A rubber torus shaped balloon which is inflated via a valve inside a tyre to keep it rigid.

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44
votes
13answers
17k views

What type of tires can prevent goatheads?

We have a lot of goatheads1 in our area, and they have a tendency to do something like this to bike tires: Unfortunately, I ride a road bike (specifically a Kona Dew), so I have much smaller, ...
6
votes
4answers
365 views

Which tube size to prefer if several options apply?

I have 40-622 (a.k.a. 28x1.5") tires, and Schwalbe offers two different sizes of tubes - their models "17" and "19" - as applicable for that tire size. Ok, either one would surely fit well. But ...
8
votes
5answers
2k views

Slow leak on front cruiser tire

I ride my cruiser to the supermarket and back, using either a trailer or a basket over the front wheel for carrying groceries. The bike has developed a persistent slow leak on the front wheel, and I'...
5
votes
1answer
1k views

Is it normal for an Inner tube to bulge when inflated?

I recently bought a pair of inner tubes and when I partially inflated one of them before putting it into the tire (only a few pumps with a floor pump), I noticed a portion of it was bulging out ...
1
vote
3answers
3k views

Where is the proper location to measure the tube size?

I need to replace a tube in my bike. I know there are many tire sizes. I bought 26', assuming that my bike was that size, and realized when I got home that I didn't even know where to measure from. ...
38
votes
11answers
45k views

Can I use a Presta tube in a Schrader rim?

I keep losing pressure in my tires, and among other things, I'm looking at the valves in the tubes. It's an old mountain bike with 26 inch tires. Can I use Presta tubes on rims drilled for Schrader ...
13
votes
7answers
2k views

How do I fix a puncture?

I got a flat/puncture on my bike tube, how can I fix it myself without going to the nearest bike shop? What kind of equipment would I need?
40
votes
8answers
17k views

How long should a road tyre hold its pressure?

How long should a road tyre be able to maintain a pressure of around 100psi, and what factors are likely to reduce this time? Background: My tyre pressures are consistently dropping to around 60psi ...
22
votes
8answers
12k views

Does the plastic cap on a Presta valve serve any purpose once fitted to a rim?

I can see the use of the valve cap on a Presta valve when the tube is still packaged (it obviously stops the valve puncturing the tube), but does it do anything except look pretty (or not) once you've ...
5
votes
1answer
8k views

Complete beginner's question: inner tube too big?

My tire wall tells me that my tires are 26 x 1.95. I bought a 26 x 1.75-2.15 inner tube. When I change the inner tube, though, the tube is bigger than the wheel by two inches. How do I determine inner ...
18
votes
11answers
19k views

Patch or replace tube?

Is it worth patching a tube on a mountain bike, or just replace it with a new one? There are a lot of 1/2" - 3/4" thorns here in Texas, and I use 26 x 1.95 tubes. Any particular patch type/brand ...
10
votes
4answers
9k views

Does the inner tube affect the maximum PSI?

If I have road tires that have a recommended pressure of 110 PSI and maximum of 120 PSI can I safely pump my tires up to that level or does the inner tube effect the maximum? I currently have the ...
18
votes
7answers
3k views

Which kind of tube valve is the best?

What kind of valve is the best one, a Presta valve (6mm) or a Schrader valve (8mm). Which has the best reliability, which one is easiest to fix a flat on?
16
votes
4answers
15k views

Should inner tube have excess length?

I've recently changed the default 700x35 tires and 35mm Schrader inner tube to 700x25 slicks with 25mm Presta inner tubes. However whilst fitting the new tire and inner tube, I noticed that the inner ...
5
votes
4answers
673 views

What size innertube for 35mm tires? (or: get innertubes on the big side or small side?)

If you had 35mm tires (Schwalbe marathon supremes to be specific) would you get innertubes speced as 28-35mm or 35-42mm? Or whichever is cheaper?
2
votes
2answers
488 views

back tire keeps going down

I have just bought a new bike and had it about a month now. I don't really know much about bikes but I do know how to repair an inner tube. I have had one puncture and just bought a new inner tube. ...
2
votes
1answer
723 views

What size of slick tire should I buy?

I purchased a mountain bike and I ride on the road most of the time and I was looking at slicks for my bike. My tire size that I have now is 26x2.00 and the rims. I have on are AT-550 26inch what size ...
5
votes
2answers
31k views

Deformed/uneven/bumpy wheel/tire/tube, how to diagnose or repair?

My bike has a deformation in the rear wheel, almost surely not due to the rim. At some point the tire has a "valley", causing it to bump instead of rolling smoothly. I'd like to understand if I have ...
9
votes
2answers
2k views

Why does my inner tube have brown liquid inside? Now with internal photo

I flatted the front wheel going up a climb the other day - I heard the pop and the PSSSSHH, and I could see a geyser of pale "steam" or vapour coming out the puncture. I swapped out the tube for the ...
24
votes
10answers
11k views

Do glueless tube patches work as well as glue ones?

Quite a few years ago I tried some glueless patches for repairing my punctured tubes while out on the road, and found that they rarely stayed on for very long. I know that technology has advanced a ...
4
votes
3answers
986 views

Is it normal to wear out the rear tire with in a few months when using a trainer?

Early this year I attached my bicycle to a trainer, around the December time frame of 2011. The rear tire and inner tuber where shot by March of 2012. Riding about 24 Miles per week. Is this normal ...
22
votes
4answers
7k views

Is there a difference in having tires filled with CO₂ vs air?

When you fill your tire with a CO₂ cartridge you are obviously putting CO₂ into it. When you use a pump you are putting air into it. Are there significant temperature variations that may lead to poor ...
11
votes
1answer
1k views

What powder is used inside an inner tube?

I just cut open an old inner tube I had laying around and noticed there is a white powder in there. What is it? Why is it there?
9
votes
10answers
6k views

Any alternative use for old mountain bike tyres and inner tube?

I have recently changed the original tyres and inner tube of my 15 year old Specialized Rockhopper. They were starting to deteriorate and I got punctures almost every time I took it on gravel paths. ...
7
votes
2answers
2k views

Relationship between punctures and tube pressure

What could be the relation between a bicycle's inner tube getting punctured and the pressure of the tube. Are they directly proportional? I.e, if the pressure of Bicycle tube is higher then it has ...
7
votes
3answers
1k views

Frequent blow outs in the same location

I keep getting blow outs in my front tube and always in the same location: right next to the valve stem. The blow outs look like: On this same tube, there is wear on exactly the other side of the ...
7
votes
8answers
672 views

Mystery flat keeps happening 3-5 times a week. Do I weigh too much for my tires?

This is a little embarrassing, so I hope no one makes fun of me lol ... But I am a big girl. I always have been. Very big frame, big shoulders, big head, hands and feet. My whole life I've been ...
6
votes
3answers
3k views

Best practice for patching snakebite pinch flats on skinny tubes

So, I tend to run 700x23c or 700x25c tires on my commuter bike. Sometimes I'm lazy and forget to check the air pressure and inevitably get a pinch flat when I hit some stationary object, pothole, or ...
4
votes
4answers
3k views

How should I store inner tubes to maximize their shelf life?

The LBS's in my area tend to have major sales around the same time once or twice a year. During this time, I can get replacement tubes at about half their normal price. I can buy several tubes, enough ...
4
votes
1answer
885 views

Homemade Tubeless Tires

As I was browsing Youtube for cycling related videos, this one on making your own tubeless setup caught my eye. The procedure is essentially as follows: Clean a standard rim (not for tubeless tires,...
3
votes
4answers
125 views

Unpatchable hole on rim side

Well, I am new to road biking and I got my first flat yesterday. I was going to go for a ride and the front tire was completely flat, so I popped it off and went to patch it. I found the hole, it was ...
2
votes
3answers
4k views

What do I do if my bike won't pump with an air pump at all?

My bike tires will not pump up at all. I tried forever. I had this bike for a year and then it won't pump at all. I have a pump you stand on and use your 2 hands to pump. At first it was pumping air a ...
1
vote
1answer
561 views

What type of tires have tubes inside?

Don't judge me as stupid just yet, I'm not sure if mine's a tubular or tubeless tire but everyone says tubular tires are glued to the metal wheel. However, mine isn't. It consists of a smooth, ...