The forecast said maybe. Now the road is shining, the gutters are running, and every white line and drain cover looks a little less friendly than it did this morning. You’re trying to remember whether wet roads actually bite, or whether that’s just something people say.
Riding your bike in the rain doesn’t have to mean white-knuckling every bend.
It mostly comes down to a handful of changes. We’ll go through them in ride order, from your tires to the moment you should get off the bike.
For the clothing side, we have a separate commuting-in-the-rain guide.
How Much Riskier Is Riding in the Rain?
We’ve all squinted through rain-streaked glasses and wondered whether to turn around. A 2023 study of police-reported bike crashes in Copenhagen, Denmark, adjusted for how many people were actually out riding and still found crash risk about 20% higher in rain and about 30% higher when rain arrived with wind.
💨 You have to be careful of strong winds with the rain. It can be a dangerous combo.
So yes, wet riding carries extra risk, and it’s not all in your head. That risk often comes through things you can see coming. The first of them is the part touching the road.
Let a Little Air Out (Less Than You’ve Heard)
Tire pressure is the cheapest wet-road adjustment you own. A tire with a little less air squats slightly and puts more rubber on the road. Schwalbe’s guidance says lowering pressure can provide more grip, but never to go below the tire’s minimum.
Specialized product manager Oliver Kiesel says the brand’s pro team partners typically drop 5 to 7 psi for wet races on 26 to 28 mm road tires. On wider tires, he suggests about 3%.
Compare that with the advice to let out a full bar. On a 28 mm tire at 70 psi, 5 psi less takes you to 65 psi. A bar, about 14.5 psi, drops you near 55.
🔧 I don’t bother letting air out in the rain, because I don’t run high pressures anyway. I like to keep them lower generally. If I did run high pressures, I’d probably let a little air out.
All of this assumes your dry pressure is already right. The tire pressure guide walks through the chart.
Why tire width matters explains why wider tires already grip better in the wet.
Then there’s the hydroplaning worry. The NASA hydroplaning formula, built for car and aircraft tires, puts full hydroplaning at about 65 mph (105 km/h) at 40 psi. At bike speeds, that simply isn’t the problem.
Sheldon Brown argued that tread does nothing for wet pavement grip, though Jan Heine counters that a light file tread at the tire’s edges helps in wet corners.
A few psi, not a bar, is the wet-road rule.
But grip at the tire is only half of stopping.
Brake Earlier, Because Wet Brakes Need a Moment
A 1977 federal brake report from the US National Bureau of Standards found water on the braking surface generally hurts stopping more than water on the road. In lab data it cited, rubber pads on a wet aluminum rim kept only 32% to 61% of their dry friction.
There’s also a delay before wet rims start to bite. The same report cited a test in which wet brake friction didn’t begin recovering until the wheel had turned at least four times.
On a road wheel that’s about 28 feet (8.5 m), roughly a second at 20 mph (32 km/h). Pad compounds have improved since 1977, so don’t take that second as a modern number. Do take the point: wet brakes lag.
Our rules follow from that. Lightly drag rim brakes every so often to wipe the rims before you need them. Brake earlier and more gently, with both brakes, while the bike is upright.
👍 In my experience, rim brakes in the rain just aren’t as good as discs.
Disc brakes bite sooner in the wet, but the tire has less grip on a wet road, so stopping distances still grow. Carbon rims with rim brakes are worse again, and our disc-versus-rim guide covers the trade.
Finish your braking before the bend.
Which brings us to the bend itself.
Taking Corners on Wet Roads
The wet corner is where most of the fear lives, and the fix is to make the turn boring. Slow down and brake before the turn, while the bike is upright. Take a wider, smoother line.
Lean the bike less than you would in the dry, keep your weight on the outside pedal, and stay seated. No hard pedaling, no braking, no mid-corner line changes, especially over paint. For more cornering technique, our descending guide is the next read.
⚠️ My back wheel slid out when I was going around a slight turn on a bridge. I wasn’t even going fast, but it was ever so slightly damp on the bend (it was under a tree, which kept the moisture), and it took me by surprise and I fell. I bruised my hips and bent my rear derailleur, but I lived to fight another day.
All it took was a damp patch in the shade. In the wet, grip can run out even when your speed feels sensible.
Less lean, and no surprises mid-corner.
And that damp patch is one of several surfaces worth knowing by name.
The Surfaces That Get Slippery First
Wet roads are not uniformly slick, and a handful of spots need extra care.
- Painted lines, crosswalks and bike-lane markings lose grip when wet. One 2025 review of skid research reports road markings averaging 15% to 20% less skid resistance than the road around them. In a Washington State University field test, riders felt safe crossing wet markings in a straight line but not when turning or braking on them, so cross upright and don’t brake or steer on the paint.
- Metal covers, grates and steel plates turn slick when wet, and so do rail and tram tracks. Ride over them upright, and cross tracks as close to a right angle as you can.
- Wet leaves. Ride around them where you can, and never brake or turn on them.
- Oil. Watch for the rainbow sheen, especially in the first rain after a dry spell. A US study of traffic crashes found the fatal crash rate rose about 3% for each 0.4 inch (1 cm) of rain when the last rain was two days earlier, and about 9% after more than 20 dry days, possibly as oil builds up on the road. The study covered all traffic, not just bikes.
- Puddles can hide potholes. Go around them when it’s safe.
- Shade. Patches under trees stay damp after the rest of the road dries.
Treat the first rain after a dry spell as the slickest.
Grip sorted. Now make sure drivers can see you.
Be Easy to See When Drivers Can’t See Much
Rain hits the driver’s view as well as your grip. Water blurs and distorts the windshield, and at night the wet road turns mirror-like, so dark shapes beside it lose contrast.
Run front and rear lights in the rain day or night, and on group rides switch to steady so you don’t dazzle the rider behind. For the group setting specifically, our flash-versus-steady guide breaks it down.
For the full visibility argument, see our visibility guide.
Lights on, even at midday.
Riding with others adds one more wet-weather courtesy.
Riding in a Wet Group: Fenders and Spray
The rider behind you knows exactly what your back wheel is serving: a steady stripe of grit and water straight at their face. Without a rear fender, that’s what you’re giving them.
Some clubs in England write it into their rules. Cambridge Cycling Club, in Cambridge, England, expects a full-length rear mudguard with a flap reaching within three or four inches (8 to 10 cm) of the ground on wet rides, and riders without one can be sent to the back.
Our version is simpler. If you don’t have a fender, ride at the back. Leave bigger gaps than in the dry, and call out paint, covers and puddles earlier than usual.
For the rest of the etiquette, our group ride rules piece has the calls and signals.
If you decide to fit a fender, our fender guide is the place to start.
No fender, ride at the back.
And sometimes the right call is to stop riding.
When to Wait It Out, Head Home or Not Go
Wet is fine. Wet plus thunder is not. A heavy downpour sits somewhere in between.
☔ It depends. If a heavy shower comes down, I’ll pull up and wait for it to pass.
The National Weather Service puts it bluntly: if you hear thunder, you’re likely within striking distance. Its outdoor lightning guidance tells people on bikes to pull over at a safe building and wait 30 minutes after the last rumble before riding on.
A substantial building or hard-topped car is safe. An open shelter or small shed is not.
If you hear thunder, get indoors and wait 30 minutes after the last rumble.
The Weather Service’s floodwater guidance warns that 6 inches (15 cm) of fast-moving floodwater can knock over an adult, and the road underneath may have collapsed. On a bike, with less grip and a lot less mass than a car, treat any moving water across the road as a hard no.
For cold days, see our cold-weather riding guide.
Before your next wet ride, knock a few psi off, test your brakes in the first hundred yards, and plan a loop with somewhere to shelter. Afterwards, give the bike some attention, and our cleaning your bike after rain guide walks through it.
Know someone who still rides like it’s dry out there? Share this with them👇
