Questions tagged [tire-pressure]

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10
votes
2answers
1k 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
97 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 ...
3
votes
4answers
314 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
51 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
1k 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 ...
7
votes
5answers
603 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
217 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
106 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
3k 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
464 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 ...
3
votes
1answer
111 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
121 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
536 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 ...
5
votes
3answers
8k 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
452 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
2k 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
2k 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 ...
38
votes
3answers
9k 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
935 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
960 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
2k 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
275 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/...
2
votes
1answer
1k 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
156 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
5k 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
6k 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
567 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
6k 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
2answers
393 views

Can I estimate tyre pressures on a road bike?

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
132 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
1k 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
2k 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 ...
3
votes
1answer
105 views

Running tires with significantly different pressures?

I ordered a replacement for one of the old Schwalbe Marathon 700x28C tires on my ancient road bike, and it turns out that "new" Marathons of that size are meant to be inflated to 80-110psi despite ...
3
votes
3answers
348 views

How do I know when it's time to pump up my tires?

I've been cycling for several months now. However, I have had the misfortune of having two bicycles stolen from me, so I've never had a single bicycle for more than a few months. With time passing, I'...
12
votes
7answers
21k views

Heavy Rider (300lb+) - Please recommend a 26" tyre to avoid tyre pinch

I ride a hybrid on 26" rims currently fitted with hybrid tires. As I am 300lbs+ the rear tire runs permanently deformed/flat and the rims ride over the rubber causing tire pinch. Can anyone ...
-1
votes
2answers
2k views

Scared of damaging bike going up and off curbs [duplicate]

Bike: Giant ATX 27.5 2 (2016) - Hardtail My current strategy to going off curbs is nose diving... I know, the best. My current strategy to going up curbs is barely lifting my front wheel onto the ...
4
votes
1answer
2k views

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 ...
2
votes
1answer
603 views

Is contact patch area governed by A=W/P

contact_patch_area = weight / tire_pressure Is this true? Wikipedia says "mostly". This guy analyzed some automobile tire manufacturer, and although the info was self-conflicting, he concludes ...
2
votes
3answers
1k views

Can I inflate to 8bar?

I am quite new in the world of urban cycling and I am liking it A LOT. for the sake of curiosity I want my wheels to be as hard as possible, know how this feels and how my bike behaves. As of now, ...
0
votes
3answers
788 views

Tire pressure on new bike

I have the new Tommaso (was Timmaso) Imola bike with Tommaso Corsa TC20 wheels. The tire sidewall says "max pressure 90 psi" The tire is the kenda 700x25c. I am 5'9" 220 used to be a power-lifter ...
1
vote
1answer
494 views

Tyre loosing air pressure despite having no puncture [duplicate]

The front tyre on my bike looses air pressure despite there being no punctures. There is no leak via the Schrader valve either. If I fill up the tyre, it looses a considerable amount of pressure by ...
0
votes
2answers
878 views

Tire pressure decrease when the bike is idle [duplicate]

I ride a Btwin MyBike 7s. Yesterday morning I noticed (for the first time since purchase) that in my rear tire, the tire pressure has decreased to a flat. I thought it was a puncture, so I refilled ...
5
votes
5answers
2k views

Why do skinny tires require less pedal effort?

Everyone knows (citation needed) that (at fixed rim diameter) tyres with smaller section require less effort to move around (at least on a paved road). TL; DR. Why? A bit of context. I always ...
0
votes
2answers
1k views

What is the correct inflation pressure for hybrid road/city bike? [duplicate]

I have a road bike and I got a flat tire probably after going back on the road from the sidewalk very carefully. I guess I pinched my tire. I usually inflate my tires to 7 bars. Is it enough and can ...
13
votes
6answers
6k views

How seriously should I take the maximum pressure rating of my cyclocross rims?

I own a very nice cyclocross bike that I use for daily commuting. It is currently fitted with relatively wide cyclocross tires (Continental Cyclocross Race 35-622) that I inflate to 4 bar (58 psi). ...
3
votes
3answers
188 views

What is the significance of tire minimum pressure?

Its quite intuitive that tires have maximum pressure figure - inflate it more and something could explode. Furthermore, it is common knowledge that under-inflated tires result in snake bites. What ...
4
votes
1answer
4k views

Inflated tire partially slipped off rim, can I fix without deflating?

There is a ~3" portion of my back tire that is no longer within the rim walls on one side. It's an older bike but in fairly good condition. The tires had just been replaced by a professional and I put ...
4
votes
3answers
2k views

What pressure should I run? Front versus the back wheel?

I assume it is common sense you should run a lower pressure in the front wheel versus the back. I weigh 175 lbs (79kg), I have tires with max 120 PSI (8.3 bar), what PSI should I run in the front and ...