Coefficient RR vs SQlab 312 R: Two Ergonomic Drop Bars Compared

Specifications from each manufacturer's website, checked September 30, 2026.

If you are shopping for an ergonomic drop bar, the SQlab 312 R Carbon and our Coefficient RR will probably both end up on your list. Both are carbon drop bars sold on their ergonomics, and they disagree on one basic point: the two bars angle their tops in opposite directions.

We make the RR, so keep that in mind as you read. We have stuck to what each company publishes and quoted SQlab in its own words, and we say plainly where the 312 R may suit you better.

The short version

The SQlab 312 R Carbon has level tops with a front sweep of 10° that tapers to 2° toward the ends, 0 mm of rise, a 120 mm drop, 80 mm of reach and 1.5° of flare. SQlab sells it as a road bike handlebar that is "Light | ergonomically shaped".

On the Coefficient RR, the tops slope down 15 degrees toward the hoods and sweep back 12 degrees. We call that shape SWOPE (sweep + slope). The RR has a 127mm drop, 77mm of reach and 7 degrees of flare.

SQlab lists 0 mm of rise for the 312 R.

Specifications side by side

Figures are copied from each maker's product page, in each maker's own units.

SQlab states its widths center to center. Our product page lists the RR by size, from 36cm to 44cm, so before you order, compare against your current bar measured the same way.

On paper the 312 R is the lighter bar. The RR includes your choice of computer mount, and our product page points out that "the average off-the-front computer mount weighs in at 30 to 40 grams", so factor in whatever mount your current bar needs.

SQlab also sells a 312 R Carbon Integrated with the same geometry plus internal cable routing. It is built for electronic groupsets only (Di2, eTap, AXS), and SQlab lists it at approx. 198 / 206 / 212 / 220 g.

Sweep, slope and rise: what the numbers mean

Sweep is the angle of the tops seen from above. A back sweep angles the tops rearward, toward you, as they run out to the bends; a front sweep angles them forward. Slope is the angle seen from the front: sloped tops drop away toward the hoods instead of staying level with the clamp. Rise is how far the tops sit above the stem clamp, and a riser bar lifts your hands higher.

SQlab's approach: front sweep on level tops

SQlab explains its reasoning on its handlebar concept page. For grips wider than the shoulders, as on a mountain bike, it uses back sweep. For the narrower grip on a road or gravel bar, SQlab writes that "a backsweep would even hyperextend the wrist again. This is why our road bike and gravel handlebars have a frontsweep of 10° to ensure a straight transition from the forearm to the hand."

The 312 R pairs that front sweep with a broad, flattened top. In SQlab's words, "The flattened and forward-extended top section creates a maximized contact area." Underneath is the Ergobar, "a wave-shaped elevation on the underside of the handlebar". SQlab says its pressure mapping "shows that the maximized contact area of the 312 R handlebars enables an even, ergonomic distribution of pressure across the hands".

Coefficient's approach: SWOPE

SWOPE changes the tops in two planes at once. They slope down 15 degrees toward the hoods and sweep back 12 degrees, so your hands rest on a surface angled downward and rearward rather than on a level tube. The drops below carry 7 degrees of flare. Our AR uses the same SWOPE geometry.

The longer story of how the shape was developed is on The Science page.

So SQlab angles the tops forward and keeps them level, and we angle them back and down. Hands differ, and riding the bar is the surest way to find out which suits yours.

How the rest of the geometry compares

By each maker's figures, the RR's 127mm drop is 7 mm deeper than the 312 R's 120 mm. If you want SWOPE tops with a shallower drop, the AR has a 120mm drop, the same as the 312 R.

Reach is 77mm on the RR against 80 mm on the 312 R, so the RR's reach is 3 mm shorter.

SQlab says the 312 R's 1.5° flare "subtly opens the drops outward". The RR's 7 degrees opens them out further.

Which should you choose?

Choose the SQlab 312 R if…

• you prefer level tops and like SQlab's argument for front sweep on a narrow grip;
• you want a broad, flattened top with the Ergobar underneath;
• weight on paper matters most (235 to 250 g by SQlab's figures);
• you want very little flare in the drops;
• you run an electronic groupset and want the cables routed through the bar into the stem clamp, in which case look at the 312 R Carbon Integrated;
• you want a little more reach (80 mm) and a shallower drop (120 mm).

Choose the Coefficient RR if…

• you want tops that slope down toward the hoods and sweep back, rather than sit level;
• you ride road and gravel on the same bar. The RR is built for both. It leans road, with a firmer, faster feel, and Ian Boswell won the 2021 Unbound Gravel 200 on it (Bike Perfect's pro-bike feature shows his bike);
• you like more flare in the drops (7 degrees) and a deeper drop (127mm);
• you want a computer mount included with the bar.

If you like the SWOPE shape but want a more compliant ride, look at the AR. It leans gravel and all-road, is quick on the road too, and comes in 38 to 46cm with a 120mm drop and 77mm reach. Both bars are on our handlebars page.

FAQ

What handlebar width should I choose?

Both companies start from shoulder width. SQlab measures it between the outer edges of the acromion, the bony points of your shoulders, and says a road bar "should match the shoulder width approximately" (its gravel advice adds 2 cm). Our product page says: "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."

Which bar is better for numb hands or wrist pain?

No handlebar can promise to fix numb hands, and if numbness or tingling keeps coming back, see a bike fitter or a doctor. The two bars set your hands differently: SQlab uses front sweep to keep the wrist in line with the forearm, and SWOPE angles the tops down and back. Our guide to why your hands go numb when cycling covers the common causes.

Will either bar fit my stem?

Both use a 31.8 mm clamp. SQlab lists a stem clamping width of 40 to 58 mm for the 312 R, and we list a clamp area width of 56mm for the RR, so check your stem's clamp width against those figures. For the RR, follow our installation guide. We recommend that only a qualified bike mechanic install this handlebar, and please do not use carbon paste to mount your bar on your stem.

Sources: SQlab 312 R Carbon product page, SQlab 312 R Carbon Integrated product page and SQlab handlebar concept page, all checked September 30, 2026; Coefficient RR and AR product pages, checked the same day. Specifications can change, so check the maker's page before you buy.