Questions tagged [tire-pressure]

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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 ...
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5 votes
3 answers
375 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 ...
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6 votes
3 answers
1k 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 ...
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1 vote
3 answers
90 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 ...
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1 vote
1 answer
116 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 ...
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1 vote
2 answers
241 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 ...
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  • 143
2 votes
1 answer
92 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 ...
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7 votes
8 answers
3k 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 ...
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5 votes
4 answers
2k 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 ...
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4 votes
2 answers
233 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 ...
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  • 141
3 votes
2 answers
104 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 ...
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8 votes
1 answer
1k 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 ...
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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 ...
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0 votes
2 answers
886 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 ...
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0 votes
2 answers
398 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 ...
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4 votes
2 answers
421 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 ...
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0 votes
1 answer
157 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 ...
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3 votes
1 answer
863 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 ...
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5 votes
3 answers
2k 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 ...
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  • 156
1 vote
2 answers
1k 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 ...
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  • 113
1 vote
2 answers
112 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 ...
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  • 11
8 votes
4 answers
4k 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 ...
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  • 191
2 votes
3 answers
993 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 ...
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  • 4,841
7 votes
7 answers
4k 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 ...
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  • 4,841
11 votes
8 answers
7k 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 ...
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16 votes
8 answers
8k 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 ...
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21 votes
4 answers
6k views

Why are bicycle tires incapable of maintaining pressure over time, while car tyres seem to have less of a problem?

A typical car might have 2.5 bar tyre pressure, and use the Schrader valve system. A typical mountain bike might also have approximately the same tyre pressure, perhaps a bit more, and also use the ...
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1 vote
1 answer
106 views

Tire over inflated and went flat? [duplicate]

I thought my tire pressure was low. I pumped air to the maximum resistance and after four hour there was hissing of air continuously while I was asleep and it woke me, how can I fix it? It's a new ...
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4 votes
4 answers
1k views

Tire blowout on long descent

I was using mild braking on a very hot day, a couple miles down the hill the back tire blew out the sidewall on a Continental Ultra Sport 700x23C inflated to around 100psi. The rim was quite hot to ...
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0 votes
1 answer
156 views

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.
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5 votes
3 answers
14k views

New bike, tubeless tire will not inflate

I got a new road bike with tubeless tires. I can't get the back tire to hold air. I got the front tire inflated but for some reason, as I am pumping the air all I hear is it coming out somewhere from ...
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  • 51
8 votes
5 answers
2k views

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 ...
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  • 253
4 votes
1 answer
1k views

My new bicycle skids laterally, especially in the wet; what can I do about it?

My new bicycle is a new regular road bicycle (not specialist) with puncture tough tyres. The bicycle is fine otherwise but a bit rough on all the crappy pedestrian path elements in Japan like kerbs. ...
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3 votes
1 answer
152 views

What is the average reduction in air pressure for a mountain bike tire?

I've noticed that my mountain bike tire looses air, not because of a leak, etc., but just naturally as time progresses. Does anybody know the average psi loss over time for a mountain bike tire and ...
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6 votes
3 answers
6k views

Can I pump my MTB tire to max (55 psi / 380 kPa) without the tube inside bursting?

I have a e-mountain bike and I use to commute to uni every day. I have heard that higher tire pressures give you a bit more speed. My tires say I can pump to 55 psi (380 kPa) but I don't know if my ...
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2 votes
1 answer
3k views

My MTB tires say "Inflate to 50 PSI". Can I inflate them a little more for commuting?

I bought this MTB for commuting. Yup, I found out later that I should get a road bike instead. Too late. Not planning to use on rough terrain. Can I inflate the tires more than the manufacturer ...
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  • 123
5 votes
1 answer
347 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 ...
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4 votes
1 answer
161 views

Pressure range conflict between tire and rim

I just mounted a new Ardnet Race tire that has a side label pressure rating of 35 - 60 psi . The Stans Arch Ex rim that is mounted to says max pressure is 38 lbs, there is a little range on the ...
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  • 201
2 votes
2 answers
722 views

Time trial carbon frame scratches. Should I concern?

While cleaning my time trial bike I've noticed many scratches in the frame. See pictures below. My tire pressure is usually around 100 psi, depending on the weather conditions or circuit. My wheels ...
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  • 167
6 votes
3 answers
12k views

What pressure should a tire have?

I am a new bike rider. Over three months, my wheels are a little bit flat. However I am not too sure as to what pressure I should pump them back up to. Currently they show 25 PSI (172 kPa). It is a ...
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  • 163
0 votes
2 answers
1k views

Tires explode way under rated pressure limit

I'm restoring my dad's old Jeunet racing bike from the seventies. First thing I did was buy two new tires. The old ones looked still OK, but wanted to take no risk with 40 year old rubber. The new ...
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4 votes
2 answers
5k views

Cracks on tire - still safe to ride?

I just experienced some uncommon cracks on the tires (Schwalbe Durano Plus) The tires are pretty new (less than half year old, and used max. 1500 km). I inflated 6 bars in the tire, and according to ...
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3 votes
4 answers
5k 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 ...
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39 votes
3 answers
11k views

Why are emergency inflation cartridges filled with CO2?

Why aren't they filled with ambient air using air compressors? Isn't compressing ambient air cheaper than generating CO2? If it is, then those cartridges would have two benefits: Cheaper to ...
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  • 567
2 votes
1 answer
2k views

Using compressor gauge to determine tyre pressure?

I own one of these "pistols" used with compressors, but have no idea on how to use them to determine the pressure inside my (tubeless) tyre. When I inflate my tyre the values on the gauge get ...
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2 votes
1 answer
2k views

Sudden loss of air on tubless tyre, and now it won't inflate

Finding bike answers on the internet is really hard when you have no idea what you're looking for, so I'm sorry if I'm asking a ridiculous question here. Cycling back today I went over a bump in the ...
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  • 123
2 votes
3 answers
5k views

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 ...
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  • 197
0 votes
2 answers
774 views

Increasing speed and reducing effort on steel MTB on the road [duplicate]

I have a low end steel MTB, which is heavy by itself, and I also a heavy man weighting in at 100kg, and on my MTB I have knobby dirt tires. As you can imagine, riding on the road any faster than 20km/...
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  • 111
0 votes
2 answers
3k 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.
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  • 1,146
3 votes
1 answer
177 views

Massive loss of pressure in my front tire but it still holds air

Last night I was riding into a parking garage with a steep decline before the entrance. I hit the bottom of the ramp hard and lost most of the tire pressure in my front tire in a split second. I ...
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