Gravel Bike Handlebars Explained

A gravel handlebar looks like a road bar that has been bent outward at the bottom, and that is roughly what it is. The listing for a bar will quote four numbers — width, flare, reach and drop — and none of them means anything until you know where on the bar it is measured. This page explains the four, tells you what is probably on your bike already, and then explains the one thing you must measure before ordering a replacement.

The four numbers

Width is the distance across the bar, and it is the one to be careful with, because different makers measure it in different places. Salsa quote their Cowchipper widths “measured at the hoods”; on a flared bar the drops are wider than that, which is why Ritchey note that gravel bars are often listed with two widths. Read the small print before you compare two bars.

Flare is the angle at which the drops splay outward. Ritchey put it simply: “by flaring the bars in the drops, the total bar width increases based on the degree of flare,” and the wider your hands are in the drops, the more control you have on rough ground. Their own bars run from a “subtle 12°” to a “sweeping 27.5°”; Salsa’s Cowchipper, one of the most common gravel bars, is 24°.

Reach, in Ritchey’s definition, is “the distance in millimeters from the center of the bar clamp to the end of the bar where your hoods would be.” Shorter reach brings the hoods closer to you.

Drop is “the distance in millimeters from the center of the bar’s top to the lowest point in the center of the drops.” A shallower drop makes the low position less extreme. The Cowchipper publishes 116mm of drop and 68mm of reach, which is short and shallow by road standards, and that combination is the point: gravel bars are designed so that a normal person can actually use the drops on a descent.

What is probably on your bike now

An entry-level gravel bike ships with an aluminum bar the manufacturer chose for the frame size, with a modest flare and a shallow drop. The Amazon listings for the bikes on our gravel page publish none of the four numbers, which is normal; you find them by looking under the bar tape near the stem, where most bars have the width and clamp size printed.

The good news is that the stock bar is almost never the problem. Numb hands, a sore neck and aching shoulders on a new bike are nearly always saddle height, reach or stem length, and the fit guide fixes those for free. Change the bar only when the fit is right and a specific complaint remains.

How to choose a width

The old road rule was to match your shoulder width at the hoods, and it is still a reasonable starting point. Gravel bars are sold in a wide range — the Cowchipper runs from 38cm to 52cm in 2cm steps — and the trend is toward wider than the road rule, because Salsa’s own experience with their widest sizes is that “the added control is noticeable right away” and the width “makes the move from mountain bike to drop-bar bike more instinctive.”

Two honest cautions. First, wider bars are slower into a headwind and can make the front of a small frame feel like a shopping cart. Second, a wider bar often needs longer brake and gear cables, which turns a simple swap into a shop job. Go one size wider than stock if you go at all, not three.

How much flare you actually want

More flare helps in the drops on rough descents and almost nowhere else. If you ride the hoods all the time — most beginners do — the flare of your bar is close to irrelevant, and the bars with the biggest numbers put the brake levers at an angle that some people find awkward on the hoods. A modest flare in the teens or low twenties is the right answer until you find yourself wanting more on a specific descent.

The one measurement before you buy a new bar

Clamp diameter. Park Tool’s installation guide is blunt: “it is also important that the bar diameter and the stem clamp diameter are the same,” and you should “measure right where the stem will clamp using a metric caliper” because “some clamp diameters are within fractions of a millimeter of each other and are not cross-compatible.” Modern drop bars are mostly 31.8mm — the Cowchipper is — but older and cheaper bikes can be 25.4mm or 26.0mm, and a 26.0mm bar in a 25.4mm stem is a crash waiting to happen.

Park Tool also note that the stem’s clamp size is “typically engraved or labeled on the stem, but sometimes it is not.” If it is not, measure the bar you are removing rather than guessing.

What a bar swap actually involves

More than the listing suggests. Following Park Tool’s sequence, you photograph the current lever positions, unwrap the tape, remove the brake levers from the old bar, fit them to the new one, set the bar roll and lever position identically on both sides, torque the stem faceplate to the printed figure, and then re-wrap. The torque step is not optional — a handlebar that slips under braking is the failure mode — and the re-wrap means a new roll of tape every time.

That is why the picks below are tape and a torque wrench rather than a handlebar. We do not stock a bar in the registry, and we would not recommend one without knowing your clamp size and stem; what every bar swap needs regardless is the wrap and the wrench.

The honest summary

For a first gravel bike, the bar that came on it is fine. Get the fit right, wrap it in tape you like, and ride it for a season. If after that you still want your hands wider in the drops on descents, buy a bar one size wider with a flare in the twenties, check the clamp size with a caliper first, and budget for tape, possibly cables, and an hour with a torque wrench. The budget upgrades page puts the handlebar in context against the changes that matter more.