Coefficient AR Carbon Gravel Handlebar

$617.00 CAD

Crafted for a new era of cycling, the Coefficient AR Handlebar merges forward-thinking ergonomics to give you the ultimate comfort when cycling.

30-day returns · 2-year warranty · Crash replacement discount

Why your hands go numb on the bike →

Glad to see a company that dares to be innovative

Glad to see a company that dares to be innovative. Keep up the great work>

The shape is perfect but internal routing

The shape is perfect. Could you make the internal routing easier?

Nice upgrade

Hand position helps relax shoulders. Short drops let me stay in them longer

I'm not a person that's easily impressed, but I have to say these bars have been both amazing and a godsend for someone like me.

At 6'3" I'd been suffering from pain, numbness and tingling in my hands after getting back into road biking several years ago, plus neck stiffness and pain in a torn rotator cuff, especially on long rides. I'd tried a lot of ways to ameliorate these challenges, including probably 2+ dozen different gloves, as well as shortening and using a riser stem, but was still putting too much pressure on my hands, even when consciously trying to avoid gripping too hard.

I'd been contemplating swapping my alloy straight drop bars for carbons ones for awhile, then stumbled on these and figured I'd try them. On my first ride with them (a 40-miler), I noticed a HUGE improvement in my hand issues, conservatively about a 90% decrease, a marked drop in neck stiffness and issues with my rotator cuff (probably around 70-75%), along with a notable decrease in fatigue, while interestingly seeming to help drive a 1+ mph increase in my average speed,

These bars not only absorb rough road vibrations very well, but the design is excellent for encouraging postures that relax your hand, arm and neck positions for more comfortable riding - they're the real deal. I'm looking forward to not only getting years of more comfortable riding out these bars, but taking advantage of using the holes for internal cable routing when it's time to replace shift and brake cables.

Already have the Road Bars on my Calfee Tetra Pro - Absolutely love the bars.

I put the AR Bar on my Calfee Adventure, while not as comfortable as the Road Bar, perhaps due to it being Round vs. Flat on the Tops? It is still vastly superior to a Standard Road Bar.
It is all about the "SWOPE" and the Comfort it provides. The wrist/ shoulders are placed in a position that reduces fatigue. I also appreciate the shallow drops and the strategically placed indentations at all the correct places. It is worth the upgrade. Another well designed and manufactured product.

Thanks Coefficient.

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Description

The Coefficient AR Handlebar is engineered to optimize your position and performance on the bike, whether you're tackling your daily commute or an all-day epic. Our unique aero-ergonomic design combines a precise slope and sweep (what we call SWOPE) to put you in a more comfortable and efficient riding position. This isn't just a slight improvement; it's a difference you can feel, translating into better speed and endurance with less fatigue. You're not just buying a handlebar—you're upgrading your entire riding experience.

Proportional Sizing Syncs Bar Width & Grip Size

Riders of smaller stature generally have small hands. Proportional sizing is all about the grip diameter of the Coefficient AR's tops. As you’ll read in the technical specifications, a 38cm bar has a much smaller grip diameter than a 44cm bar.

Lightweight Materials

The Coefficient AR Handlebar is moulded using Toray unidirectional carbon fibre and tested to the highest ISO international standards for professional road and mountain bike racing.

SWOPE Design

SWOPE is our unique bar-top shape combining downward slope and rearward sweep to place your shoulders, arms, and wrists in a more natural position. This greatly improves metabolic, ventilatory, and aerodynamic efficiency.

TECHNICAL SPECS

Sizes Available: 38cm / 40cm / 42cm / 44cm / 46cm

Drop: 120mm

Reach: 77mm

SWOPE (sweep+slope): Sweep - 12 degrees / Slope - 15 degrees

Flare: 10 degrees

The Science behind our handlebars

Dive into the science and see real life wind tunnel results that prove why Coefficient handlebars are a game-changer.

Learn More

Don't just take our word for how good our bars are, listen to professionals within the industry.

Coefficients products are the top choice for professionals across the cycling industry. From elite racers to seasoned mechanics, countless experts rely on our components for their durability, performance, and precision. We're proud to be the trusted brand for those who demand the best from their equipment.

Close-up of a bicycle handlebar with brake levers and gear shifter, blurred background

Installation

For a safe and successful installation, it is crucial to follow the instructions in the official install guide.

View Install Guide →

Frequently asked questions

A good starting point is to match bar width to your shoulder width, so your arms sit in a natural line. From there, a narrower bar is a little more aero, while a wider bar adds leverage and steadier control on rough ground. Take this as guidance rather than a rule; the width that stays comfortable deep into a ride is the right one. The AR comes in 38, 40, 42, 44 and 46 cm widths, and its proportional sizing pairs narrower widths with a slimmer top grip for smaller hands.

Each Coefficient Handlebar is shipped with comprehensive installation instructions. We recommend that only a qualified bike mechanic install this handlebar. Please follow these installation instructions very carefully. An improperly installed handlebar can lead to damage to the product (nullifying its warranty) or damage to your bike. Downloadable Installation Instructions can be found near the top of the Tech Specs page.

PLEASE NOTE - do not use carbon paste to mount your bar on your stem.

Hex Drive Flat Head Screw with 90° Countersink Angle: M4 x 0.70 mm Thread, 8 mm long.

The pivot/knuckle screw is M5x1x20mm button head. The mounting screws are M4x0.8 flat head.

Bar Fly GoPro-compatible base instructions

If after riding you determine the Coefficient bar is not for you, return it within 30 days of receipt with your receipt for a full refund. Full refunds will only be honoured for handlebars that are returned undamaged, in “like new” condition. Shipping costs are not included in refunds.

Coefficient Cycling warrants each new Coefficient Handlebar against defects in workmanship and materials for a period of two full years from date of purchase. This warranty is strictly limited to the replacement of a defective handlebar. This warranty applies only to the Coefficient bar's original owner and cannot be transferred.

Warranty does not cover normal wear-and-tear, incorrect assembly, or any damage caused by the partnering with incompatible components or attachment of accessories. Warranty does not apply to damage or failure due to accident, abuse, misuse or neglect. In case of handlebar replacement, labor costs for switching handlebars are not covered by the warranty.

Warranty claims must be made through authorised Coefficient retailers or directly with Coefficient Cycling.

Yes we do. Sometimes accidents happen. You might bin it at a crit race or your roof rack has a bad day... we can offer you 30% off a new bar PLUS we'll throw in a new pack of bar tape (if available). Get in touch and we'll issue you a code to use on site.

We ship to most countries. If we are not set up to ship to yours, email info@coefficientcycling.com and we will help. Freight, duty and tax fees may apply.

Shopping in the UK? Visit our UK store: coefficientcycling.co.uk (ships within the UK).

Shopping in Europe? Visit our EU store: coefficientcycling.eu (ships within the EU).