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.
BUILT-IN CHAIN TENSIONERS
Tapered, Sealed Bearing
Toray T700 Carbon Fiber
Carbon Fiber, Tapered
Aventon Aero, Carbon Fiber
|DROPOUT/ AXLE SPACING
100mm front, 120mm rear
Chassis (52cm frame, fork, headset, and seatpost) weighs 2,200 grams (4lbs, 13oz)
68mm, English Thread
1 boss, on down tube
Tapered, Sealed Bearing
|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|
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.
|Dimensions||39 × 8 × 23 in|