# Best answer: How do you know how much air to put in bike tires?

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Look on the sidewall of your bike tire and find the recommended PSI (pounds per square inch). This will vary based on the bike and the tire size. Sometimes this is given in a range such as 35-65 psi on a mountain bike. Or it might give a maximum such as 120 psi on a road bike.

## How do I know what PSI my bike tires should be?

Once you know the psi range, use your tire gauge by placing it on the valve and pressing down, causing the needle on the gauge to move and display the pressure. Alternate between the air pump and gauge until you reach desired pressure. To make things easier, get a pump with a built in gauge.

## How much air do you put in bike tires?

Proper tire pressure lets your bike roll quickly, ride smoothly, and avoid flats. Narrow tires need more air pressure than wide ones: Road tires typically require 80 to 130 psi (pounds per square inch); mountain tires, 25 to 35 psi; and hybrid tires, 40 to 70 psi.

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## How do I know if my bike tire has enough air?

If you see the bottom of the wheel as cutting in to the side of the tire, then the pressure is definitely too low. Simple answer is, they always need more air. Tires leak, slowly, but they all leak. If you are riding every day, you probably want to top them up every 2-3 days.

## What happens if you put too much air in your bike tires?

The higher pressure makes the bike feel fast but may actually be slowing you down! If the tire is too hard it will have a tendency to vibrate and bounce which increases rolling resistance and makes for an uncomfortable ride.

## Is 40 psi good tire pressure?

1. What’s The Recommended Tire Pressure For My Car? … Normal tire pressure is usually between 32~40 psi(pounds per square inch) when they are cold. So make sure you check your tire pressure after a long stay and usually, you can do it in the early morning.

## Is 80 psi too high for tires?

The 80 psi is required if the tire is operating at rated load. You most likely have a load range E tire. I have run load range E tires for years on my 4 Runners at 32 psi front and 30 psi rear. This gives me real even tire wear.

## What the lowest tire pressure you can drive on?

If you have standard passenger tires (ninety percent of vehicles do) the lowest tire pressure you can generally drive with is 20 pounds per square inch (PSI). Anything under 20 PSI is considered a flat tire, and puts you at risk for a potentially devastating blowout.

## Is it normal for bike tires to lose air?

Regularly pump up your tires. A perfectly functioning tire will loose air over time. For starters, you should know that a normal, brand-new tire and tube will loose air over time. … As a guideline, a typical skinny road bike tire (700x23c) can lose half of its pressure in two days.

## Can I put air in my bike tires at a gas station?

In most cases, no. The long answer: The reason you can sometimes use an automotive air-pump on a bicycle tire/tube is because they share an identical valve. … Therefore, it is much easier to over-inflate and even blow out your bicycle tire, if you were to use one.

## Why do bike tires go flat when not in use?

Bike tires go flat when they sit for a long period of time because at a molecular level, stuff is fairly porous. … So the air molecules are always seeping out of the tire through the rubber. Ultimately, the air pressure in the tire will equalize with the atmospheric pressure. It may take a while, but it will happen.

## Why do my bike tires look flat when riding?

Running a low pressure, you risk what’s called a “snakebite” or pinch-flat. The walls of the rim pinch the tube between the bead seat (the hook part of the rim the tire latches on) and the inner casing of the tire as it flattens out.

## Is 35 psi too high?

Higher pressure generally is not dangerous, as long as you stay well below the “maximum inflation pressure.” That number is listed on each sidewall, and is much higher than your “recommended tire pressure” of 33 psi, Gary. So, in your case, I’d recommend that you put 35 or 36 psi in the tires and just leave it there.

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## Is 50 psi too much for tires?

Every tire has a rated maximum inflation pressure. Often it will be found in small print around the rim edge of the sidewall. … This means that the tire will safely carry up to 1477 lbs. and can be safely inflated up to 300 kPa (Kilopascal) or 50 psi (pounds per square inch).

## Why do dealers overinflate tires?

Did you check the pressure after driving the car while tires were warm or did you check pressure first thing in morning when tires are cold? Tires are overinflated during the shipping process, so as to help prevent the flat spot from forming in the tire as it sits for days on in during the shipping process.