The two main handlebar types are drop bars, curved for multiple hand positions and a more aerodynamic posture, and flat bars, straighter bars built for upright comfort and control.
Drop bars curve down and forward, putting your hands on the tops, hoods, or drops. Flat bars run mostly straight, often with a slight rise or sweep, keeping your torso up and your eyes forward. The right call depends on how you ride, how flexible you are, and where you ride.
What Do Drop Bars And Flat Bars Actually Feel Like?
Drop bars trade some comfort for speed and hand-position variety, while flat bars trade hand-position range for upright comfort, visibility, and control.
Drop bars cut wind resistance with a lower, narrower position, and a curved bar offers several places to rest your hands. The catch: reaching the drops demands a forward hinge at the hips and a bent back not every rider can hold for hours, and a deep drop can flatten your view of traffic.
Flat bars hold your torso upright, keeping your head high and traffic visible, and usually sit wider than drop bars — helpful leverage on loose surfaces and easier low-speed steering. They give up hand variety, so one grip position can leave wrists and palms aching on long rides, and extra width makes tight gaps harder to thread.
Which Handlebar Diameter And Clamp Size Do You Need?
Grip-area diameter is the fit measurement that matters most: flat bars are commonly 22.2 mm at the grip, drop bars commonly 23.8 mm. Getting this wrong is the single most common handlebar mistake.
That’s why flat-bar levers and shifters won’t fit a drop bar, and drop-bar controls won’t fit a flat bar. The clamp size where the bar meets the stem is separate — 25.4 mm and 31.8 mm are the two common sizes on both styles. Measure the old bar before shopping, and check the stem too.
If you swap bar styles, budget for new levers, shifters, and grips or bar tape alongside the bar itself.
| Handlebar Type | Typical Diameter & Clamp | Best For |
|---|---|---|
| Flat bar | 22.2 mm grip; 25.4 or 31.8 mm clamp | Upright posture, visibility, control |
| Riser bar | 22.2 mm grip; 25.4 or 31.8 mm clamp | Riders wanting a taller, more relaxed front end |
| Upright / North Road bar | 22.2 mm grip; 25.4 or 31.8 mm clamp | City bikes and casual commuting |
| BMX / cruiser bar | 22.2 mm grip; 25.4 or 31.8 mm clamp | Short, playful rides and kids’ bikes |
| Drop bar (traditional) | 23.8 mm grip; 25.4 or 31.8 mm clamp | Road, gravel, and cyclocross speed |
| Randonneur drop bar | 23.8 mm grip; 25.4 or 31.8 mm clamp | Long-distance riders wanting a flatter ramp |
| Track drop bar | 23.8 mm grip; 25.4 or 31.8 mm clamp | Track racing; deep, aggressive position |
Most riders land on a shortlist fast — and if you want to compare specific bars before committing, these tested cycling handlebar picks cover both styles side by side.
Which Handlebar Variants Are Worth Knowing?
The main flat bar variants are riser, upright/North Road, BMX, and cruiser; the main drop bar variants are traditional, randonneur, and track — each tweaks the base shape for a specific ride.
- Riser bar — a flat bar with upward sweep, giving a taller, more relaxed front end.
- Upright / North Road bar — sweeps back toward the rider, common on city bikes and casual commuters.
- BMX and cruiser bars — short, sometimes tall, built for playful riding and short hops.
- Traditional drop bar — the classic curve on road, gravel, and cyclocross bikes.
- Randonneur drop bar — a shallower, flatter-ramped drop for long-distance riders.
- Track drop bar — a deep, aggressive curve built for velodrome racing.
How Should You Decide Between Drop And Flat?
Choose flat bars for comfort, upright visibility, and low-speed control; choose drop bars for aerodynamics, narrow gaps, and multiple hand positions on longer rides.
If your rides are short, mixed-terrain, or city-bound, flat bars — especially riser or North Road — usually win on comfort and sightlines. If you’re chasing speed on pavement or gravel and can hold a forward lean, a drop bar’s multiple positions and narrower profile pay off. REI’s expert guidance flags flexibility and ride length as the two deciding factors, matching what the shape data says. Whichever you pick, get the grip diameter right — that one number decides whether your controls fit at all.
FAQs
Can I put flat bars on a road bike?
Yes, but it takes more than a bar swap. You’ll also need flat-bar levers, shifter pods, and grips, and possibly longer brake cables. The grip diameter changes from 23.8 mm to 22.2 mm, so drop-bar levers won’t fit the new bar.
Are drop bars actually faster?
They can be, mainly because a lower, narrower riding position reduces wind resistance. The gain depends on how much time you spend in the drops and how flexible you are. A rider who can’t hold the position won’t see the benefit.
What is the most common flat bar size?
22.2 mm at the grip area is standard for flat bars, with 25.4 mm and 31.8 mm the two common stem clamp sizes. Measure your old bar’s clamp area before buying a replacement.
References & Sources
- Wikipedia. “Bicycle handlebar.” Source for handlebar categories, variants, and grip/clamp diameter figures.
- REI. “Bike Handlebars: How to Choose.” Source for fit factors and ride-length considerations.
- Marin Bikes. “Should You Go Flat Bar or Drop Bar?” Source for flat-versus-drop trade-offs.