35

CO2 charger cartridges are used for bike tire inflation because they are a common, inexpensive product that has been around since the 1950s. Their other uses include powering air guns and inflating life vests. They were originally developed by the Crosman Corporation and marketed under the name "Powerlet". Powerlet cartridges are filled with CO2 presumably ...


26

I believe you will find these articles informative: The hidden life of a CO2 cartridge [PDF] The CO2 Cartridge … an Under-Appreciated Marvel of Technology! — George Fox Lang [PDF] At room temperature (below the 31°C/87.8°F critical temperature) a CO2 bottle is to a practical extent self-regulating. This is not possible with simple compressed air. You ...


18

It can't burst the tube, because the tube is completely surrounded by the tyre and rim. Bear in mind, though, that higher pressures don't automatically mean a faster ride. There are two competing factors: a soft tyre is constantly losing energy due to being squashed flat against the road, but a hard tyre loses energy because any bumps you go over have to ...


15

As a heavy rider personally, I don't have many issues with flats. A normal tire on the high/maximum pressure works fine to avoid pinch flats. The key is to check tire pressure every time you get on the bike. Even a day will allow a tire to soften 10 psi, and that will allow flats to occur. Road hazard flats are not avoidable except by avoiding the ...


12

Each type and size of tire has a different pressure range. The range is written or embossed right on the side of the tire. The actual pressure you choose is dependent on what you are using the bike for, the road surface you ride on and your general preference. A safe choice the middle of the specified pressure range. Lower pressure will give a bit more ...


9

Short answer: no. The only fix is to mostly deflate the tyre (so it's just barely inflated, enough to hold it in place but soft enough that you can manipulate the bead) and work the slack in the bead around the wheel so that you have an even distribution. If you're really lucky there will be a matching place elsewhere that the bead has stuck in the middle ...


9

Your opening claim: 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). Is actually not true. Your next claim isn't true either. The contact patch area for a tire will be nearly the same regardless of what width tire is used, for a given pressure. If I ...


9

After reading the answers here and becoming more curious, I found this article, which agrees with @Daniel. to briefly summarize it, they found that at the same tire pressure the narrower tires deflected more and had a lower stiffness (force over displacement) A curious finding is that a difference of 1 bar (14psi) makes more of a difference that a 5mm tire ...


8

DT Swiss publishes the exact document you are looking for: Manuals page / RIMS / Tire Pressure/Dimension (PDF) The document specifies the maximum usable tire pressure based on rim and tire width. More narrow tires allow for higher pressures. For example, the rims in the question (XR 400, inner width 18 mm) are compatible with tires ranging from 23 mm width ...


8

No, not really. It is difficult to get an accurate idea of tyre pressure by pressing it. Especially for thin, high pressure road bike tyres - they should feel pretty hard. Even if they do feel hard, the pressure may be much lower than it should be. Best option is to get a good pump, with a built in pressure gauge. Many mini pumps will take a lot of effort ...


8

The maximum tire pressure should be written on the sidewalls. Often the embossed lettering is hard to read, shining a flashlight at an angle can give you the contrast to make it easier to read.


8

This explains part of the reason in what may be too much detail:http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch4/deviation5.html If you're going to read any of it, read the material starting after the table listing "van der Waals Constants for the Various Gases". It calculates that compressing CO2 from 1 Liters to 0.2 Liters using the Ideal Gas Law (...


8

The type of tire cracking that is most worrisome is when it's accompanied by bulging areas from the tube pressure. This implies damage to the casing, which in turn implies a tire that might very realistically fail at any time. The casing is the major structural part of the tire, not the rubber. Cracks in the rubber like this look bad but almost never result ...


8

How wide are the tires compared to the rim? Wide tires at high pressure put stress on the rim’s sidewalls which can result in sudden, catastrophic failure. If the tires are relatively narrow it’s probably okay to over-inflate, but I doubt you’ll see much benefit. There are diminishing returns for rolling resistance. See for example this test of 56mm wide ...


7

The reason that rims have maximum tire pressures is because the tire presses out at the bead seat. This load is carried by the "bend" in the 'U' shape of the rim. Higher pressures put more stress on the rim and, given enough pressure, will cause it to fail either at the bend or perhaps through the spoke holes if that is the weak point. With rims designed ...


7

We don't do product rec here, but some general advice: You want to find the biggest tires you can fit into the bike, and run them at high pressure. The pressure written on the tire sidewall is useless (the maximum pressure depends on the rim and the tire), but in all likelihood you will be close to or exceeding it on many tires. The particular model of tire ...


7

Do a web search for tandem tires. A tandem bike carries two people, so typical loads are even bigger than you. Also, definitely use a pressure gauge. You may think you can tell by feel, but I ride every day and can't tell the difference between 80 and 100 psi.


7

I'd change it for a better tire, one that's much tighter on the rim. You inflated out to only 15 psi over its maximum. That kind of force could easily be generated in a quick turn with the brakes on. If the tire blows off in such a scenario, then you'll be underneath the vehicle you were trying to avoid. Go to your LBS, and explain that you want a ...


7

Free stuff - start with your bike fit. Make sure your saddle height is high enough, but not so high your hips wiggle while pedalling. Check brakes for rub - adjust brakes or true wheel if required. Carry less stuff - wear fewer clothes when riding. Roadies tend to avoid big flapping jackets, and their clothes are more close-fitting. Carry the right ...


6

I would suggest contacting the manufacturer. They should be able to provide you with a chart indicating the maximum allowed tire pressure for different sized tires on your rim. It is worth noting wheels designed for situations in which you typically run low pressures (cyclocross, cross country MTB) do not need sidewalls as strong as wheels designed for rim ...


6

Running 23 mm tires on a rim width of 23 mm is insane -- your tires should be around to 40-50 mm. To summarize Sheldon Brown's page: Narrow tire on wide rim = pinch flats + damage from road hazards (which is the case you are in) Wide tire on narrow rim = sidewall damage + rim failure and bad handling You need to get a narrower rim for the bike (or ...


6

The loss is friction in deformation of the rubber of the tire. When you flex the tire from round (when not on the ground) to flat (when touching the ground) there is heat generated. If the tire is narrower and the pressure is higher, there is less rubber involved in the flexing. It is true that higher pressure means less contact patch, but that is not ...


6

This is close to my goto answer for tyre issues. Tyres designed for touring use are meant for higher loads and inflation pressures. I run marathon plus on my commuter hybrid. They make a 26x2.0 version which is rated to a load of 260lb per tyre and 70psi inflation (which you could probably exceed a little). It's possble that won't fit your rim (see ...


6

The correct tire pressure for you is typically not whats written on the tire sidewall. That's an arbitrary number determined by the marketing and legal departments at the tire manufacturer, not the engineers (usually it leads to an overinflated tire, which can damage the wheel and reduce control of the bike). You'll have to play with the pressure to get a ...


6

There are Presta, and Schrader valves. There are also dunlop valves but they are far less common these days, especially in the US/UK. Schrader and Presta are two different diameters and valve types. There are pumps that will inflate either, there are also pumps that only inflate one or the other. Many people use a pump with a built in gauge rather than ...


6

Tyres will always lose pressure over time, I would say that for cycle tyres 1-2 psi is closer to the norm for most including me. This is mainly due to the microscopic pores in the tyre/tube which air molecules escape through over time. However don't forget that the air in tyres also expands and contracts with temperature, so on colder days tyre pressures ...


6

You can have an "optimum" tire pressure - unfortunately, when riding on road you want higher pressure, when riding on low grip surfaces you want lower pressure (more tire in contact with the ground), when riding on very uneven terrain you want again higher pressure to prevent flats, when jumping you want higher pressures, and so on and so on. The desired ...


5

Generally, the tire pressure range marked on the tire is somewhat loose - the marketing department wants a big range since it will sell better, the legal department wants a small range so liability is lower and the engineers have something probably bigger than whats marked on the tire as safe. Your tire pressure should be high enough that you don't get pinch ...


5

I have/do carry an Lezyne Allow Drive pump. I have spent a lot of time pumping fat tires in really cold temperatures and although it's not as quick, it's compact and packs well. That Lezyne floor version doesn't look too bad, but it is still a bit big to pack for my tastes. It looks like they have a specific HV hand pump out that is designed like their ...


5

The markings on the tires for the pressures can be essentially ignored. They're a combination of marketing and legal departments coming up with essentially arbitrary numbers. Find a set of pressures that works for you so the tires are properly inflated -- it should prevent pinch flats, but keep rolling resistance low and absorb road hazards and ...


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