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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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5 votes
3 answers
4k views

Is bike tyre pressure info deliberately hard to read?

Inflation pressures for tubes are typically written on the side wall of tyres. I tend to use my tyres till they are very worn and tube starts to bulge through a tiny bit. Most of the time I spot this ...
12 votes
4 answers
3k views

Is rolling resistance that significant?

How significant is rolling resistance? I switched the tires on my bike back in March and ever since then, I've noticed that I've lost about 2 mph (3 km/h) on average. I just feel slow and notice that ...
5 votes
6 answers
7k views

Why did both of my inner tubes blow out on a new bike I've only put 4 hours on?

I bought a new Diamondback Trace hybrid bike about a month ago. Rode it twice for about an hour a piece and the last time for about two hours. I had no problems any of the times and inflated the tires ...
7 votes
5 answers
2k views

The tire of my bicycle flattens within a week

I bought a used bicycle; it is all fine but one problem that I am having is that its front tire always flattens in about 5 or 7 days after I put air in it. I don't know what's causing this. Is there a ...
-1 votes
1 answer
50 views

I can’t unscrew the rear tire dust cap and when I pump it not all the air from the pump goes in

It is a Kent Ambush FS20 bike. Blue. Pretty Old around 5-7 years old. From https://www.walmart.com/ip/Kent-Bicycles-20-Boy-s-Ambush-BMX-Child-Bike-Black-Blue/36877058
5 votes
3 answers
2k views

Towing children and rear tire

Today I used a trailer and towed my daughters in our first bike ride together. We were about five miles out when my rear tire went completely flat. I used the bike a few days prior without the trailer ...
9 votes
5 answers
2k views

What are the drawbacks of having wider tires on endurance road bikes, as they may offer the same rolling resistance with lower pressure/more comfort?

It is often stated that wider (performance) tires offer less rolling resistance at the same pressure (or less pressure at the same rolling resistance, which is beneficial for comfort). The well known ...
4 votes
1 answer
546 views

Tire flat after 2nd trip on Brand New Ancheer 500W Ebike

Ok, so I am new to biking and don't know squat, as you will soon see. I bought a brand new E-bike, an Ancheer 500W. I borrowed an air pump, but had no pressure gauge when I first aired up the tires... ...
3 votes
2 answers
2k views

Can I change my 29x2.25 MTB tyres to a 29x2.35 tyre without changing anything else? [duplicate]

I am a large guy, nearly 2 metres (78 inches) tall and weigh about 160kg (350 pounds). I am aware that bikes are not really made with me in mind and that my best bet is to have new wheels custom built ...
4 votes
2 answers
361 views

Does low tire pressure affect safe, minimum tire clearance?

Will running a tire at the minimum recommended pressure increase the safe, minimum tire clearance? If I switch to the tire width I have in mind, I will have slightly more than 3mm of clearance. This ...
2 votes
5 answers
2k views

Optimal front / rear weight ratio

What is your preferred weight ratio between front to rear wheels on your bike(s)? I always assumed 40% front / 60% rear was "normal". I have been experimenting with tire pressure and stem ...
6 votes
3 answers
2k views

What happens if a tubeless tyre is overinflated?

The gravelking SK has a max tubeless pressure of 60 psi. What happens if you inflate it more, to say 100?
12 votes
8 answers
4k views

Why are mountain bike tires rated for so much lower pressure than road bikes?

Road bikes with their sleek, thin and flimsy looking tires are designed to take extremely high pressures, going up to 130 PSI (900 kPa). Mountain bikes have much more solid looking, broader tires. And ...
3 votes
3 answers
2k views

What should my rear and front tire pressures be if they have wildly different recommended pressure ranges?

I ride a gravel bike and decided to upgrade my rear tire to a new semi-slick one so I can be a bit faster (Innova Pro Stampede -> Maxxis Receptor). The problem is though that the Maxxis Receptor ...
10 votes
5 answers
2k views

Why don't my studded tyres grip on ice?

For the first time in my life, I have had stud tyres installed on my bicycle, because I've nearly killed myself bicycling the last few winters, no matter how slowly and carefully I go. It seems like ...
5 votes
7 answers
14k views

How much air loss over time is considered normal / acceptable for a hybrid tire?

I'm looking for a rule of thumb as to how much air loss over time is considered acceptable / normal for a hybrid tire. Surprisingly I have not been able to find much on this upon Googling. In this ...
2 votes
2 answers
2k views

Vittoria Barzo / Mezcal Minimum pressure

Just mounted Mezcal (2.25) and Barzo (2.35) on a i29 rim, tubeless. Then I read the sign on both tyres that says Minimum pressure tubeless 2.00 bar. Ideally I would go for a 1.1 front 1.2 back but I’m ...
5 votes
4 answers
8k views

Anything wrong with 100 PSI in 700x32 tires on a road bike?

Independent of the manufacturer of my new road bike, I wanted to ask if I am overkilling the purpose or intent of 700x32 tires by using 100 PSI. The air volume is greater for 700x32, so I believe the ...
0 votes
0 answers
200 views

Tire and tube keep popping off of the rim

It's the third time now that the tire just pops off my rim, and then the tube blows up as a result. This is all within the span of six months on a brand new bike assembled by a supposedly high-end ...
2 votes
4 answers
2k views

Should I inflate MTB tires to 50 PSI?

I'm 5'10" 95kgs. I use an MTB for city commute (I know I should've gone with a hybrid instead). The tires recommend a max pressure of 50 PSI. I'm wondering if setting the rear tire at 50 PSI ...
9 votes
4 answers
1k views

Letting air out of tires in the rain: any chance of water getting in? (Presta valve, tubeless tires)

I grant this is probably a silly question, but one never knows... I was out riding and rain arrived earlier than expected. I had inflated my tires before setting out to a pretty high pressure for my ...
3 votes
1 answer
482 views

Tyre pressure aero wheel

I don’t know what to do in this situation with my road bike. My aero wheel say max 103 psi on it but my tyre range say 115-145 psi. I weigh 180 lbs. Do I inflate them to 100 psi or 115?
7 votes
7 answers
7k views

Is a powered car tire inflator suitable for road bike tire inflation?

I'm switching to road cycling. My diminutive and portable pump will likely be a pain to get 120psi. Rather than get a foot pump with either a built-in or an external pressure gauge, I'm thinking of ...
2 votes
1 answer
281 views

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 ...
5 votes
3 answers
664 views

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 ...
6 votes
3 answers
5k views

Tyre Pressure for heavy rider - any concerns?

Currently weighing 125 kg, I got myself a BMC Alpenchallenge One to finally start exercising and lose weight. The bike is equipped with Continental Contact Speed tyres (700x35c). Maximum pressure is ...
1 vote
3 answers
116 views

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 ...
17 votes
8 answers
9k views

Can I avoid falling in the rain on a corner?

I was riding in the rain a few months ago and fell turning a 90° corner. Here are the details: Riding on a road bike with new 25mm smooth tires inflated to 100 psi (Cannondale Synapse with ...
1 vote
1 answer
310 views

Air Compressors never have air pressure gauges here so what is the easiest way to achieve a certain tire pressure?

I just checked a high end bicycle shop and it doesn't have air pressure gauge on the air compressor outlet( or anywhere) and the local shop doesn't have one at the end of long outside one- it is ...
4 votes
2 answers
670 views

Tires not holding air at high pressure

I ride a Trek road bike with 25c tires. The recommended pressure on the tire is 100-130 psi. Before I ride I inflate the tires to close to the max pressure no problem and my pump works fine. But ...
1 vote
2 answers
269 views

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 ...
2 votes
1 answer
694 views

Does the safe pressure of tubeless tire change with a tube?

I have a brand new Goodyear Vector 700x28c Tubeless Complete tire and the max PSI written on the sidewall is 85 but the non-tubeless 28c version is 110 PSI. My question is can I pump my tubeless tire ...
7 votes
8 answers
6k views

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 ...
5 votes
4 answers
4k views

How easy is it to explode a tubeless tire whilst seating, and how do I avoid this?

I installed tubeless tires about two months ago, but the back tire had been leaking fluid and yesterday went completely flat. All the fluid inside has dried up and a lot of it had built up between the ...
4 votes
2 answers
917 views

Bike tires only inflate up to 30psi with foot pump

My bike has sat over the winter, and the tires went flat. I used my foot pump to inflate the tires (front and back) and both tires inflated to 30 psi. I have shraeder valves. The pump continued to ...
5 votes
1 answer
521 views

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 ...
3 votes
2 answers
162 views

What is making my tire squeak without riding it?

I have a Skullbone (HBB) bike. I aired up my tires and now it’s making this squeaking noise when I turn the wheel right to left (not when riding it). I’ve never had this problem before. I aired the ...
3 votes
3 answers
798 views

Can I estimate tyre pressures on a road bike? [duplicate]

Can I estimate my road bike tyre pressures by pressing my thumb into the tyre? I don't have a tyre pressure gauge, and feel that the tyres on my new Merida Scultura are pumped too hard.
8 votes
1 answer
2k views

Does tire pressure affect rolling resistance on pavement?

It's a no brainer, right? Yet a comment links to a blog post claiming to have scientifically proven there is no significant effect. It looks solid but is not a paper in a peer-reviewed journal. What ...
7 votes
4 answers
1k views

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 ...
0 votes
2 answers
1k views

Why does front wheel keep more air pressure then rear wheel over time? [duplicate]

After pumping both the tires equally, after a few weeks pass, the rear tire of my bicycle keeps on getting flatter day by day, and looses pressure. I have checked everything and there is no leakage ...
0 votes
1 answer
262 views

Alwasy getting a flat rear tire on my 14"inch folding bike

I just bought my 14" folding bike and I always getting a flat tire on the rear. It happened 4 times in a span of three days. 1st flat was with the stock inner tube, 2nd flat is with the new inner ...
3 votes
1 answer
941 views

Mountain bike tyres unreliably lose and keep pressure?

I have a old mountain bike (10 years old) and for most of it's life it's sat in the shed (being ridden lightly maybe once or twice a year), only recently have I tried riding it regularly for the first ...
5 votes
3 answers
5k views

Tire pressure with latex tubes: higher, lower, the same?

I have just mounted a set of latex tubes to try it out - inside a set of s-work turbo cotton 26 mm on a regular roady. You notice the difference immediately. The feel is just very different. In ...
1 vote
2 answers
5k views

Proper tire pressure for my bike?

I wanted to ask about proper tire pressure specifically for the bike I got. The model is Oryx Volt 26". Tires specs are: 26" / 2.125". I believe Toronto Police used such bikes. Recommended pressure ...
1 vote
2 answers
143 views

Pump/PSI issues

Good afternoon I have recently bought/installed new inner tubes and tyres (26" x 1.95") for my bike as attached (https://www.vandorm.co.uk/collections/26/products/vandorm-26-schrader-valve-inner-tube ...
8 votes
4 answers
6k views

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 ...
2 votes
3 answers
1k views

Usefulness of high-pressure/high-volume switch on a track pump

Among the track pumps (floor pumps) on the market, I see one advertised with the following feature: foot-activated high-pressure/high-volume switch I'm interpreting this to mean that the pump has ...
0 votes
2 answers
4k views

Are there measurements of road bike tire friction coefficients?

I am trying to learn about the maxium lean angle of a road bike. I'm looking for measurements and comparisons.
11 votes
8 answers
8k views

Low tire pressure causing fall in corner?

I recently fell in a corner. My front wheel lost traction (slid out from underneath the bike, what they call a 'lowsider' in motorcycling iirc). I was running quite low tire pressure (front wheel) to ...