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Ultro represents the pinnacle of design for track and fixed gear racing from Aventon. A pure-bred race machine for the velodrome or fixed gear crit scene. We chose to build it in carbon fiber for the best possible performance - lightweight, strong and stiff, with premium materials: Toray T700.
When we set out to build the Ultro, we went straight to the source - designer James Trimble. Trimble has been building carbon fiber bicycle frames since the early 90’s. Bikes run in the Trimble family (you may have heard of David, who started the Red Hook Crit, and Brent, founder of Kestrel Bikes.) Trimble designed performance and convenience features that represent the very best race bike we can produce. These include a tapered head tube for stiffness when you unleash your sprint, built-in chain tensioners for easy adjustments when changing gear ratios, and a massive, aero wing-shaped carbon fiber seatpost. The frame features an integrated, hidden aero seatpost binder for a super clean look.
In keeping with the racing ethos, Ultro is designed for brakeless riding on the velodrome and is not drilled for front or rear brakes. Ultro is offered as a frameset so that you can build it up just the way you like. The Ultro frameset package includes frame, fork, headset, and aero seatpost.
This is the carbon steed that represents the pinnacle of design for track and fixed gear racing. Being the most progressive bike we’ve ever created, we obsessed over it being as beautiful as it is fast. Disciplined on the boards of the velodrome, but a slayer on the asphalt, the Ultro is the ultimate racer experience.
When we developed the Ultro, we weren’t satisfied with another open-mold race bike. We went to James Trimble, the OG of aero track designs to curate this machine. After years of CFD modeling and design tweaks, the Ultro has been sculpted into slippery aerodynamic shapes, with a hidden seatpost clamp, and a winged seatpost, allowing you to unleash your fastest self.
Fitted with oversized tubing and a tapered steerer, the power delivery is precise and direct to the wheels. Railing through corners, the tubing ensures stiffness where you want it and comfort and support when you need it.
When we developed the Ultro, we weren’t satisfied with another open-mold race bike. We went to James Trimble, the OG of aero track designs to curate this machine. After years of CFD modeling and design tweaks, the Ultro has been sculpted into slippery aerodynamic shapes, with a hidden seatpost clamp, and a winged seatpost, allowing you to unleash your fastest self.
Fitted with oversized tubing and a tapered steerer, the power delivery is precise and direct to the wheels. Railing through corners, the tubing ensures stiffness where you want it and comfort and support when you need it.
Created for flexibility, the Ultro can quickly adapt to you and holds true to proven industry standards. With its english threaded bottom bracket and built-in chain tensioners, you can easily swap parts to suit whatever you throw at the Ultro. No fuss. Period.
The fit of your bike can make or break your riding experience and we want you to stay racing. Simply find your height and match your size.
XS
5'5" - 5'7"
S
5'7" - 5'9"
M
5'9" - 511"
L
5'11" - 6'1"
XL
6'1" - 6'3"
XS
5'5" - 5'7"
S
5'7" - 5'9"
M
5'9" - 511"
L
5'11" - 6'1"
XL
6'1" - 6'3"
| FRAME SIZE | X-Small (fits like 49cm) | Small (fits like 52cm) | Medium (fits like 55cm) | Large (fits like 58cm) | X-Large (fits like 61cm) |
| Height | 5'5" - 5'7" | 5'7" - 5'8" | 5'8" - 5'11" | 5'9" - 5'11" | 6'1" - 6'3" |
| A | Effective Top Tube Length^ | 515mm | 533mm | 545mm | 554mm | 561mm |
| B | Seat Tube Length C-T | 465mm | 490mm | 510mm | 530mm | 550mm |
| C | Standover Height | 749mm | 770mm | 789mm | 807mm | 825mm |
| D | Stack | 502mm | 523mm | 539mm | 558mm | 576mm |
| E | Reach | 385mm | 392mm | 395mm | 400mm | 404mm |
| F | Head Tube Angle | 72° | 72.5° | 73° | 73° | 73° |
| G | Seat Tube Angle | 75.5° | 75° | 74.5° | 74.5° | 73.5° |
| H | Fork Offset | 35mm | 35mm | 35mm | 35mm | 35mm |
| I | BB Drop | 56mm | 56mm | 56mm | 56mm | 56mm |
| J | Wheelbase* | 951mm | 961mm | 965mm | 976mm | 988mm |
| K | Chainstay | 388mm | 388mm | 390mm | 390mm | 393mm |
| L | Head Tube Length | 113mm | 133mm | 148mm | 168mm | 186mm |
Created for flexibility, the Ultro can quickly adapt to you and holds true to proven industry standards. With its english threaded bottom bracket and built-in chain tensioners, you can easily swap parts to suit whatever you throw at the Ultro. No fuss. Period.
Ultro includes beautifully engineered details that will make riding and owning it a pleasure. These include built-in chain tensioners, a metal head badge, hidden aero seatpost binder, and a design without mounting points for brakes, optimized for brakeless fixed gear riding. We've also used a standard English-threaded bottom bracket for easy installation and creak-free rides.
Ultro includes beautifully engineered details that will make riding and owning it a pleasure. These include built-in chain tensioners, a metal head badge, hidden aero seatpost binder, and a design without mounting points for brakes, optimized for brakeless fixed gear riding. We've also used a standard English-threaded bottom bracket for easy installation and creak-free rides.
Ultro is shipped and sold as a frameset, including frame, fork, headset, and seatpost. To get started riding, you’ll need to assemble it into a complete bike using compatible parts. Building a bike from a frameset requires advanced expertise and appropriate tools. Please consult a qualified expert for assembly help.
I never do reviews. I did this time because this frame is actually awesome, and for the price, I was expecting it to be good, but maybe not THIS good. Light, stiff, handles perfectly on the road, and the ride quality is great. This is the ultimate bike for fixie crits, perfect for roadies who like fixies, and can also hold its own on a velodrome.
The thing that sold me on this frame is silly. I'm a former collegiate road/cyclocross racer, and have always loved training on a fixed gear. And, as a former bike shop mechanic with a sweet employee discount, I've had a million of them - Specialized, Cannondale, Cinelli, vintage steel track bikes, list goes on. But hardly anyone puts WATER BOTTLE CAGE MOUNTS on their track frames, so if you want to train on the road with your track bike, you're usually stuck with one of those awkward saddle-mounted bottle carriers. So, yeah, I literally replaced my Cinelli Vigorelli frame with the Ultro solely because it had bottle cage mounts (and it looks cool) - but wasn't really expecting a big difference in performance.
But when I got the Ultro and built it up, it was evident this was on a completely different level. The stiffness, handling, and overall design are on par with frames costing 2-3x as much. The attention to detail is fantastic - the little things like the intelligently designed chain tensioners, the subtle decals on the inside of the chainstays say "dreamt in California" - it's evident that Aventon put an enormous amount of thought and effort into making this frame awesome.
I love it. Great job!
I brought the frame replaced to fork so I could have a front brake and it’s the best bike I have ever owned
This bike is amazing! Rides well and gets a lot of attention on the streets.
Aventon Ultro Complete DIY Bike Kit
Aventon Ultro Complete DIY Bike Kit
