Road bikes are designed to go fast on the pavement. With less effort needed to move, you can ride farther and climb faster. The Argon 18 SUM Pro Ultegra Di2 Bike is a race-ready machine that will give you an aerodynamic advantage everywhere you ride. The SUM Pro features our most advanced layup and technologies to get you to the front of the group and keep you there, through the climbs, the corners, and the sprints. The carbon fiber frame and fork have clearance for up to 30c tires. The SUM Pro features internal cable routing, water bottle cage mounts, and draft-deflecting fork blades.
The Ultegra Di2 version of the Argon 18 SUM Pro comes with a Shimano Ultegra Di2 electronic drivetrain. With a 52/36T chainring combo up front and a 11-30T cassette on the rear, you'll be able to sprint, climb, and cruise at top speeds. Shimano Ultegra hydraulic disc brakes provide exceptional stopping power so you can slow down and stop under control. Zipp 303 S wheels are paired with Vittoria Corsa Cotton TLR tires that roll efficiently. With the Argon 18 SUM carbon seatpost, you'll have a smoother ride with fewer vibrations.
| Frame | Carbon Fiber |
|---|---|
| Fork | Carbon Fiber |
| Headset | FSA ACR NO.55R 1.5'' + 3D |
| Shifters | Shimano Ultegra Di2 R8170, 2x12-Speed |
| Front Derailleur | Shimano Ultegra Di2 R8150 |
| Rear Derailleur | Shimano Ultegra Di2 R8150 |
| Crankset | Ultegra R8100 |
| Bottom Bracket | Shimano SM-BB72 |
| Chain | Shimano Ultegra CN-M8100 12-Speed |
| Cassette | Shimano Ultegra CS-R8100, 11-30T |
| Brakes | Shimano Ultegra Di2 R8170, Ultegra RT-CL800 160/140mm |
| Wheelset | Zipp 303 S |
| Tires | Vittoria Corsa Cotton TLR 700x28mm |
| Handlebar | FSA SL-K Compact |
| Stem | FSA ACR ST-OS-160 |
| Grips/Bar Tape | Ciclovation Leather Touch Tornado Gloss |
| Seatpost | Argon 18 SUM Specific |
| Seatclamp | Bolt-Type |
| Saddle | Repente Prime |
| Intended Use | Road |
Note: Components are subject to change without notice.
| Size | XX-Small | Extra Small | Small | Medium | Large | Extra Large |
|---|---|---|---|---|---|---|
| A: Seat Tube Length | 395 | 425 | 460 | 505 | 550 | 595 |
| B: Effective Top Tube | 503 | 520 | 538 | 557 | 578 | 600 |
| C: Stack | 471 | 493 | 516 | 540 | 565 | 592 |
| D: Reach | 375 | 382 | 389 | 397 | 405 | 414 |
| E: BB Height | - | - | - | - | - | - |
| F: BB Drop | 69 | 73 | 77 | 77 | 77 | 77 |
| G: Head Tube Length | 69 | 85 | 101 | 126 | 152 | 180 |
| H: Head Tube Angle | 71.2 ° | 72.1 ° | 72.7 ° | 72.7 ° | 72.7 ° | 73 ° |
| I: Seat Tube Angle | 75 ° | 74.5 ° | 74 ° | 73.5 ° | 73 ° | 72.5 ° |
| J: Standover Height | 675 | 700 | 727 | 766 | 804 | 841 |
| K: Chainstay Length | 410 | 410 | 410 | 410 | 410 | 410 |
| L: Wheelbase | 967 | 972 | 975 | 990 | 1006 | 1020 |
| Size | XX-Small | Extra Small | Small | Medium | Large | Extra Large |
|---|---|---|---|---|---|---|
| A: Seat Tube Length | 15.6 | 16.7 | 18.1 | 19.9 | 21.7 | 23.4 |
| B: Effective Top Tube | 19.8 | 20.5 | 21.2 | 21.9 | 22.8 | 23.6 |
| C: Stack | 18.5 | 19.4 | 20.3 | 21.3 | 22.2 | 23.3 |
| D: Reach | 14.8 | 15.0 | 15.3 | 15.6 | 15.9 | 16.3 |
| E: BB Height | - | - | - | - | - | - |
| F: BB Drop | 2.7 | 2.9 | 3.0 | 3.0 | 3.0 | 3.0 |
| G: Head Tube Length | 2.7 | 3.3 | 4.0 | 5.0 | 6.0 | 7.1 |
| H: Head Tube Angle | 71.2 ° | 72.1 ° | 72.7 ° | 72.7 ° | 72.7 ° | 73.0 ° |
| I: Seat Tube Angle | 75.0 ° | 74.5 ° | 74.0 ° | 73.5 ° | 73.0 ° | 72.5 ° |
| J: Standover Height | 26.6 | 27.6 | 28.6 | 30.2 | 31.7 | 33.1 |
| K: Chainstay Length | 16.1 | 16.1 | 16.1 | 16.1 | 16.1 | 16.1 |
| L: Wheelbase | 38.1 | 38.3 | 38.4 | 39.0 | 39.6 | 40.2 |
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Most items SHIP SAME DAY if ordered by 3pm PST and FREE SHIPPING on orders over $50. Please note that oversize charges may still apply on some heavy or large items and free shipping does not apply to PO Boxes.
1-day free standard Shipping on most orders to California, 2-day free standard Shipping on most orders to Nevada, Arizona, & Utah. Other states can expect delivery within 3 to 5 days.
Jenson USA ships worldwide, including APO/FPO addresses. For a more specific shipping quote and transit time estimate, simply add the items you are interested into your shopping cart and look for the "Shipping Options" box at the top of the cart page. You don't have to login or create an account to see shipping charges and time in transit estimates.
Some manufacturers restrict where we can ship their products. If this item has shipping restrictions, they are listed below. If you'd like to buy an item that we cannot ship to your address, we can accept your foreign credit card and ship it to a US address for you.
Due to manufacturer restrictions, this product cannot be shipped to the following locations:
We strive to get you the gear you want at a competitive price. If you find an item we offer from a competitor at a lower price, let us know. We will do our best to instantly match their price. To qualify for the Price Match, your purchase must meet the following conditions:
,format=auto/globalassets/blog-articles/youtube/holiday-gift-guides-2024/hgg-blog-road.jpg)
We here at Jenson USA know it’s hard getting those items every year you didn’t ask for or need. What you really wanted was to get out there and put more miles on your bike! Well, we got you covered with some great ideas on items that will Keep you Pedaling!
,format=auto/globalassets/blog-articles/youtube/why-buy-a-bike-from-us/why-buy-a-bike-from-jenson-thumbnail.jpg)
There are so many different avenues that you can take to purchase a new bike, so what sets us apart from them? Why buy a bike from us?
Here at Jenson USA, we take great pride in making sure that your bike buying experience is confidence inspiring and trouble-free from start to finish. We want to be absolutely sure that we are providing the best possible service we can to each and every one of our customers so that there are no questions when purchasing a new bike from us!
,format=auto/globalassets/blog-articles/culture/social-ambassadors/additional-ambassadors-collage.jpg)
At Jenson USA, it's important to us to support those who are helping build the community of riders and sharing their experiences with others. To that end, we've built an arsenal of Ambassadors that we help to support.
These ambassadors are the pedal-pounding aficionados, building a following of fellow riders across social platforms; they're the lifeblood of our cycling community. Their stories inspire, their passions unites – Their the glue that binds us all. Meet some of the Ambassador crew.
,format=auto/globalassets/blog-articles/how-to-care-for-your-e-bike/e-bike-maintenence-1.jpg)
E-bikes can greatly boost your ride potential and allow you to take on all types of trails and rides you never would have been able to do on a traditional bike. However, with the added capability comes a more complex bike, higher costs, and the need to preform rigorous maintenance to keep it running at its best. In this article, we discuss what it takes to keep your E-bike ready to hit the trails or roads and why keeping up with this maintenance is important for the longevity and performance of your new two-wheeled machine.
,format=auto/globalassets/blog-articles/youtube/orca-aero.jpg)
The Orbea Orca Aero brings performance with an aero construction that openly defies the wind with panache. It brings performance and an incredible appearance that is sure to turn heads while you zip by everyone else in the peloton. Find that extra ounce of strength within a machine purpose-built for glory and seize your opportunity to land yourself on the top step of the podium.
,format=auto/globalassets/blog-articles/e-bike-guide/ebike-thumbnail.jpg)
There are few topics that spur as much debate within the bike world as the ever-growing presence of e-bikes. For some, they are an abomination to our pedal-based love, while others find e-bikes to be the very thing that got them on a bike for the first time or let’s them keep pedaling. Like many of you, we’ve wrestled with these same issues, and have found that the better we understand something the smarter we can be about deciding where we stand. This article is here to help you gain a deeper understand of what e-bikes are, who they are for, and how they fit in our world of bikes. READ TO LEARN MORE.
,format=auto/globalassets/blog-articles/youtube/kona-roadhouse.jpg)
Some things are just timeless. Like red brick is to buildings, steel is to bicycles. You may have noticed that finely constructed steel frames, crafted and welded by the best builders continue to be highly sought after for their unblemished combination of form and function.
,format=auto/globalassets/blog-articles/youtube/sage-barlow.jpg)
When it comes to frame materials, nothing brings the WOW factor quite like Titanium. This magical metal combines the excellent ride feel of a steel frame, but without the weight penalty. Not to mention, just the beauty of a Titanium frame will keep your riding buddies drooling while they are struggling to hold your wheel.
,format=auto/globalassets/blog-articles/how-to-pick-a-road-bike/how-to-pick-a-road-bike---small.jpg)
The road is calling, and you are ready to answer the call! But, figuring out the right road bike to get you started can be a challenge. While these bikes often look very similar, there a number of changes to geometry, features, and component specs that align these bikes with specific rider needs and terrain. This guide will help you navigate all the various options of road bike features and styles of riding, so you can hit the road in confidence and comfort.
,format=auto/globalassets/blog-articles/traveling-with-your-bike/travelling-with-your-bike---thumbnail.jpg)
Traveling with your bike can take you on all sorts of adventures, but sometimes it can be an adventure just trying to figure out how to safely take your bike with you. This guide is full of tips and tricks to help ease the pain of protecting your steadfast stead and finding new adventures on two wheels.
,format=auto/globalassets/landing-pages/tour-de-france/2024/tou-1.jpg)
As the Tour de France is by far the most iconic and well-known bike race in the world, it also receives the most media attention and coverage. For this reason, the tour is the most likely cycling event to reach out and grab the attention of cyclists and non-cyclists alike, who may not regularly follow the pro road cycling calendar. Any new viewer will be quick to find out that the tour can be rather difficult to fully understand, as there is a plethora of dynamics that make up the racing. Every July, a new wave of curious viewers may need some basic decoding in order to fully understand everything there is to love about this epic race. Think of this guide as a “how-to” on watching the Tour de France. After all, road racing has been called “chess on wheels.”
,format=auto/globalassets/homepage/special-offers/2025_03/fidlock-sob.jpg)
SAVE 20% ON FIDLOCK
,format=auto/globalassets/homepage/special-offers/2024-02/jensonusa-exclusives-sob.jpg)
SHOP NOW
,format=auto/globalassets/homepage/special-offers/2025_01/sob-jbs.png)
SHIP ALMOST ANYTHING & SAVE
,format=auto/globalassets/homepage/special-offers/2024-06/one-up-hub-hub.jpg)
SHOP NOW
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to 