Questions tagged [tire-pressure]

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2
votes
2answers
85 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 ...
7
votes
1answer
949 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
4answers
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
2answers
147 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 ...
0
votes
2answers
151 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 ...
3
votes
0answers
160 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 ...
0
votes
1answer
128 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
1answer
785 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
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3answers
771 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
2answers
103 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
2answers
62 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
4answers
3k 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
3answers
282 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 ...
4
votes
4answers
1k 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 ...
10
votes
8answers
6k 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 ...
14
votes
8answers
7k 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 ...
21
votes
4answers
5k 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 ...
1
vote
1answer
104 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 ...
4
votes
4answers
846 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 ...
0
votes
1answer
91 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.
3
votes
3answers
6k 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 ...
8
votes
5answers
1k 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 ...
4
votes
1answer
361 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. ...
3
votes
1answer
118 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 ...
6
votes
3answers
4k 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 ...
2
votes
1answer
1k 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 ...
5
votes
1answer
183 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
1answer
131 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 ...
2
votes
2answers
621 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 ...
6
votes
3answers
11k 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 ...
0
votes
2answers
800 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 ...
4
votes
2answers
4k 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 ...
3
votes
4answers
4k 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 ...
39
votes
3answers
10k 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 ...
2
votes
1answer
1k 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 ...
2
votes
1answer
1k 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 ...
2
votes
3answers
4k 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 ...
0
votes
2answers
513 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/...
0
votes
2answers
2k 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.
3
votes
1answer
165 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 ...
6
votes
3answers
1k views

Does a fat tire ride softer than a skinny one at the same pressure?

Fat tires are associated with good bump absorption. Is this due to their fatness, or is it due to the low pressure with which they can be used? If I pump a fatbike tire to 120 psi (yes, that would be ...
4
votes
5answers
7k 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
4answers
11k views

There is a grinding feeling at the end of my pedaling at high speed

I bought a road bike about 6 weeks ago, but I just only realised it now that at the end of my pedaling (when either foot pushes down), I can feel a bit of a drag/friction/grinding on either pedal. I ...
1
vote
2answers
724 views

Compatibility of pressure gauge with valve

I have a tube with schrader valve, for which I want to buy a pressure gauge. Is there a specific type of nozzle for different types of valves? How many types of such nozzles are available for ...
2
votes
6answers
10k views

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 ...
3
votes
3answers
510 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.
5
votes
2answers
2k views

Rode on a flat tire - how do I check for possible damage?

Took quite a fall today while riding, big divot in a gravel path right over the peak of a small hill. After replacing the chain and doing a quick inspection, I resumed the 10 mile trip to the car. I ...
1
vote
2answers
177 views

Slow leak that fixed itself?

I noticed that my back tyre was losing pressure -- on the order of 70 psi down to under 30 psi in three days. (I pumped it up and left the bike alone for those three days.) I thought it had a small ...
3
votes
1answer
2k views

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 ...
7
votes
2answers
3k views

What to check after blowing tire off rim

Recently, after mis-reading "35-65 PSI" on a tire sidewall as "35-85 PSI" (in retrospect the unusually huge range should have tipped me off), I inflated a tire rated for 65PSI max to 80PSI. A few ...