Cervelo Aspero GRX Di2 Disc Bicycle 2021
The Aspero GRX 815 Di2 features the famed precision and reliability of the electronic shifting system. As a 2x drivetrain, it delivers range, confidence, speed and balance needed in a gravel race bike. GRX 800 series components have been developed to handle the abuse and harsh conditions of true gravel riding, yet function with the consistent precision and efficiency of Ultegra Di2. Fast, capable, fun, and more like a road bike than any gravel option we have seen to date, the Aspero will surely deliver for those who love to go out and rip it up. With Aspero, Cervelo has designed a frameset that deliver a gravel riding experience road cyclists will embrace.
Inspiration from the Aspero frame construction and features has come from several Cervelo models, yet the design has been engineered from the frame up for the race gravel concept for which it was conceived. Aero inspiration has always a driving force for Cervelo, and the toptube shares the shape and a hidden 2-bolt SmartPak bag mount of the P5 that is compatible with several aero and storage bags available today. The internal reference design points exemplify elements of Cervelo's best engineering to date, and all serve the gravel race concept: fit, speed, balance, handling, and set-up flexibility.
That said, it is the engineering behind the frame geometry, fork design, an adjustable trail set-up, and overall frame stability that define the Aspero. One major goal was to provide the clearance necessary for 650b x 51mm tires, or 700c x 43mm tires with at least 4mm on either side to spare. This was accomplished in a few key ways. Up front the fork legs have a new carbon lay-up and shaping from the large 12mm thru-axle dropout on up, with an integrated crown that isn't as vertically thick as you'd expect, yet still inherently strong and gravel ready with great rounded tire clearance. Cervelo also was able to maintain a balanced front-center measurement by elongating the top tube, maintaining a road-oriented seattube angle, and proper trail via an adjustable front dropout design. The center of gravity (COG) is moved rearwards, as the headtube angles are more gravel/cyclocross than road. The 56cm toptube of the Aspero is 9mm longer than the 56cm R3. The headtube itself was kept essentially at R3 road lengths per size, which along with the impressive fork design and integrated headset means that the forward cockpit position feels more like a road bike- your saddle drop to bar can be more like your road fit. At the rear triangle a 420mm chainstay length was achieved with a dropped chainstay design and a seat-tube cut-out.
The engineers were particularly focused on making sure the Aspero handled properly. The concept of fork "Trail" is best known in the mountain bike world, but is relevant across all cycling. Cervelo is using what they call their Trail Mixer system to allow the rider to keep effective Trail at 62mm. Larger variations in tire size effect the rearward position of the tire- affecting handling and toe-overlap clearance. By using off center, bolt-in 12mm thru-axle drop outs, the rider can select the +5 forward position or the -5 rear position of the axle. With a 700x42 gravel tire set-up, similar to the stock Aspero GRX Disc bike, the +5mm forward is the proper position for best active handling and nimble bike control. If you moved it to the -5mm rearward position, it would slow the handling down, perhaps better for long, flat rides on firmer, smoother, less technical surfaces. The principles of Trail set-up come down to the outside diameter of a mounted tire and desired handling characteristics to determine your Trail Mixer set-up. Cervelo has a more complete explanation of the mechanically simple Trail Mixer system on their website.
The use of the modified Squoval.Max tubeset is clear with the Aspero featuring a substantially larger downtube and massive bottom bracket junction over the R3. The integrated fork crown and downtube design resembles the Dropped Downtube of the aero bikes but it seems more functional for strength and visual balance from the tapered headtube through the downtube. The seattube features a squared back, cut-out design, but carries a 27.2mm round seatpost, which can provide more vertical compliance and offers more options. Everything, from the dropped, oversized chainstays, slightly curved, shaped aero seatstays, rear dropouts and Flat Mount disc interface are all stouter for increased strength and torsional stiffness. A modified Future Proof cable guide and internal routing system has an option for a cabled or hydraulic dropper seatpost, and a bolt-on downtube protector handles the debris coming off the front wheel.
The Aspero GRX 815 Di2 Disc Bike features a 2x11 GRX drivetrain and GRX hydraulic disc brakes. The 700c, 32mm deep Reserve Tubeless Ready Wheelset features DT350 CL hubs, and a 24mm internal width, is strong, fast and ideal for wider tires. The highly regarded Panaracer Gravel King SK Folding 700x38 tires tires keep you in control on the ground, while the carbon Easton cockpit and Prologo saddle build out your riding position.
- Wonderfully capable carbon gravel race bike w/ 11s 2x Shimano GRX 815 Di2 , Easton
- Lower, more stable road-like feel from overall geometry, chainstay length, BB drop
- Longer toptube moves COG back; low forward position; 62mm optimal Trail
- Accepts 700c x 43mm tires / 650b x 51mm tires; minimum 4mm side clearance
- Trail Mixer fork dropouts can be switched for +/- 5mm selectable fork offset
- Basic Rule (For 700c): Small(OD)= -5, Big(OD)= +5
- Forward position=decreased trail=faster handling
- Rearward position=increased trail=slower handling
- Squoval.Max inspired tube designs, enlarged and enhanced for rough surfaces
- Full carbon tapered fork designed for Aspero, with thru-axle, Flat Mount disc
- Fork features aero integration to downtube with larger, stouter crown design
- Large downtube BBright shell transition deftly into oversized dropped chainstays
- Carbon lay-up, stay design, round seatpost, larger volume tires contribute to rider comfort
- Internal routing, downtube hose guide; option for cabled/hydraulic dropper post
- Frameset 1x/2x compatible, with mechanical or electronic shifting systems
- Bolt-on downtube frame protector; 2-bolt toptube bag mount
- Cervelo Indexed Thru-Axles w/ Lever: 12/100mm fork, 12/142mm rear
- Shimano 11spd GRX Di2 815 Dual Control Levers, FD, RD
- Di2 e-Tube internal wiring, seatpost battery
- GRX 810 Crankset 48/31T w/ Cervelo Y-BB 24 bottom bracket
- HG800 11-34 cassette, CN701 chain, RT800 CL 160mm disc rotors
- Reserve 32 Wheelset [DT350, 24h 2xF/R] Center-Lock, Tubeless Ready, with 24mm IRW
- Panaracer Gravel King SK Folding 700x38 tires
- Easton cockpit: Easton EC70AX Carbon handlebar, EA90 Alloy stem, EC70 Carbon 27.2 seatpost
- Prologo Dimension NDR T4.0 Saddle
- Component specifics by frame size
- 48cm Bar width: 38c-c, Stem length: 70mm, Crank length: 165mm
- 51cm Bar width: 40c-c, Stem length: 80mm, Crank length: 170mm
- 54cm/56cm Bar width: 42c-c, Stem length: 90mm, Crank length: 172.5mm
- 58cm/61cm Bar width: 44-c-c, Stem length: 100mm, Crank length: 175mm
- Sizes: 51, 54, 56, 58cm (51, 54 have Zero offset seatpost)
- Color: Black / Gold, Seabreeze Blue
- Weight: 18.36 (54cm actual)
|Top Tube Length||512mm||532mm||553mm||575mm||591mm||608mm|
|Head Tube Length||83mm||107mm||133mm||159mm||188mm||314mm|
|Bottom Bracket Drop||78.5mm||78.5mm||76mm||76mm||73.5mm||73.5mm|