What is the correct tire pressure for the road bike?

Sometimes the smallest changes make the biggest impact… The biggest performance gain you can make on your road bike isn’t lighter components or an advanced diffuser. It’s your tyre pressure. If you’re not paying attention to tyre pressure, the amount of air in your tyres is probably not ideal — and may even be seriously off. Incorrect tyre pressure can lead to punctures and reduced comfort. So read the tips below to find the perfect tyre pressure for your road bike.

Pump up your tyres

With the right tyre pressure, your bike rolls fast and smoothly, you stay comfortable, and you reduce the risk of punctures. Narrow tyres need more air pressure than wider tyres: road bike tyres usually need 5.5 to 8.5 bar.

Pssst... the word bar comes from the Greek word báros (weight). It’s a practical unit used in industry and everyday life. Fun fact: there is always pressure around us. Standard atmospheric pressure at sea level equals 1 bar.

The ideal tyre pressure depends on your weight. The heavier you are, the higher your tyre pressure should be. For example: a cyclist weighing 75 kg can use 7.5 bar on their road bike. A road cycling weighing 90 kg should be around 8.5 bar, while a rider weighing 60 kg can already ride with 6 bar. Important to note: never go above or below the tyre pressure recommended by the manufacturer. This is listed on the sidewall of the tyre.

Check your bike’s tyre pressure regularly

Tyres always lose air over time. Air slowly escapes from every tyre, no matter how good or expensive it is. This can range from a few tenths of a bar per week to a significant drop overnight. Air loss increases when the tyre is under load or when the temperature drops sharply. For every 10 °C the temperature falls, around 2% of the air disappears from the tyre. Some road cyclists check tyre pressure before every ride, others once a week. The main thing is to build a routine of regular checks that works for you. If you don’t, chances are you’ll often be riding with the wrong tyre pressure.

Did you repair your tyre during a ride with a CO2 cartridge? Then check the tyre pressure again after an hour. Carbon dioxide passes through the tyre even faster than air.

Find the right tyre pressure

Tyre pressure isn’t something you can set and forget. It’s often assumed that higher tyre pressure means lower rolling resistance, because hard tyres flex less on a smooth road surface and create a smaller contact patch. But no road is perfectly smooth. Correctly inflated bike tyres adapt to bumps and absorb shocks. Overinflated bike tyres transfer those shocks to the rider, which comes at the expense of speed and ride comfort. On fresh tarmac, your tyres may feel great at 7.5 bar, but on rough roads they may actually roll faster at 7 bar. In wet conditions, you can use 0.5 to 1 bar less than normal for better grip on the road.

Don’t overinflate

More is not always better! The general tendency is to keep increasing tyre pressure. The maximum tyre pressure printed on the sidewall is a maximum, and in most cases it’s actually too high to ride on. It also doesn’t take into account factors that affect tyre pressure, such as rider size and terrain. Especially if you’ve recently switched to wider tyres, are about to start a ride full of corners and switchbacks, or ride on surfaces like chip seal, you’ll want to lower your pressure. Although rolling resistance increases at lower tyre pressure, several studies show that the rolling resistance of different road tyres only increases slightly, by roughly a few watts of power, even at tyre pressures down to 6 bar on standard road tyres. Also keep in mind that rolling resistance is only a fraction of the forces we need to overcome (most of it is aerodynamic drag or, on climbs, gravity). The biggest differences in rolling resistance are not in tyre pressure, but in the tyre you use. Read here to learn how to choose the right tyre for your road bike.

road bike tyre pressure overview

Watch out with the floor pump

If you inflate your tyres with a floor pump, the gauge is probably not that accurate. Floor pump gauges measure pressure at the gauge itself, so they measure the air pressure in the pump, not in the tyre. And the quality of the gauge varies — it can be off by a few points. The good news is that most gauges are at least consistent, even if they’re not perfectly accurate; so at least you’re inflating to the same pressure every time. One solution is to buy a separate gauge. A dial gauge is affordable, accurate, and durable.

Experiment with different tyre pressures

It’s quite common to inflate the front and rear tyres to the same pressure. But your weight distribution is not 50% front and 50% rear. For road cyclists, in most cases it’s 40% front and 60% rear.

The pressure you prefer depends on a number of factors, such as your tyre choice and riding style, but it’s also clear that you shouldn’t run the same pressure front and rear. If you weigh 70kg with a 40-60 weight distribution, that means 42kg on the rear wheel and 28kg on the front wheel. So it makes sense to run proportionally less pressure at the front. It won’t be 50% less, but it’s not unreasonable to think it could be 15 to 20% lower.

Experiment with tyre pressure by letting around 5% out of both the front and rear tyre each time (percentage, not bar, because the front and rear tyres are different and should be adjusted proportionally). Go for a ride and pay attention to how it feels, and don’t be afraid to drop it a little more. The ideal tyre pressure gives you a comfortable ride with a confident feel through the corners. As soon as the front wheel feels even slightly unsettled in sharp turns, increase the tyre pressure again by a few percent. Measure the front and rear pressure with your gauge and note it down as your baseline, but remember that the perfect pressure can change depending on the conditions, the terrain, the weather, and if you change tyre size or brand.

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