derailleur Hanger means no hunting for proprietary parts anywhere in the world. Dropper Post Ready — Internal routing already in place. Add a dropper whenever you're ready. Semi-Internal Cable Routing — Cleaner than fully external, easier to service than fully internal. Tire Clearance — Plenty of room for real-world rubber in any configuration: Frame & Standard Fork: 700c x 55mm (2.2") or 650b x 60mm (2.4") Frame & Monster Fork (Carbon): 700c x 55mm (2.2") or 650b x 55mm (2.2") Mounts for Everything — 3 water bottle mounts plus rack, fender, and accessory mounts. Pack it up or strip it down. Build & Customize Choose Your Wheel Size — same frame, same clearance, two genuinely different bikes. Included 700c — Fast & Versatile 23mm tubeless-capable rims (tape, valves, and sealant required) Continental Terra Hardpack TR 50mm Best for: gravel racing, mixed-surface riding, fast days out Included 650b — Capable & Comfortable 25mm tubeless-capable rims (tape, valves, and sealant required) Vittoria Barzo 2.1" knobby tires More volume, more grip, more trail capability Best for: bikepacking, rough terrain, off-road days ?? Want both? Add the dual wheelset option — wheels, tires, tubes, rotors, and cassette — for $299.99 . Swap between setups in minutes. The 700c tire: one of the fastest-rolling 50mm gravel tires you can buy. The Continental Terra Hardpack TR 50 scored 18.6 watts rolling resistance in independent lab testing at BicycleRollingResistance.com — earning a 4.5/5 "Highly Recommended" rating and putting it among the fastest gravel tires at this width. A flat central tread keeps things quick on pavement and hard-pack, while developed shoulder lugs and Continental's ShieldWall puncture protection handle the rough stuff. PureGrip compound means grip and durability don't get traded off against each other. At 50mm, this tire smooths out terrain that would rattle a narrower setup — without giving up speed. Choose Your Wheelset Upgrade Upgrade DT Swiss G1800 Spline Available in 650b or 700c, tubeless DT Swiss 370 hubs — the ratchet system this brand built its name on Aluminum rim, tubeless ready and pre-taped out of the box Proven, race-tested durability for riders who put in real mileage +$450.00 See full specs ? Top Pick Zipp 303 XPLR S 700c only. UD carbon, hookless, tubeless 32mm internal / 54mm rim depth Built around the gravel tire first, not a repurposed road rim — lets you run lower pressure without the tire squirming in corners Wide, deep profile designed to cut real aero drag at gravel race speeds +$1,000.00 (MSRP $1,500.00 - save $500) See full specs ? SRAM engineered the 303 XPLR platform around the gravel tire first — wide, deep, and hookless — instead of just widening a road rim. The result: lower tire pressure without the squirm, more cornering grip, and real aero gains once you're moving at gravel race speed. — As tested by BikeRadar & Cyclingnews ?? The Zipp 303 XPLR S uses hookless rims: tubeless tires only, 50 psi maximum, and approved tires only . The stock Continental Terra Hardpack TR 50mm falls within the rim's 40–61c range. Check Zipp's current approved hookless tire list before fitting anything else. Choose Your Fork Upgrade — every build ships with the matched 4130 chromoly steel fork. These are the ways to change it. Upgrade Carbon "Black Label" Gravel Fork Full carbon — a significant weight savings over steel, right where you feel it most Light, stiff, and tuned to the frame's all-road geometry Mounts for cages and cargo +$249.99 See full specs ? Upgrade Carbon Monster Fork v2 Saves over 1.25 lbs vs the steel fork Geometry-altering flip-chip for fit adjustment Maximum tire clearance, improved comfort and front-end stiffness +$299.99 See full specs ? Upgrade All-Road Suspension Fork (40mm) 40mm travel — takes the edge off rough terrain Noticeably smoother on chunky gravel and trails The pick if your gravel is closer to hardtail territory +$350.00 ($450 value - save $100) See full specs ? Complete Component Spec Frame Double-butted 4130 Chromoly Steel with Thru-Axle Dropouts (142mm rear spacing) UDH-Compatible derailleur hanger Semi-Internal Cable Routing Dropper Post Ready Mounts for 3 water bottles, racks, fenders, and accessories Fork 4130 Chromoly Steel, matched to the frame — 12x100mm thru-axle, rack and accessory mounts Drivetrain 12-Speed State Bicycle Co. drivetrain Crank: 40t Direct Mount Chainring Cassette: 11–46t (upgrade to 11–50t available for $69.99) Cockpit & Brakes Gravel handlebar with 33° flare Cable-Actuated Hydraulic Disc Brakes with compressionless housing Rims 700c: 23mm tubeless-capable (tape, valves, and sealant required) 650b: 25mm tubeless-capable (tape, valves, and sealant required) Tires 700c: Continental Terra Hardpack TR 50mm — tubeless ready 650b: Vittoria Barzo 2.1" — not tubeless rated ?? Please note: the Vittoria Barzo tires (650b) are not rated tubeless. While it may be possible to set these up tubeless, we cannot guarantee compatibility. State Bicycle Co. recommends professional assembly for tubeless setups. Size Recommendations Size Height Range XS (43cm) 5'1" – 5'6" S (47cm) 5'5" – 5'10" M (51cm) 5'9" – 6'2" L (55cm) 6'1" – 6'5" Looking for wireless shifting? The same frame is available with fully wireless SRAM AXS drivetrains — no cables to route, nothing to re-index, and a hangerless derailleur bolted straight through the frame. See the full 4130 All-Road range ? Want to get technical? Full Geo / Specs here .