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How much tire pressure?

Old 04-14-24, 12:43 PM
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How much tire pressure?


If find this too much. Am I misanthropomorphizing my bikes?

I think we like a more comfy ride plus I have this fear it'll explode in my face cuz I put it on wrong or like when one of my coconuts fell on my head it just wasn't my day.
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Old 04-14-24, 12:49 PM
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Elephant in the room is that ai has succeeded in killing googleís search function, and youíre getting ai bs as the ďsuggested answerĒ or whatever itís called to your search query.

Tire pressure is dependent on tire width and rider weight, just use your thumb to get a feel. itís been discussed to death on the interwebs, if you want a number.

wearing eye protection or even ear protection is not a bad idea. Also, letís say you want to go to 100, if you want to be careful go 20 at a time and then inspect the bead on the tire to make sure all looks good. If it looks perfect at 60, itís probably going to be fine.

darn ai ruining the internet. Kids bikes lol.
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Old 04-14-24, 12:54 PM
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Thanks. I think more is better in most cases aside from off road is my impression. Didn't I read it's safer for your tires too as far as ease of puncture?
​​​​​​
Side question: you use the green stuff? I get the cheapest tubes cuz they all die soon enough anyway and fill em all with the slime and it adds a lot of life to them.
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Old 04-14-24, 12:59 PM
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Originally Posted by juntjoo
Thanks. I think more is better in most cases aside from off road is my impression. Didn't I read it's safer for your tires too as far as ease of puncture?
​​​​​​
Side question: you use the green stuff? I get the cheapest tubes cuz they all die soon enough anyway and fill em all with the slime and it adds a lot of life to them.
I donít use the slime, never tried it, seems messy but itís sold for a reason so it must workÖ

Higher pressures are safer for punctures, because too low of a pressure can lead to ďpinch flats.Ē Say you hit a pothole, the tire gets pushed in at that point and if itís not inflated enough the inner tube can actually get pinched on the rim. It looks like a snakebite, 2 holes the width of the rim apart from each other. As long as youíre inflated beyond the point where you wonít pinch flat, higher pressures donít help with puncture resistance, but that point can rise if you suddenly have to hit a pothole or something or hit it at a faster than expected speed.

my rule of thumb is road bikes 80-110, normal mountain bikes 60, hybrids somewhere in between. Mountain bikes with really wide wheels go lower, I donít ride off-road much though. It says the recommended tire pressure range on the tire. I normally go with the top end suggested and multiplying it by 1.25 as the pressure I run, but Iím fat and fast, lots of forces to aid in pinch flats.

Last edited by LarrySellerz; 04-14-24 at 01:03 PM.
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Old 04-14-24, 01:04 PM
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What are you asking? If you expect there to be one perfect answer, then just make one up and that can be it.

Many times the only pressure they show on the side of the tire is the maximum tire pressure you should ever inflate it to when riding.

The pressure you should put in your tires is less than the max and more than any minimum they list. Regardless of the minimum, it should at least be enough that you don't get any pinch flats. Then from there until you hit the max recommended, it's what ever you find you prefer, whether that number comes from a calculator for tire pressure, or your own personal feeling of what is right for you.
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Old 04-14-24, 01:05 PM
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Originally Posted by LarrySellerz
I donít use the slime, never tried it, seems messy but itís sold for a reason so it must workÖ

Higher pressures are safer for punctures, because too low of a pressure can lead to ďpinch flats.Ē Say you hit a pothole, the tire gets pushed in at that point and if itís not inflated enough the inner tube can actually get pinched on the rim. It looks like a snakebite, 2 holes the width of the rim apart from each other. As long as youíre inflated beyond the point where you wonít pinch flat, higher pressures donít help with puncture resistance, but that point can rise if you suddenly have to hit a pothole or something or hit it at a faster than expected speed.

Thanks! That's good new info for me. I know I prefer my punctures on the outer side of the tube so the slime will hit it but sometimes they're inside the tube too which I guess is due to either general wear at the weakest point or some gravel or something in there so now I try to remember to clean it up in there before installing. So I'll now look out for that snake bite. I do tend to hit holes and curbs I miss with my near sight
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Old 04-14-24, 01:12 PM
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Check the tire manufacturer website.
Schwalbe, for example, gives a range that I found helpful.
I adjust according to the type of road surface, firmness of my ride sought and weight f/r?
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Old 04-14-24, 01:35 PM
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I like this pressure calculator, silca has one also https://www.renehersecycles.com/tire...re-calculator/

IME getting quality tubes reduces the flats i have. I tried slime years ago and it never worked

I have used Caffelatex with some success.

IME sealant works best at lower tire pressures.... high pressure just blows it out too fast for it to work
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Old 04-14-24, 03:09 PM
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If the tire feels like it's rolling slow and flops/feels squishy in corners add more air. If it feels like it's pinging you around like a ping pong ball you can try lowering it.
The heavier you are the closer to max or higher on the pressure range you should run. Or if you ride hard. It's best to own a hand pump for when you get a flat, but also so you can test air pressure mid trail/ride.
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Old 04-14-24, 03:16 PM
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Originally Posted by juntjoo

If find this too much. Am I misanthropomorphizing my bikes?

I think we like a more comfy ride plus I have this fear it'll explode in my face cuz I put it on wrong or like when one of my coconuts fell on my head it just wasn't my day.
When you see a tire pressure recommendation on the side of a tire, it's to keep the manufacturer from bring sued
When you see a tire pressure recommendation on a cycling website, it's very general to cover every situation and possibility

So what to do?
Fill your tire mid range on the side of the tire. Does it say 30-50? Then go 40
Is the total weight of rider and cargo higher, might consider going 5-10psi higher.

Bottoming out? add 5 psi
Harsh ride? remove 5 psi
Repeat until you're happy.

Getting the EXACT psi from google or even here is a fool's errand.

Ball park it, adjust as necessary.
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Old 04-14-24, 03:33 PM
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https://axs.sram.com/guides/tire/pressure

this is the website I use, and I may adjust a couple of pounds either way, but it typically gets me pretty close.
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Old 04-14-24, 04:45 PM
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My weight is about 155/160 LBs. Long ago my bike shop recommended 100 PSI per tire on my road bike. Tire size 700x25. Seems to have worked well.
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Old 04-14-24, 05:46 PM
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My two pieces of advice: 1) Squeeze the tire with your fingers regularly so you come to know what the right pressure for you feels like. The time will come when the only inflation device around has no gauge. With educated fingers, no big deal.

2) Run front tires around 5 psi less than the rear. Various "exact" sources will tell you to go a lot lower for optimum comfort and rolling resistance for the weight you place on the front tire; usually considerably less than you have in back. But - should you ever find yourself behind a rapidly slowing car, truck or even another rider, braking hard 'cause you have no choice and a p0othole or rock appears from under that vehicle or rider. Suddenly, that almost rear tire pressure will look like a G**send!

This 5 psi less in front was routine advice from veteran bike racers to newbies when I started racing 50 years ago. Been doing that (with a gauge or by feel) the whole time and have never regretted it.
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Old 04-14-24, 06:02 PM
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The Silca calculator has worked great for me.
At 165-170 lbs, I run 70-72 psi on my 28mm Continental tires. That's great on rough roads, and enough pressure for quick steering.

Originally Posted by WaveyGravey
My weight is about 155/160 LBs. Long ago my bike shop recommended 100 PSI per tire on my road bike. Tire size 700x25. Seems to have worked well.
Silca recommends 80 front, 82 rear for poor pavement and moderate speeds. That sounds right. Try dropping 5 or 10 psi and try the ride, so you get used to the better tire pressure feel. Repeat to the target range and see how that works. Cracks, tar strips, patched and worn pavement will be considerably improved.
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Old 04-14-24, 06:03 PM
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I think there is an optimal range of tire pressure for each of these:

1. Rolling resistance
2. Comfort on different surfaces
3. Flat resistance
4. Cornering and braking traction

Personally, I only worry about #1 and let the rest take care of themselves.
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Old 04-14-24, 06:04 PM
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Originally Posted by 79pmooney

2) Run front tires around 5 psi less than the rear. Various "exact" sources will tell you to go a lot lower for optimum comfort and rolling resistance for the weight you place on the front tire; usually considerably less than you have in back. But - should you ever find yourself behind a rapidly slowing car, truck or even another rider, braking hard 'cause you have no choice and a p0othole or rock appears from under that vehicle or rider. Suddenly, that almost rear tire pressure will look like a G**send!

This 5 psi less in front was routine advice from veteran bike racers to newbies when I started racing 50 years ago. Been doing that (with a gauge or by feel) the whole time and have never regretted it.
Modern pressure calculators like SRAM and Silca also advise running approx 5 psi less front pressure.
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Old 04-14-24, 07:39 PM
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Gotta love Schwalbe balloon tyres.

30 psi for low rolling resistance

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Old 04-15-24, 09:29 AM
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Originally Posted by juntjoo
If find this too much. Am I misanthropomorphizing my bikes?

I think we like a more comfy ride plus I have this fear it'll explode in my face cuz I put it on wrong or like when one of my coconuts fell on my head it just wasn't my day.
The fundamental error in what you posted is that the recommended pressure is on the tire sidewall. That number is the MAXIMUM pressure and almost always higher (or much higher) than what you should use.
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Old 04-15-24, 09:38 AM
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Originally Posted by juntjoo
Am I misanthropomorphizing my bikes?
Not sure that's a real word when you put the mis on it, but if you are thinking of your bike as a trusty steed then you might be. <grin>
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Old 04-15-24, 09:51 AM
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Just check out the Silca tire pressure calculator and be done with it. I generally run 65-70 psi in my road bike tires, depending on size. That's a perfect compromise pressure for me, feels is fast on good pavement, yet doesn't feel like a pinball bumper on rough roads.

On my MTB, it's a wide range...depends on which tires, which bike, and what I'm doing with it that particular day. If I'm racing my XC bike, I'm definitely over-inflated from what would be considered most efficient. That being said, I've "burped" tires before, so the higher pressure gives up some efficiency for better reliability. In non-racing, recreational scenarios, I'll generally run lower pressures, because it's not a big deal to stop and pump a tire back up(and it rarely happens.) I should just put cush-core inserts in my race wheel set, but I guess it's just a reflection of my own bias against something different.

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Old 04-15-24, 11:00 AM
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Originally Posted by juntjoo
Thanks. I think more is better in most cases aside from off road is my impression. Didn't I read it's safer for your tires too as far as ease of puncture?
​​​​​​.
More is not really better for either speed or grip. For example if you go 10 psi above the optimum pressure for rolling resistance, you lose a lot more speed than if you go 10 psi below the optimum. Itís counter-intuitive in regard to speed and going much above the optimum point is costly in rolling resistance. Being a little under-inflated on the other hand has little loss of speed, but gains in both comfort and grip.

So what is the optimum pressure? That depends on several variables (weight, tyre width, rim width, road surface etc) which are best dealt with using one of the reputable online pressure calculators (Silca or SRAM)
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Old 04-15-24, 11:47 AM
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Originally Posted by PeteHski
More is not really better for either speed or grip. For example if you go 10 psi above the optimum pressure for rolling resistance, you lose a lot more speed than if you go 10 psi below the optimum. Itís counter-intuitive in regard to speed and going much above the optimum point is costly in rolling resistance. Being a little under-inflated on the other hand has little loss of speed, but gains in both comfort and grip.

So what is the optimum pressure? That depends on several variables (weight, tyre width, rim width, road surface etc) which are best dealt with using one of the reputable online pressure calculators (Silca or SRAM)
Thanks! I would have assumed otherwise
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Old 04-15-24, 12:23 PM
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now I use 80 PSI on most road bike tires (28s) maybe a little less on hot days.

there's no single right answer, and more info is often confusing to people who are relatively new to the sport

/markp
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Old 04-16-24, 07:11 AM
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I always inflate my tires between the minimum and maximum (middle) recommended on the tire rating and I'm happy with that. I ride on all kinds of surfaces and I and I'm definitely not going to adjust the pressure every time I ride with or without panniers. I don't compete, I ride my bike for leisure and travel. On the other hand, I check the pressure every two weeks or so.
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Old 04-16-24, 07:18 AM
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Try the tire pressure calculator at Zipp.com. I run tubeless tires on hookless rims. Using 28/30mm tires I no more than 55psi. I check the pressure before every ride.

https://axs.sram.com/guides/tire/pressure
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