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This build pairs that fully revamped double-butted 4130 Chromoly Steel frame with a fully wireless SRAM AXS drivetrain. No cables. No housing. No indexing that drifts out over a season of dust and grit. Platform Highlights Fully Wireless SRAM AXS — Your choice of two drivetrains, both with Rival E1 carbon levers and hydraulic disc brakes. Battery and charger included. 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 — Required for the hangerless Full Mount derailleurs, and it means no hunting for proprietary hangers 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. With AXS there's far less to route in the first place. 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. Why wireless on a gravel bike Electronic shifting usually gets sold on speed. On a bike that lives in dust, mud, and grit, it's worth having for a duller reason: nothing about it degrades between services. Cable housing contaminates. Cables stretch. Indexing drifts. The shift you had in March isn't the shift you have in August. A wireless derailleur moves to a position it already knows, every time, regardless of what the bike has been through — and both of these derailleurs bolt through the frame with no hanger to bend and no limit screws to set. Build & Customize Choose Your Drivetrain — both are fully wireless SRAM AXS, with Rival E1 carbon levers and hydraulic disc brakes. SRAM Rival XPLR AXS Wireless 13-Speed · 10–46t Rival E1 carbon levers & hydraulic brakes Rival XPLR rear derailleur — hangerless Full Mount Rival 10–46t 13-speed cassette SRAM Flat-Top chain Rival XPLR (E-Gen) crank, 42t direct mount Battery & charger included Best for: long gravel days, endurance riding, and a tighter gear progression that keeps cadence steady on fast, rolling terrain. SRAM Eagle Transmission "Mullet" AXS Wireless 12-Speed · 10–52t Rival E1 carbon levers & hydraulic brakes S1000 T-Type rear derailleur — hangerless, no limit screws Eagle 10–52t cassette (XS-1270) — 520% range Eagle T-Type chain Rival XPLR (E-Gen) crank, 42t direct mount Battery & charger included Best for: big climbs, loaded bikepacking, MTB-width tire setups, and rowdy terrain where you want a bailout gear. Crank length is sized to frame: 165mm on XS / S / M, 170mm on L. 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 Cockpit & Brakes Gravel handlebar with 33° flare Rival E1 carbon levers with full hydraulic disc brakes 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 5'1" – 5'6" S 5'5" – 5'10" M 5'9" – 6'2" L 6'1" – 6'5" Assembly Options ?? Option 1: Pro-Build (Ready to Ride) — $79.99 Professionally assembled by our mechanics in Phoenix, Arizona ?? Safety-checked, test-fit, and re-packed for shipping Wireless drivetrain paired, calibrated, and firmware-updated before it ships Build queue: Please allow 1–2 weeks prior to shipping Read everything that's included ? Option 2: Skip Pro-Build (Ship Fast) Bike arrives completely unassembled (boxed parts) Professional assembly required before riding Want to get technical? Full Geo / Specs here .