Bicycles Stack Exchange
Bicycles Stack Exchange

Questions tagged [tire-pressure]

Correct tire pressure is important for comfortable and safe riding. Use this tag for questions about how to choose and maintain optimal tire pressure in general or in specific cases.

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How can I inflate a tire to the correct pressure?

I have a 700 x 38c tire with a Schrader valve I just did a puncture repair on. The recommended pressure for the tire is 75-100 psi (520-690 kPa). I would normally just inflate the tire until it felt about right, but since I had recently purchased a…
jrcollins
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Is there a way to calculate the correct bicycle tire pressure?

I have 57-559 (57 mm width, 559 mm diameter) / 26"x2.125" tires. I weigh about 95 kg / 210 lbs. The tire's sidewall shows a single pressure value of 300 kPa / 43 psi. However, this calculator shows that given a fixed tire size, different rider +…
plu
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Consequences of having too low tyre pressure

I changed a 38-622 size tyre to a different brand 37-622 one. The original tyre stated a pressure range of 40-60 psi, while the new one states 50-85 psi. What are the consequences of going below the recommended lower limit (50)? The bicycle is used…
Szabolcs
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Is there a way to measure tire pressure without using the valve?

I'm trying to DIY a sort of a "smart rack" for a bike that can alarm me of problems like low tire pressure. Problem is that tire pressure is measured via the valve, which isn't a practical solution for this use case. Is there is a way to arrive at a…
Alexander Tsepkov
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Are there other methods for measuring tire pressure besides a pressure gauge?

Slightly awkward question... A pressure gauge is good and useful, especially having a pump with a gauge, but some air escapes at each measurement, so I wonder if there are other methods that give reasonably good estimate. The reason for asking is…
Stephan Matthiesen
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How to determine the minimum tire pressure if the manufacturer does not?

Some tires only have the maximum pressure written on them, stating nothing about the minimum. For soft and comfortable rides, the recommendation is to inflate them to lower pressures, but then how to avoid under-inflation? Should we just not…
user39828
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How does my tire pressure effect the tire's maximum load?

So, I've very recently bought a brand new "Radius Targa"... The pressure I'm told to inflate my tires to (which it says on the side of the wheel) is 50 PSI, the only measurements I can find on the wheel to tell me anything about size or whatever is…
Azi9
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Can I under inflate bike tires to reach a 15 percent drop?

The recommended tire pressure is when the tire's height drops by 15% when it's loaded because it makes the ride comfortable without increasing the tire's rolling resistance too much. Less bumpy rides mean the tires may even roll faster.…
Brian
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Does anybody has a chart or table of the rolling resistance vs tire pressure for a MTB tire?

I read lots of education around how the high pressure for a MTB tire is bad and how the low pressure is very good for the rolling resistance. I feel puzzled by these talks because they seem contradicting my experience. From the other side, I have…
nightrider
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What is the maximum tire pressure?

I have a Trek FX3 with Bontrager AW1 Hard-Case Lite, 700x32c and I would like to know what the maximum tire pressure is? The reason I ask is when riding at higher speeds and turning it feels like the back tire is going to come off. I found this…
bated
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Can't get over 50psi in bike wheel

I've just replaced my mountain bike tyres/tubes with new 26x1.50 city slicks. Max psi is 80 but my foot pump won't push more than 50 in. Is this because it's a schrader valve, or do you think my foot pump is past it. If it's the valve type is there…
Martin
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How to choose an tire pressure gauge online?

Bicycle shops of any grade in Japan don't carry tire pressure gauges- hardware shops tell you to look their mall bicycle shop. Tire pressure gauges on pumps don't exist. So I have pick one to buy on online. How to choose one? What should be my…
user2617804
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Why do high pressure tires feel faster?

In the last decade, people have been saying that high pressure tires don’t actually make you faster. My takeaway from what Jan Heine says on Bicycles Quarterly: either there is suspension loss in the tire or in your body, so there’s suspension loss…
meedstrom
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Araya 27 1 1/4 rim and tire, max pressure

I've just bought new tire (deli tires 145) for my old vintage ARAYA rim (27 1 1/4). Tire is the same size but I don't know which max pressure I can put in them, tire says min 73 PSI.
Nikita
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