Aventon Ultro Complete DIY Bike Kit

Size

Everything you need to start racing

You've just gotta build it

Ultro Carbon Fiber Frame

Aventon Push Groupset

Aventon Push Wheelset

The Ultro DIY kit comes with everything you need for a complete bike build. It's ready for you to build from the ground up, starting from a bare frameset and parts. The kit includes a frame and fork, plus the parts needed to build an Ultro complete bike. The Aventon Ultro DIY Kit Bike is a great way to get a killer deal.


Fit and assembly notes:
* Fork included may need to be cut according to size. If you do not know how to cut a fork, please seek the advice of your local bike professional. Installing some bicycle parts (like a bottom bracket) requires specialty tools, which are not included in this bundle.

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.

Ultro Complete DIY Bike Kit

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.

Aerodynamic Design

Extraordinary Capability

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.

FRAMESET
AERO SEATPOST
TAPERED HEADTUBE

BUILT-IN CHAIN TENSIONERS

Stiffness & Control

The Power to Harness

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.

Aerodynamic Design

Extraordinary Capability

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.

FRAMESET

AERO SEATPOST

TAPERED HEADTUBE

BUILT-IN CHAIN TENSIONERS

Stiffness & Control

The Power to Harness

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.

Simple & Effective

Built-in Flexibility

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.

Find My Size

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"

Full Geometry Chart

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

Specifications

Frame

Contact Points

Seatpost

Aventon Aero Carbon Fiber
 

Bottle Bosses

1 Boss, on Down Tube
 

Dropout Spacing

100mm front, 120mm rear
 

Headset

Tapered, Sealed Bearing
 

Max Tire Size

700x28"
 

Frame

Frame

Toray T700 Carbon Fiber
 

Fork

Carbon Fiber, Tapered
 
Weight
4lbs, 13oz / 2,200g

Drivetrain

Bottom Bracket

68mm, English thread

WheelSet

Rim
30mm Depth
Anodized Black Machined Deep V 30mm Rim
 
HUB
Flip-Flop Rear Hub 16T Freewheel & 15T Fixed COG
 
Weight (F)
950g (Wheel Only)
 
Weight (B)
1050g (Wheel Only)
 
Spokes
Stainless Steel Spokes
 
count
28F / 28R
 
Tire compatibility
28c Max
 
Total weight (F)
1451.5g (W/ Tire and Tube)
 
Total weight (R)
1587.57g (W/ Tire, Tube, Lockring, and Cog)
tires
Kenda K1018 Kriterium
 
thread pitch(F)
9.0 x 26
 
thread pitch(R)
10 x 1mm
 
 

Groupset

handle bar
31.8mm*40cm Aventon Push Drop Bar
Weight: 396 grams
 
stem
Aventon Push 3D Forged Alloy, 4-Bolt, +/- 7º
Weight: 56 grams
 
BAR TAPE
Velo Microfiber Leather Tape
Weight: 56 grams
 
Pedals
Alloy Road Pedals
Weight: 283 grams
 
HEADSET
3 Piece Spacers 28.6*10mm
Weight: 56 grams
 
crankset
Aventon Push Forged Alloy 48T*170mm BCD 144mm
Weight: 850 grams
 
chain
KMC Z410
Weight: 226 grams
 
bottom bracket
VP Sealed Bearing 68*103mm
Weight: 196 grams
 
 
saddle
Aventon Push Aero Race Saddle
Weight: 226 grams
 
seatpost
Aventon Push 27.2*300mm 3D Forged Aluminum Alloy
Weight: 226 grams
 
brakes
Front Tektro Brakeset
Weight: 283 grams

Simple & Effective

Built-in Flexibility

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.

Killer Details

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.

Killer Details

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.

How to Build & Manuals

 

Brakes are included, but can't be used on Ultro, set them aside; a round seatpost is included but isn't needed because Ultro includes an aero carbon post, set the round seatpost aside. The Push wheelset included with this kit includes a flip-flop hub with a fixed cog on one side and a freewheel on the other. You can use the freewheel side of this wheelset on other bikes that have brakes installed, but you should never use the freewheel side on the Ultro, because Ultro does not have brakes. Use only the fixed cog side of the wheelset on Ultro.

Quick Start Guide (PDF)

Customer Reviews

Based on 25 reviews
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L.C.
Incredible
A
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Amazing bike
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Aventon Ultro Complete DIY Bike Kit