Mountain Bike Handlebars: Sizes, Widths, and How to Choose

Mountain bike handlebars typically range from 720mm to 800mm, but the widest option isn't always the best. An 800mm bar offers extra steering leverage on steep descents, yet it may feel awkward on narrow woodland trails or put too much strain on your shoulders. The real choice comes down to width, rise, sweep, material and how you ride. Here's what to look for before upgrading your MTB bars.

Flat vs Riser Mountain Bike Handlebars

Among the different types of bike handlebars, flat and riser bars are the two main options for mountain bikes. They provide similar steering control, but their height and shape create different riding positions.

Flat Handlebars

Flat MTB handlebars have little or no vertical rise, keeping the grips close to the height of the stem. They are common on cross-country (XC) mountain bikes, where efficient climbing and a lower riding position are priorities.

The lower hand position encourages riders to lean forward, placing more weight over the front wheel. This can help maintain front-wheel traction on steep climbs and keep the rider in a compact position.

Despite their name, most modern flat bars are not completely straight. They usually include some backsweep and upsweep to support a more natural wrist angle.

Riser Handlebars

Riser handlebars curve upwards from the centre, positioning the grips higher than the stem clamp. Common rise options include 10mm, 20mm, 30mm, 40mm and 50mm.

Raising the grips encourages a more upright upper-body position and reduces the amount of weight placed through the hands. It also makes it easier to shift your body backwards on steep descents.

Riser bars are particularly common on trail, enduro and downhill mountain bikes. However, increasing handlebar height can reduce front-wheel loading, potentially making it harder to maintain traction when climbing or cornering on flat terrain.

Mountain Bike Handlebar Width Explained

Handlebar width is measured from one end of the bar to the other. It affects steering leverage, arm position and how easily the bike passes through narrow spaces.

A wider handlebar increases the distance between your hands and the steering axis, giving you more leverage over the front wheel. This is useful when navigating rocks, roots and uneven ground.

However, excessive width can force your shoulders and wrists into an uncomfortable position. Riders with narrower shoulders may struggle to keep their elbows relaxed, particularly during long rides.

Common MTB Handlebar Widths

These are approximate ranges rather than fixed standards. Modern XC bikes can have wider bars, and some downhill riders use less than 780mm.

760mm vs 780mm vs 800mm Handlebars

The difference between 760mm and 800mm may seem small, but it moves each hand 20mm farther from the centre.

A 760mm bar can be easier to handle on tight woodland trails, where trees and narrow corners restrict movement. It also allows riders with smaller frames to maintain a more compact arm position.

Moving to 780mm adds steering leverage without extending the arms as far as an 800mm setup. It is a common width for trail riders who regularly encounter both climbs and technical descents.

An 800mm handlebar provides more leverage during aggressive descending. However, it can restrict upper-body movement for some riders and increase the risk of catching the bar ends on trees.

If you're currently using 800mm handlebars, trying a hand position 10–20mm farther in on each side can help you judge whether a narrower setup feels more natural before cutting the bar.

How to Choose MTB Handlebar Width Based on Your Body Size

Shoulder width is a useful starting point, but it should not be treated as a fixed formula for handlebar sizing.

Mountain bikers generally ride with their hands wider than their shoulders and their elbows slightly bent. This position gives the arms room to absorb impacts and allows the upper body to move independently of the bike.

If your handlebars are too wide, you may notice your elbows becoming excessively stretched, shoulder tension after longer rides or difficulty shifting your weight through corners.

A simple test is to compare your normal grip with a slightly narrower hand position on easy terrain. Keep your hands close enough to operate the brakes safely. If the narrower position feels more comfortable, consider testing a shorter bar before making permanent changes.

MTB Handlebar Rise and Sweep Explained

Two MTB handlebars can have identical widths but feel very different because of their rise, backsweep and upsweep.

These measurements change where your hands sit relative to the stem and how your wrists align with the grips.

Handlebar Rise

Rise describes the vertical distance between the centre clamp area and the grip position.

A low-rise handlebar, typically around 0–20mm, keeps the rider's hands relatively low. This is common on XC bikes, where maintaining weight over the front wheel can help on climbs.

A medium-rise bar of around 20–35mm raises the grips and is widely used on trail bikes. It allows a slightly more upright position without requiring a different stem.

Higher-rise handlebars, around 40–50mm or more, are often used on downhill bikes or when a rider wants a higher front-end position.

Increasing rise by 20mm will not always raise the grips by exactly 20mm compared with the previous setup, since handlebar rotation, sweep and stem position also affect their final height.

Backsweep

Backsweep refers to how far the handlebar ends angle backwards towards the rider.

Most conventional mountain bike handlebars have approximately 7–12° of backsweep, with 8° and 9° being particularly common.

More backsweep brings the hands closer to the rider and changes the wrist angle. Riders who experience wrist discomfort with straighter handlebars sometimes prefer a greater backsweep.

However, it also reduces effective reach. A handlebar with 12° of backsweep can bring the grips noticeably closer than one with 7°, even when both are 780mm wide.

Upsweep

Upsweep describes how much the handlebar ends angle upwards when viewed from the front. Many MTB handlebars use approximately 4–6° of upsweep.

It works alongside backsweep to determine the resting angle of your hands.

Rotating the handlebar within the stem changes how these angles feel. If your wrists feel awkward after fitting new bars, check their rotation and brake lever position before considering another replacement.

31.8mm vs 35mm MTB Handlebars

Most modern MTB handlebars use either a 31.8mm or 35mm clamp diameter. This measurement refers to the central section held by the stem, not the overall width or the diameter of the grips.

The 31.8mm standard is widely used on XC, trail and enduro bikes. It offers a broad choice of compatible handlebars and stems.

The 35mm standard is also common on modern trail, enduro and downhill bikes. Its larger central section gives manufacturers more options for adjusting stiffness through the handlebar's construction.

However, a 35mm bar is not automatically stronger or more comfortable. Actual stiffness depends on the material, wall thickness, layup and shape.

If you're replacing your handlebars, check the existing handlebar diameter before ordering. A 35mm bar cannot fit a 31.8mm stem, while a 31.8mm bar requires a suitable, manufacturer-approved shim to fit a compatible 35mm stem.

Aluminium vs Carbon Mountain Bike Handlebars

Aluminium and carbon fibre are the two main materials used for modern mountain bike handlebars. The main differences are weight, price, construction and how each design responds to impacts and vibration.

Aluminium MTB Handlebars

Aluminium handlebars are widely used because they offer good strength at a reasonable price. They are available in a large range of widths, rises and clamp diameters.

Many aluminium MTB bars weigh approximately 250–350g, although lightweight XC models can weigh less and reinforced downhill models can weigh more.

Aluminium bars are also generally less expensive to replace after a crash. However, they can still bend, crack or suffer fatigue damage, especially around the clamp area.

For riders who frequently ride rocky trails, an aluminium handlebar is a practical option, particularly when paired with well-chosen grips and correctly adjusted suspension.

Carbon MTB Handlebars

Carbon handlebars are often lighter than aluminium alternatives, with many models weighing around 180–250g, depending on their width and intended use.

Their construction allows manufacturers to control stiffness and flex by changing the orientation of the carbon fibres. Some models are designed to reduce vibration transmitted through the grips.

However, carbon does not automatically provide better vibration damping. A particularly stiff carbon bar may feel harsher than a more flexible aluminium model.

Carbon handlebars also require careful installation. Incorrect tightening torque or damage from a crash can compromise the structure, even when there are no obvious external cracks.

Aluminium vs Carbon MTB Handlebars: Quick Comparison

The weight ranges overlap, so compare actual manufacturer specifications rather than assuming every carbon bar is lighter.

Which Mountain Bike Handlebars Suit Your Riding Style?

The demands of cross-country, trail, enduro and downhill riding are different. Handlebar width and height should reflect the terrain and how much time you spend climbing or descending.

Cross-Country Mountain Bikes

Cross-country riders often use handlebars around 700–760mm wide, although wider models are increasingly common on modern XC bikes.

Flat and low-rise bars are popular because they encourage a lower riding position and help maintain front-wheel traction during steep climbs.

Weight also matters in competitive XC riding. Lightweight carbon handlebars can reduce overall bike weight, although aluminium remains a practical choice for recreational riders.

On narrow, wooded courses, a 720mm or 740mm bar can offer more clearance between trees than wider trail setups.

Trail Mountain Bikes

Trail mountain bikes commonly use 760–780mm handlebars, although some come with 800mm bars.

A riser handlebar with 20–35mm of rise is a common setup for mixed terrain. It provides a moderately high grip position for descending while allowing riders to lean forwards when climbing.

Trail riders who frequently encounter narrow woodland singletrack may prefer a slightly narrower bar. Those riding open, rocky terrain may benefit from the additional leverage of a 780mm or 800mm setup.

Enduro and Downhill Mountain Bikes

Enduro and downhill mountain bikes often use 780–800mm handlebars, with some models exceeding 800mm.

These wider bars provide greater steering leverage on steep descents, particularly over rocks, roots and large trail obstacles.

Riser handlebars are also common, with many gravity-focused setups using 20–50mm of rise.

These bikes typically have short stems, which influence the relationship between handlebar width, reach and steering response. A wider bar can make the effective riding position feel longer, even without changing the stem.

Electric Mountain Bikes

Electric mountain bikes often weigh more than comparable non-electric models because of their motors and batteries. Wider handlebars can provide additional leverage when steering a heavier bike, particularly at low speeds or on uneven ground.

Many electric MTB handlebars use standard 31.8mm or 35mm stem clamps, but the cockpit may also include displays, assistance controls and additional wiring.

The Tesway X9 Ultra provides a different example from a conventional trail MTB. It uses 26 × 4.0-inch Kenda fat tyres, a dual-motor AWD system and full suspension. Its size guide lists a 29-inch handlebar length, approximately 737mm.

When considering a wider or higher handlebar for this type of electric bike, check the available space for brake levers, throttle controls, shifters and the display. The replacement must also allow full steering movement without stretching electrical wires or brake hoses.

Can You Cut Mountain Bike Handlebars Shorter?

Many MTB handlebars can be shortened, provided the manufacturer allows it. Some models include printed cutting marks that indicate the permitted trimming range.

For aluminium bars, use a suitable cutting guide and the tool recommended by the manufacturer. Remove equal amounts from both ends and carefully finish the cut edges.

Carbon handlebars require specific cutting tools and procedures. Never cut a carbon bar unless the manufacturer confirms that trimming is permitted.

Cutting also changes how the handlebar flexes. A shorter bar generally has a shorter lever arm and can feel stiffer than the same model at its original width.

An 800mm bar shortened to 760mm will not necessarily feel identical to a handlebar originally designed at 760mm.

Before cutting, make sure enough straight mounting space remains for the grips, brake levers, shifters and any other controls.

What to Check When Replacing MTB Handlebars

Before buying new mountain bike bars, check that the clamp diameter matches your stem. Most modern models use 31.8mm or 35mm, while some older bikes have smaller clamp sizes.

Compare the new handlebar's width, rise and sweep with your current setup. A wider bar or higher grip position may require longer brake hoses, gear cables or electrical wiring.

Also check the straight mounting area near the grips. Some handlebars have shaped or reinforced sections that limit where brake levers and other controls can be installed.

When fitting the replacement, follow the manufacturer's specified tightening torque. After installation, check the brake levers, shifters and cables, and confirm that the handlebars turn fully in both directions without pulling on any hoses or wires.

Conclusion

For a modern trail bike, 760–780mm aluminium riser handlebars with 20–30mm of rise offer a useful starting point. Before replacing your current bars, compare their width, rise and backsweep with the new model. If you want a narrower setup, test the hand position first and trim only within the manufacturer's limits. Always confirm stem compatibility before ordering.

FAQs

How wide should mountain bike handlebars be?

Most modern mountain bike handlebars measure 740–800mm wide. Cross-country riders may prefer narrower bars, while trail and downhill riders often choose 760–800mm for extra steering leverage.

Are wider MTB handlebars better?

Not always. Wider handlebars provide more steering leverage on rough terrain, but excessive width can cause shoulder discomfort and make narrow trails harder to navigate.

How do I choose the right handlebar width for my mountain bike?

Consider your shoulder width, arm length and riding style. Start with your bike's existing width, test a narrower hand position and adjust based on comfort and control.

Are 800mm handlebars too wide?

For some riders, yes. While 800mm handlebars are common on enduro and downhill bikes, smaller riders and those cycling on narrow trails may prefer 740–780mm.

Should MTB handlebars be wider than my shoulders?

MTB handlebars are generally wider than your shoulders, but there is no fixed ratio. Your arm position, comfort and steering control matter more than shoulder width alone.

Are flat or riser handlebars better for mountain biking?

Flat handlebars suit riders who prefer a lower front-end position. Riser handlebars raise the grips, making a more upright posture possible and changing weight distribution.

What is the best handlebar rise for MTB?

A 20–30mm rise is common on trail bikes, while some riders prefer 40–50mm for a higher grip position. The best rise depends on your bike geometry and riding posture.

Can you cut mountain bike handlebars shorter?

Yes, many MTB handlebars can be shortened within the manufacturer's limits. Cut equal amounts from both ends. Carbon handlebars require specific manufacturer approval and cutting procedures.

Are carbon mountain bike handlebars worth it?

Carbon handlebars are often lighter than aluminium models and may offer better vibration control. However, comfort depends on the design, and aluminium bars remain a practical, lower-cost choice.

What is the difference between 31.8mm and 35mm MTB handlebars?

These measurements refer to the stem clamp diameter. A 35mm bar can offer greater stiffness, but neither size is automatically better. Both require a matching stem.

What does backsweep mean on MTB handlebars?

Backsweep is the angle at which the handlebar ends bend towards the rider. Many MTB bars use 7–12° of backsweep, affecting wrist position, reach and comfort.

How high should mountain bike handlebars be?

There is no fixed height. Cross-country riders often use lower handlebars for climbing efficiency, while trail riders may prefer a higher position. Stem spacers and handlebar rise allow adjustments.