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

learn more… | top users | synonyms (2)

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1answer
59 views

Innertube fat on one side, skinny on the other [duplicate]

I just bought a bicycle/bike tube (20"), when i inflate it, 1 side of it goes big/fat and the other just inflates normally, what should i do? , its happened with some of my other tubes.
7
votes
5answers
328 views

Why (and how) would someone steal only my innertube?

Upon my return from winter holidays, I found that someone had stolen the rear innertube from my locked bike. They took only the innertube: the rear wheel was still there, the chain correctly attached, ...
1
vote
2answers
68 views

Can Inner tube 1.25 / 1.5 fit 26x1.4 tire?

I have a tire 26 X 1.4 what size tube should I buy for it? 1.25 or 1.5 Inner tube ?
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 ...
3
votes
4answers
130 views

inner tube width range relative to tire width: reliability effects?

[Apologies if this seems like a dup: I see there are lotsa tire+tube questions, but this one does seem to be slightly different, in that it strives for generality and concerns choice between ...
2
votes
1answer
86 views

Is it 'safe' to use a 700 x 47c tyre on a rim with inner width of 15mm?

Looking to upgrade my tyres on an old roadie mash up to something chunkier so I can handle some off road sections on a ride coming up, currently it has a 27 x 1 1/4 front tyre and a 27 x 1 3/8 rear ...
0
votes
2answers
128 views

Future of Tire technology

Why do tire producing companies still produce tubulars? Isn`t Tubeless the technology of the future?
2
votes
3answers
170 views

Do you know of tubes that are fully flat-proof?

I am looking into whether there are inner tubes that are fully flat proof. Do you know how much they would affect performance and comfort?
5
votes
2answers
138 views

Is my pump faulty or my tyre?

I have recently bought a Specialized women's road bike and for the last couple of weeks was borrowing my boyfriend's hand pump with no real issues. Last night I finally purchased my own (Topeak ...
3
votes
2answers
199 views

Should I be able to peel off a glued tire patch?

One of the things that I've noticed with the low-cost tube patch kit that I bought is that I'm able to catch an edge of the glued patch with my knife or fingernail and peel the patch off the tube like ...
5
votes
1answer
630 views

Is it ok to use an inner tube that is slightly too large for the tire?

My hybrid bike tire measurement says 700x35c. I ordered a replacement inner tube stating it was 700x35-40c but when it arrived it is actually 700x38-45c. Could I still use this or will it cause a ...
2
votes
1answer
143 views

Will Stans No-Tubes (or other tubless tire sealant) work in a standard tube to prevent leaks?

I typically buy tubes with removable valve cores (Qtubes brand typically) and I have some stans leftover from a tubeless tire setup for my mountain bike. Would adding Stans to the tubes on my ...
0
votes
1answer
99 views

flat tyre even after replacing the tube? [duplicate]

So I bought a used Specialized Sirrus 2011 model as my first bike (so I'm new here) recently and I love riding it, light weight, smooth handling and comfy to ride. Rear wheel was flat when I bought it ...
1
vote
1answer
68 views

Uneven inflation of a new inner tube? [duplicate]

I bought a new inner tube and when I tried to inflate it, the tube got unevenly inflated (check picture). This is the first time I'm installing a tube by myself so I don't know if this is normal. Do ...
0
votes
0answers
48 views

proper tube size for bicycle tire [duplicate]

My bicycle tire specification is 40-622 (700x38C-28x1 5/8 x 1 1/2), would you please tell me the right size of the proper inner tube?
4
votes
3answers
411 views

Is it normal for a presta valve to unscrew into two pieces?

I have a Continental Road inner tube with a threaded presta valve. I also have a threaded bike pump which I screw onto the valve to inflate the tube. When I try to unscrew the pump, the uppermost ...
6
votes
1answer
102 views

Can I fix a bad tube patch?

So I did a hasty fix this morning when I had a puncture. It got me to where I needed to go, but by the evening it was flat again. I checked under water and there is that tiny little air bubbles ...
3
votes
2answers
106 views

What causes a tube to become deflated on its own?

I recently went to get my bike ready for a ride, and I noticed right away that my rear tire had completely deflated. I took off the wheel, and took out the tube and checked it for puncture but didn't ...
3
votes
4answers
113 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 ...
5
votes
4answers
292 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?
1
vote
2answers
58 views

Why does rear tire lose 35 psi in a week with new innertube and tire?

My hybrid bike recently got a piece of glass through my rear tire and innertube. I bought both a new tire and innertube (700x35c schrader). I filled up both tires to 65psi. A week later the front ...
2
votes
1answer
87 views

What is the middleground between permatube and normal tubes?

I've burst my third tyre in two months on my MTB, each time it's caused by something sharp penetrating my tyre at high speed ripping a big enough hole in the tube causing the slime to leak out rapidly ...
7
votes
2answers
232 views

Does the valve have to be straight when replacing a tube?

I've just replaced the tube on my bike and when I pumped it the valve wasn't particularly straight as can be seen in the image below. What I'm wondering is do I need to remove the tube and ...
1
vote
1answer
78 views

Tyre popped when going from 26 x 1.95 to 26 x 2.125

My wheel had 26 x 1.95 tyres. I bought 26 x 2.125 thinking it would fit. While fitting the new tyre, it bulged outside at one location and the tube also came out for about 7 inches. The tube is the ...
5
votes
2answers
171 views

What is mysteriously slicing the inside of my tubes?

For about the last year, I've had a problem keeping my bike on the road. Originally, my rear tube went flat when the tire was punctured by an office staple (don't ask me how a regular office staple ...
3
votes
1answer
227 views

What is the actual size of a 26x1.5/2.2 tube?

I've got some spare Specialized "Airlock" inner tubes that are size 26x1.5/2.2. That means 26 inch rims, but what does the 1.5/2.2 mean? It fits 1.5 to 2.2 width tires or something else? Curious what ...
7
votes
8answers
415 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 ...
1
vote
2answers
75 views

What inner tube size to get for my road bike?

I want to get some spare inner tubes for my new road bike, but I'm unsure what size to get. On my tire it says the size is 700 x 25c and I know that 25 is the max width of the inner tube. So should I ...
4
votes
3answers
120 views

Do stocked tubes go rubbish over time?

I'm stocking tubes that I found in discount. One of my friends said that tubes get old over time. Do Butyl tubes do this? If it is true, what are storage tips for stocking them? And they came packed ...
5
votes
1answer
725 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 ...
3
votes
1answer
64 views

Third tube puncture in 3 weeks

I have the 3-rd puncture of the rear wheel tube during 3 weeks. All of them have the same pattern: 1 small breach about 0.5mm long. I added the photographs of the last one. Bubble inside the water ...
5
votes
3answers
110 views

inner tube length size question

So I bought a used road bike from WI recently. and just a couple days ago i got a flat. I took out the tube wanting to patch but saw that it was all patched up. So i decided to just buy a new on. the ...
1
vote
3answers
209 views

Ideas for consistently popping tubes

I ride a cyclocross about 50 miles a week. About half of the mileage is spent on roads, the other half on single track trails. In the space of 3 weeks I have had the tubes pop 5 times. Once the back ...
5
votes
3answers
648 views

Presta valve won't let air in on a new tube

During a ride I had a flat tire and used a brand new Joe's tube with sealant. For the first time in many years of riding i was not able to pump air in. It appears that the pin inside the valve won't ...
2
votes
2answers
286 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
2answers
228 views

Using a wider inner tube

I am switching from 700cx40 to 700cx32. I have a bunch of inner tubes that I bought for the old tires and are in the 40mm range, but I don't know anymore what the range is for each (I didn't keep the ...
0
votes
1answer
55 views

1996 Mongoose size 19" Crossway 650 replacement size inner tube [duplicate]

My bicycle has a label saying size 19" . What is the tire size for my bicycle and the what is the inner tube size?
6
votes
1answer
306 views

How do self-sealing inner tubes work?

How do self-sealing inner tubes work? I understand it protects against objects up to a certain length, but do I need to still remove the offending object eventually? Or do I need to leave it in? Are ...
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votes
2answers
75 views

What will be the effect of nitrogen if it filled in two wheelers tube? [duplicate]

What if I fill liquid nitrogen in tube of two wheeler?? Is it OK?
0
votes
2answers
151 views

Why is the tube too long? [duplicate]

My current tube was badly pierced by a screw in the street, so I wanted to replace it with a new one. The tire is a Continental 32 - 622 (28 x 15/8 x 1 1/4 - 700 x 32c), so I bought a 28" tube, ...
2
votes
2answers
2k views

inner tube to fit in a 26 X 1.5 bicycle tire

I have a tire 26 X 1.5 what size tube should I buy for it? As yet I have not tried tubes because I don't know what size to buy.
1
vote
2answers
145 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 ...
1
vote
0answers
86 views

Bumpy ride. Is it the casing or the inner tube?

I pumped a new tube to about 80 psi (I missed that on the casing the recommended pressure is 100 psi). On the ride immediatly, I hit a very small kerb harder than I wished and after I noticed that my ...
2
votes
2answers
226 views

Tube puncture over spoke, but rim tape fine

I have a puncture in my tube on a bump in the tube that coincides with a dip in the spoke hole, and am not sure if I need to replace the rim tape or not. I have seen numerous posts about spoke ...
3
votes
1answer
217 views

How to find correct size inner tube

My tyre says 700x38 on the side of it. what size inner tube would I need for the wheel? I've ordered a 700x35 inner tube but it seems a little too big for it?
1
vote
2answers
97 views

Inner tube popped on back side of the valve - why?

One hour after my first 20-minute ride with new inner tube it exploded with "ps-BAH!" sound. Also, as you can see on the photo, two bulges appeared near the hole. The tire (25mm) allows up to 8 bar ...
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?
1
vote
3answers
1k 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 ...
3
votes
2answers
478 views

How to guesstimate correct tire pressure in the winter?

I ride a rather generic Merida hardtail mountainbike throughout the year. I don't own a pump with a gauge so I usually pump my tires at gas stations (that have automatic pumps with gauges). The ...
3
votes
3answers
857 views

I keep breaking the tips off my presta tube stems

I can't pinpoint what I'm doing wrong while inflating my tubes. I use presta valves and have a "Joe Blow" Topeak pump. I put the tube stem at 12 o'clock, I unscrew the tip of the tube stem (but not ...