Aventon Ultro



Out of stock


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.

  • Full Toray T700 carbon fiber
  • Kit includes frame, fork, headset, and seatpost
  • Tapered head tube
  • Built-in chain tensioners


  • Includes Frame, Fork, Seatpost, and Headset


  • Easily Control Chain Tension


  • Stiffness and Control


  • Wing-Shaped Aerodynamic Post

Tapered, Sealed Bearing

Toray T700 Carbon Fiber
Carbon Fiber, Tapered
Aventon Aero, Carbon Fiber
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

Aventon Ultro Sizing Chart
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.

Additional information
Weight 5 lbs
Dimensions 39 × 8 × 23 in