The gravel bike guide
If you can only own one bike, it is probably this one
A gravel bike is a road bike that has stopped being precious about the surface. Same drop handlebars, same general shape, same efficiency, but with room for tyres nearly twice as wide, a slightly taller and more relaxed frame, and lower gears for grinding up loose climbs.
It is the newest of the main categories, and it exists because of how people actually ride. Most rides are not purely road or purely trail. They are a bit of road to get out of town, then a dirt road, then a bike path, then road home. A road bike is nervous on two of those and a mountain bike is slow on two of them, while a gravel bike is decent at all four.
- Surface
- Tarmac, dirt roads, rail trails, easy singletrack.
- Position
- Leaned forward like a road bike, but a bit taller and calmer.
- Tyres
- 38 to 50mm with light tread, which is where most of the difference comes from.
- Typical new price
- $1,500 entry alloy, $3,500 and up for carbon
| Road | Gravel | Mountain | |
|---|---|---|---|
| Handlebars | Drop | Drop, often flared | Flat |
| Tyre width | 25 to 32mm | 38 to 50mm | 55 to 65mm |
| Suspension | None | None, usually | 100 to 170mm |
| Fastest on tarmac | Yes | Nearly | No |
| Handles rough trail | No | Up to a point | Yes |
Gravel sits deliberately in the middle, which is both the appeal and the compromise.
Why it is often the sensible answer
Fit slick tyres and a gravel bike is maybe 5% slower than a road bike on tarmac, a difference only a racer notices. Fit knobbly ones and it will handle most of what a hardtail mountain bike handles, short of properly technical descents. Almost all of them have mounts for racks, mudguards and bags, so the same bike commutes, tours and does the Saturday ride.
That is the case for it. Not that it is the best at any one thing, but that it is decent at all of them, and most people only have room and budget for one bike.
The counterargument is worth taking seriously though. If you know that 95% of your riding is smooth tarmac, buy a road bike, and if you know it is technical trail, buy a mountain bike. A gravel bike is the right answer to uncertainty rather than to a clear brief.
What you would ride it for
- Rail trails and dirt fire roads, which is the classic use
- Mixed-surface loops that link road sections with unsealed ones
- Bikepacking and touring, with bags strapped to the frame and forks
- Commuting on a route with potholes, tram tracks or a gravel shortcut
- Gravel events and long unsealed rides
What to look for
Tyre clearance is the spec that matters most, since a frame that takes 45mm or more gives you far more options later than one capped at 38mm. Gearing matters next, because loose climbs need lower gears than road riding does, so look for a 1x setup or a wide-range cassette. Then check the mounts. Rack, mudguard and third bottle-cage bosses cost nothing to include and are frustrating to lack.
Flared drop bars, where the drops angle outward, are common and worth having. They add stability on loose descents without costing you anything on the road.