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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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39 votes
3 answers
13k 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 ...
Tooniis's user avatar
  • 577
21 votes
4 answers
7k 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 ...
AlphaCentauri's user avatar
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 ...
Chris Schiffhauer's user avatar
14 votes
6 answers
11k 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). ...
Emil's user avatar
  • 400
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 ...
John Doe's user avatar
  • 475
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 ...
Rohit Pandey's user avatar
12 votes
7 answers
45k 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 ...
Matt TC's user avatar
  • 121
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 ...
Maarten -Monica for president's user avatar
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 ...
Dren's user avatar
  • 117
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 ...
Cerulean's user avatar
  • 1,061
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 ...
Rеnаud's user avatar
  • 21k
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 ...
jrcollins's user avatar
  • 191
8 votes
5 answers
3k 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 ...
plu's user avatar
  • 253
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 ...
Vorac's user avatar
  • 13.8k
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 ...
Szabolcs's user avatar
  • 996
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 ...
Ogman's user avatar
  • 71
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 ...
Sam7919's user avatar
  • 9,268
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 ...
Alexander Tsepkov's user avatar
7 votes
2 answers
5k 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 ...
SSilk's user avatar
  • 4,249
6 votes
3 answers
7k 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 ...
Sonasi's user avatar
  • 61
6 votes
3 answers
14k 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 ...
Quillion's user avatar
  • 163
6 votes
5 answers
3k 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 ...
astabada's user avatar
  • 496
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 ...
JZ9294's user avatar
  • 61
6 votes
3 answers
2k 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 ...
BSO rider's user avatar
  • 5,735
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?
Ne Mo's user avatar
  • 1,405
6 votes
1 answer
5k views

What kind of portable pump should I carry when riding on a fat bike?

However, I just got a fat bike with 4.5in tires. I know that my portable hand pump takes a long time to pump mountain bike tires due to it being optimized for high pressure / low volume. What type of ...
Benzo's user avatar
  • 18.2k
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 ...
kabdulla's user avatar
  • 375
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 ...
wjktrs's user avatar
  • 597
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 ...
Hello World's user avatar
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 ...
Jensen's user avatar
  • 176
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 ...
cdahms's user avatar
  • 887
5 votes
3 answers
4k 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'...
einpoklum's user avatar
  • 819
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 ...
user74858's user avatar
5 votes
3 answers
666 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 ...
uUnwY's user avatar
  • 2,238
5 votes
3 answers
21k 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 ...
Rose's user avatar
  • 51
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 ...
user avatar
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 ...
phyrexia19's user avatar
5 votes
2 answers
4k 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 ...
Mike S's user avatar
  • 51
5 votes
4 answers
2k 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 ...
batflaps's user avatar
  • 471
5 votes
2 answers
4k views

Does high PSI or low PSI affect the life of a tire?

Is there a method to tell the life of a tire? How can you tell if a tire is going to wear down faster than another tire? I assume puncture resistant tires wear out slowly, but I'm really curious ...
leaflifelayf's user avatar
5 votes
1 answer
4k views

Is the max pressure on tubeless rims specifically for tubeless, or do they apply to tubed tires too?

I have a set of ZTR Rapid rims that are tubeless compatible, but I never run tubeless tires on them. They have this list of maximum pressures on the side of the rim: Since the limits are dependent on ...
jimchristie's user avatar
  • 11.9k
4 votes
2 answers
366 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 ...
Peachy's user avatar
  • 125
4 votes
2 answers
7k 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 ...
clementino's user avatar
4 votes
1 answer
13k 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 ...
quinlanofcork's user avatar
4 votes
2 answers
923 views

Lower tire pressure on wider rims?

For a given tire width, can you safely run a lower pressure on wider rims? Background: My road bike can only fit up to 23 mm tires due to frame clearance, however my rims are a relatively wide 23 mm....
user1938415's user avatar
4 votes
1 answer
550 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... ...
Keith's user avatar
  • 41
4 votes
2 answers
12k views

Relatively new tube exploded by itself without any external force

This morning I heard the tube in the rear tire explode (I never heard a tube explode before. It was quite loud). I hope someone can shed some light on why this may have happened (and how to prevent it)...
netal's user avatar
  • 43
4 votes
2 answers
3k views

Cyclocross Tire Pressure

I have never raced before but there is a cycloycross race a mile from my house this weekend. Course has a fast bumpy downhill. On my mountain bike with fixed carbon fork and tubeless at 40 PSI ...
paparazzo's user avatar
  • 15.7k
4 votes
1 answer
203 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 ...
gyoung1986's user avatar
4 votes
4 answers
19k 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 ...
chaser's user avatar
  • 141