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26

I happened to do just that. I took an old hand pump and an inner tube to the bath tub. Submerged the pump and pre-filled the tube with water, complete with burping out any air bubbles. With the tube moderately full and free from air, I put it on the rim with the tire. Then the final pressure up. The first thing to notice is that the pump operates with ...


10

This kind of failure is typically caused by excessive wear on the brake surface of the rim. Every time you apply your brakes, you are polishing small amounts of metal away from the rim. Eventually, the rim gets too thin and weak, and will crack, like you have seen in your photo, from the normal inflation pressure of the tire. In general, this means tht ...


8

My rule of thumb is the following: Never patch a patch: when a puncture is too close to another patch so that the patches would overlap or almost, then I toss the tube Never patch too close to the valve: the valve makes is a structural anomaly in the butyl that makes the tube, so is a more sensitive area, not to mention all the air input comes from there ...


6

I've found that the amount of time I let the glue dry makes the biggest difference. It really needs to get from "wet" to "tacky" to work best. Scraping the tube and the glue brand make a bit of difference too. If the patch seems relatively well stuck, but comes up when you try to take the backing off, just leave the backing on; it won't hurt anything.


6

It goes outside the rim, where you can see it. It's not even strictly necessary. It really only exists to keep the valve stem in place while you air the tire up, which makes the whole process much easier. Weight weenies throw them away to save a couple grams. Also note that if you use it, you don't want to screw it down too tight. Doing so can crimp your ...


5

Since the actual tire has burst, I think the most likely cause is that over the course of the 4000km you have ridden, the tire has suffered a cut or other damage that you did not previously notice. While sitting in your room, the pressure of the tube has gradually stretched the damaged area, and then burst. Inspect the other tire to check for cuts or ...


5

The manufacturer sells said "vulcanizing solution" in quantities of 25g tubes through 1 gallon cans, so you should be able to buy it in larger quantities. Indeed, a quick search of Amazon yield 8 oz cans (or slightly cheaper), and while I couldn't find it on something well known like Amazon there are other places that sell the 1 gallon quantity. However, as ...


4

A normal clincher tyre will have a "bead" as shown in the following diagram. It's possible you have a "tubalar clincher" like this: If none of those quite look right, could you provide a photo?


4

You may have a sort of systematic effect, such as debris (puncture causing material) near the patch site, or missing rim tape or something depending on where the patch is. It may not be easy to find the causing material unless the tire is flexed under load though, which is why you might just not see it. Either that, or you're consistently not applying the ...


4

Everything you could want to know about tire sizing is here, including recommendations of how wide a tire should go on how wide a rim. In your case, you will look for tires made for 26" rims (ISO 559), but generally, narrow rims should have narrower tires than wider rims. These tires will be marked 26 x decimal number (by decimal number, i mean a number ...


3

One critical step that's often missed is thoroughly bedding the patch. After installing it (I prefer the glue to not be totally dry but with a few specks of "damp" yet) but before removing the plastic backing you take something like a smooth-ended tire iron and rub it slowly back and forth across the patch, pressing hard. This assures that the patch, tube, ...


3

When I make a repair, I also do the following extra steps, to make sure that the patch holds. I have never had a patch come off/leak when using this technique. Use a little bit of sandpaper to remove any ridges on the area to be patched, such as a manufacturing join. Clean the area to be patched, this makes the glue/solution adhere better to the tube. ...


3

You might want to remove your schrader valve's stem (innards) with a stem removal tool and check the valve's rubber seat, located on the part that you remove. There may be debris lodged in the valve seat such as grit or sand or some dried slime that would cause it not to seat and seal properly. Also consider switching the valve stem core from another valve ...


3

One of the most common uses of old tubes that I've seen/used is to wrap your drive-side chainstay with one. It's cheaper than buying a dedicated protector and it's readily replaceable. Just cut the tube somewhere and wrap it around the chainstay, and then secure it with either zip ties or some tape. Another fun idea is doing a ghetto tubeless setup where ...


3

Those are scuff marks from running the tire flat (or nearly so), and/or from a tire whose sidewall is breaking down. One suspects that underinflation played a significant role in this tire failure. If you can see "ripples" in the side of the tire while you ride it, it's way under-inflated. One wall of the tire will tend to fail before the other, based on ...


3

I'll sum up some of the comments with some concerns that you need to address: Excessive moisture Temperature changes Abrasion and movement Access Simply wrapping the tube in something non/semi-porous and opaque will help keep it safe from the elements, but not from temperature changes, but it sounds like that's not going to be too much of a factor. You ...


3

No. For patching punctured innertubes, you must use vulcanizing rubber cement. Vulcanization which crosslinks the polymers in the tube with those in the patch. Most types of rubber cement, which are used for crafts, are not vulcanizing. Aluminum rim cement is designed to bond aluminum, not to vulcanize rubber.


3

My conclusion after many years of using not two, but three types of valves is that the best is the one that results most practical for you, acording to type of riding, type of pumping methods available and of course the type of bike/tire/rims you are using. Neither valve type is absolutely better than other, but one of them may result better for your ...


3

The visible strip sticking out from the top of the rim and inside the line is in fact the Chafer strip. This is on the tire to prevent the bead hook on the rim from cutting into the tire. The bead is the wire or in the case of folding tire such as the x'plor ush Kevlar ring on the edge of each tire. When seating the tire the bead is place inside the bead ...


3

Based on your edit, do this. Remove the wheel, deflate to about 10 PSI, then roll it along the ground, pressing down hard, for several revolutions. After you've done this examine the strip. Anywhere where the strip is not showing the "average" amount, tug on the tire to pull it out. Anywhere where the strip is showing too much, first examine the opposite ...


2

at normal temperatures (human life temperatures) and pressures all gases behave about the same with temperature variation. Check out this article and the pressure tests of air, CO2, and nitrogen at the end: http://www.powertank.com/truth.or.hype/


2

Innertube failure can be caused by a variety of factors, and it is usually possible to determine the cause by examining the failed innertube. You mentioned: "In the last week, two innertubes on two different bikes exploded". If it literally exploded into many small pieces, then you were probably the target of a saboteur. :) More likely, the innertube has a ...


2

I looked around the internet to find any evidence of the effects of tire liners on speed, but couldn't find any. I was considering using them while touring. So, I did my own test. My bike is a mid-range steel framed tourer with Schwalbe 26" x 1 3/8 Delta Cruisers. The tubes are Bontrager. I installed the liners as per instructions and took the bike out for ...


2

If the pebble was sharp, it definitely could be the reason. Each time before you change the tube, check the tire from the inside for any thorns that stuck or (something that happens quite often) glass particles that left inside. Using sealant tubes could be another great idea if your main riding is off road (I think that without them I would be changing ...


2

That does look like scuff marks from installing it, but I agree you wouldn't find them all the way around. It may be the tube was twisted and when you inflated it, it untwisted and scraped itself against the bead. Try dusting your inner tubes with talcum powder before installing them. The talc will lubricate the tube and allow it to move freely against ...


2

It's hard to tell from that video - a side view would have been more useful. From what you say it seems the rim is actually round in both planes - it doesn't wobble side to side or up and down as it rotates, so it's not that (but I can't see the rim in the video so I don't know for sure). If the problem is the tyre it will be either because the tyre is not ...


2

From the experts at Park Tools: Patching an Inner Tube Using a Vulcanizing Patch Kit Glue type patches require the application of a thin layer of self-vulcanizing glue on the tube before the patch is applied. To fix a flat, first locate the hole in the inner tube. If possible, re-inflate inner tube to at least twice the normal width. Inspect for air ...


2

Here are some Ideas: Tires: Knobby or not, tires that are "fat enough" can be cut and fitted under the downtube to protect it from rocks thrown by the front tire. Remove part of the sidewall of each side, cut to a propper length and fix it with zip ties. (This is actually what I have done with my DH bike, partly because it is usual to transport it with ...


2

Pros of Latex Tubes Lightweight compared to butyl tubes More flexible than butyl tubes, leading to a smoother ride. Cons of Latex Tubes More expensive (about 3 to 4 times the price) May be more susecptable to blowouts. Should be powedered with talc before installing to reduce stickyness and avoid pinching. Looses pressure more quickly due to more porus ...


2

This kind of thing is common. I'm answering because I can't comment yet, but the previous answer nailed it. I just wanted to add. You need to really inspect the tire around where the punctures are happening. The worst thing is small bits of metal wire from decaying car tires that litter roads. They get stuck in the rubber in your bike tires and are really ...



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