Grip is the thing that changes
A bike stays upright and turns because the tyres grip the ground. On clean, dry tarmac that grip is generally high and predictable. On almost every other surface it is lower, less even, or both. Most of the skill of riding on mixed surfaces comes down to one idea: ask less of the tyres when there is less grip to give.
Each tyre can only do so much at one moment. It can brake, it can turn, or it can do a bit of both, but the total is limited. If you are already leaning hard in a corner, there is little grip left for braking. This is why the advice on every surface below sounds similar: slow down earlier, brake before the turn rather than in it, keep your movements smooth and keep your weight steady.
Tarmac
Dry tarmac is the baseline. Even here, things change: a patch of sand, leaves, a smooth repair strip or a painted line can each reduce grip suddenly. Looking ahead helps, and the habit of reading the road ahead is the same on every surface. Wet tarmac is covered further down, because rain changes it a lot.
Gravel
Gravel is loose stones sitting on a firmer base. The stones roll under the tyres, so grip is lower and the bike can move around a little. Generally this feels like the bike is wandering rather than sliding, and the best response is to stay relaxed. A tight grip on the bars passes every wobble straight to the steering.
Slow down before bends, keep your pedals level through them, and brake gently and in good time. Braking hard on loose stones can lock a wheel. The key point is simply that gravel asks for earlier, gentler inputs.
Dirt
Packed dirt can be wonderfully grippy when dry and firm. It can also be dusty, which acts like a thin layer of ball bearings, and it turns slippery and sticky when wet. The surface often changes within a few metres, with hard patches, soft patches and ruts. Treat dirt as variable and look for the line that looks darker and firmer rather than loose and powdery.
Grass
Dry grass can give surprisingly decent grip, but wet grass can be very slippery, especially when you try to turn or brake. The ground underneath may also be bumpy or hide holes. Grass is a good place to practise slow skills because falls are softer, but ride it deliberately: steer smoothly, avoid sudden braking and keep your speed low until you know what is under the surface. Cyclocross riders practise mud and grass handling for exactly this reason.
Cobbles
Cobbled streets are uneven and often polished smooth by traffic, so they can be slippery when wet. The bumps tend to shake the front wheel sideways. Many riders find it easier to hold the bars lightly, keep a steady pace, stay seated or lightly stand with relaxed elbows, and avoid braking or turning sharply while the wheels are on the stones. Wider tyres at a sensible pressure usually help comfort, though the right pressure depends on the bike, so follow the tyre’s guidance.
Wet paint, metal and other slippery surfaces
Painted road markings, manhole covers, metal bridge joints, tram tracks and wooden boardwalks can become very slippery in the wet, even when the tarmac around them still grips. Slippery surface clues include a shiny look, a smooth texture and a surface that is darker where water sits. Where possible, cross these features upright and in a straight line, with no braking or leaning while on them. Tram or rail tracks are best crossed at a wide angle to the rail, not along it, so a wheel does not get trapped in the groove.
Riding in the rain in general means longer stopping distances. Allow more space, brake earlier and expect tyres to grip less. Tyre tread and grip are a topic in their own right, but the main point is that tread pattern matters less on hard, smooth surfaces than rubber type, tyre width and pressure.
Adjusting speed, braking and lean
A few habits carry across all surfaces:
- Speed: choose a speed at which you could stop within the distance you can see, and drop it where grip looks poor.
- Braking: use both brakes smoothly, and do most of the slowing before a turn. Front and rear brake use differs by surface; on loose ground the front brake especially needs a gentle touch.
- Lean: on grippy surfaces you lean the bike more. On loose or wet ones, a more upright bike and a smoother, wider turn leave grip in reserve. Your choice of cornering line affects how much lean you need.
- Weight: keep your weight centred, with relaxed arms and level pedals when coasting through a corner.
- Hands: a light, loose grip lets the bike move beneath you.
Changing between surfaces
The riskiest moment is often the transition: tarmac to gravel at a driveway, a muddy edge to a path, or a patch of leaves after a dry stretch. Slow down before the change, not on it. If a path turns from solid to sandy, expect the front wheel to feel vague and keep the bars steady. Riding in sand is its own challenge, so if you meet it, ease off the speed and try not to turn the bars sharply.
Practise somewhere safe
Try slow-speed turns and gentle braking on a quiet patch of grass or a car-free path, wearing a helmet and suitable protection. Increase speed only in small steps. This is general information, not coaching, and conditions vary a lot by place, bike and tyre. If a surface looks beyond your comfort, walking is always an option.