HAUL ASS, NOT CARGO In 2019, spero took the gravel world by storm, heralding a new era of speed in gravel. Fun, but flat out. The new spero remains true to its original brief, but with some improvements: a threaded BB shell, neater cable routing, and a UDH-compatible derailleur hanger for those who want to use SRAMs Transmission drivetrains. And its more aero, of course. In the case of spero, aerodynamic performance is less about pure speed as a result of drag reduction, and more about conservation of energy. After a big day in a headwind, the three watts saved over the previous Aspero might add up to one less energy gel your stomach has to digestWORTH IT. In addition to the drag reduction, we also dropped the seat stays to give a bit more compliance out back, and reduced front-end stiffness slightly to make the last hours of a long race less painful. Between those dropped seat stays, we added in a bit more clearance for mud, too, taking what we learned from R5-CX (and the Unbound mudfest in 2023). Its a lot of seemingly small improvements, but they add up to a lot. The result is a bike that feels a lot like the original spero, but is faster, more comfortable, and more versatile. THREADED BOTTOM BRACKET Aspero uses the asymmetrical T47a threaded bottom bracket we pioneered on R5-CX. Its a simple, rider-serviceable interface that allows us to deliver the benefits of BBRight in a more user-friendly form. UNIVERSAL DERAILLEUR HANGAR We used SRAMs Universal Derailleur Hanger (UDH) standard on the new Aspero. Its ideal if you want to live your best business in the front, party in the back life with one of SRAMs Transmission drivetrains today, and ensures compatibility for future drivetrain developments. INTERNAL CABLE ROUTING Aspero shares the same bearing dimensions as R5, Soloist, R5-CX, and Caledonia, which means you can use any combination of bearing caps and stems. Want a super-racy, fully-internal look? Grab the ST31 and HB13 from R5. SPECIFICATIONS Fork: Cervlo All-Carbon, Tapered Aspero Fork Stem: Cervlo ST36 Alloy, w Cable Management Chain: SRAM Rival, 12 speed Tires: WTB Vulpine TCS Light Fast Rolling Dual DNA 60tpi 700x40c Brakes: SRAM Rival Rotors: SRAM Centerline Centerlock Saddle: Prologo Dimension STN Wheels: Front: Reserve 40, 25.5mm IW, Zipp 76, 24H, centerlock, tubeless compatible / Rear: Reserve 44, 25mm IW, Zipp 176,12x142mm, XDR freehub, 24H, centerlock, tubeless compatible Headset: FSA IS2 1-1/4 x 1-1/2 Crankset: SRAM Rival, 40T, DUB Wide Seatpost: Cervlo SP19 Carbon 27.2 Handlebars: Cervlo AB09 Carbon, 31.8mm clamp, 16 degree flare Bottom Bracket: SRAM DUB Wide, T47 BBright Rear Derailleur: SRAM Rival XPLR AXS, 12 speed Accessories & Extras: Smartpak 400A Top Tube Storage Bag Cassette/Freewheel: SRAM Rival XPLR, 10-44, 12 Speed Shifters: SRAM Rival AXS, 12-speed.