Tire pressure: how much to inflate based on your weight and where you ride

Your tire pressure is probably the adjustment that most changes how your bike rides… and the one almost no one checks. It doesn't cost anything, you don't need any fancy tools, and, when done right, it improves grip, comfort, and even prevents punctures. Let's take a look at it without any fuss.

Why does it matter so much?

Tire pressure determines how much of the rubber touches the ground. Too much and the wheel feels stiff, bounces on every bump, loses grip in corners, and strains your wrists. Too little and the bike feels "soft," you risk pinching the inner tube against the rim (the classic "snake bite" puncture), and, with tubeless tires, the tire loses air suddenly under hard cornering. The sweet spot is somewhere in between, and it depends mostly on you.

What does it depend on?

Four things rule here:

• Your weight (you + bike + backpack). The more weight, the more pressure you need.
• Tire width. The wider the tire, the less pressure it needs. A 40mm gravel tire needs half the air of a 25mm road tire.
• The terrain. Smooth asphalt allows for more pressure; dirt, stones, and roots require less to gain grip and cushioning.
• Tubeless or inner tube. Tubeless allows you to lower the pressure without fear of pinch flats, providing more grip and comfort.

Indicative table

Starting values for a cyclist weighing approximately 70-80 kg (you + equipment). Start in the middle of the range and adjust as follows:

Mode (typical width) Indicative pressure

Road 25 mm (chamber) 6 – 7 bar (≈ 87–100 psi)

Road 28 mm (tubeless) 4.5 – 5.5 bar (≈ 65–80 psi)

Gravel 38–42 mm 2.2 – 3 bar (≈ 32–43 psi)MTB XC 2.2"1.8 – 2.2 bar (≈ 26–32 psi)

MTB trail/enduro 2.4–2.5" (tubeless)1.4 – 1.9 bar (≈ 20–27 psi)

How to fine-tune from there:

• By weight: add or subtract about 0.2 bar for every 10 kg with respect to that 75 kg reference.
• Tubeless: you can lower the pressure by 0.3–0.5 bar compared to a tube.
• Front and rear are not the same: the rear wheel carries more weight, so put 0.2–0.3 bar more than the front.

Important: Never exceed the maximum pressure printed on the sidewall of the tire. That number is a safety limit, not a target.

The summer factor

In hot weather, air expands and pressure rises on its own. On a scorching day, with the asphalt practically burning hot, you can gain 0.2–0.4 bar without even touching the tire. Two tips: inflate in the shade (not in the sun, where the tire is already hot) and, on very hot days, don't inflate the tire to the very edge of the sidewall. It's better to inflate it slightly below that.

How often to check it

Inner tubes lose air on their own: a few tenths of a bar per week for butyl tubes, and daily for latex tubes. Ideally, you should check the pressure before every ride with a pressure gauge (your fingers won't do: a tire might feel "firm" but actually be much lower than it needs). If not, check it at least once a week.

In summary

Take two minutes to properly inflate your tires before heading out, and your bike will reward you with better grip, comfort, and fewer surprises. And if you're going on a ride, make sure your tires are properly inflated: nobody wants to be the one holding up the group with a preventable puncture. Do you have your own tire pressure trick? Share it with your group on Bicicita.