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

learn more… | top users | synonyms (2)

3
votes
2answers
140 views

Can I inflate to 8bar?

I am quite new in the world of urban cycling and I am liking it A LOT. for the sake of curiosity I want my wheels to be as hard as possible, know how this feels and how my bike behaves. As of now, ...
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. ...
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
5answers
125 views

How can I tell if I have properly patched a tube? (specifically a 2" mt. bike tube)

I normally swap out a the tube on the trail if I get a flat and then patch at home. So that leaves me with a patched tube ready to put in a tire and I'd like to test it without having to swap out a ...
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 ...
2
votes
1answer
26 views

How do I work out tube and rim strip size [duplicate]

I have a Schwinn Men's Volare 1200 Bike, 700c. Recently had a flat. I am confused. What size tubes do I need to buy? And also the rim strip snapped. What size rim strip should I order
0
votes
1answer
48 views

Whats the trick with the thump?

I have repeatedly pushed the valve stem back into the stem and try after try am failing at thumping the valve stem out to where I can grab it. I have pushed it through with a piece of bailing wire; ...
2
votes
2answers
90 views

A pin punctured my tyre. Should I only replace the inner tube, or patch the outer, rubber tyre?

Today I managed to run over a flat heat board pin, and my tyre got punctured. I will change my inner tube tomorrow, because it's not that expensive and I find it easier than patching it up. My ...
2
votes
3answers
77 views

Front wheel tube slowly leaks air

After I changed tires to conti 4 seasons in my road bike, the front wheel has been leaking air very slowly. I've changed tubes some 3 times already, and it keeps happening (after a couple of weeks). ...
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
2answers
125 views

Should I change the tire and tube or can it be patched?

Someone deliberately pierced the rear tire of my fixed gear bike. It's a 700cX25 tire with 700cX18-23 tube inside. As you can see from the image the threads have come out. I am not sure about the ...
1
vote
1answer
87 views

Presta Valves keep failing

New to this site. Hope you can Help. I have been commuting on a hybrid for years. A nice CUBE with hybrid tyres with Scrader valve. The odd puncture here and there. Par for the course. Now I have ...
7
votes
4answers
156 views

How can I tell if a tire contains slime?

I recently had an inner tube on my mountain bike changed, but it was my wife that actually took the bike in to the shop for service. When it came back I noticed the stem has a blue cap rather than ...
3
votes
0answers
41 views

Replace Regina valve with Presta

I have recently bought an Italian bike that uses Regina valves and I need to replace one of the inner tubes. Since I don't live in Italy and can't find that kind of valve anywhere, I thought of using ...
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 ...
5
votes
2answers
204 views

Inner tube blows up due to rim holes

I've decided to cycle to work and got myself a new bike. When the bike arrived I inflated the tyres to 80psi (20 below recommended) using a track pump. Instantly the inner tube blew up. I thought the ...
7
votes
2answers
29k views

I have 27 inch wheels and need new inner tubes what size can I use

I have 27 x 1 1/4 inch tires on my bike and need to buy new tubes. Can I use 700c or just 27 inch?
3
votes
4answers
126 views

stop air leak when disconnecting inflator from presta valve

Presta novice question. When removing the adaptor and quickly screwing the inside core down, air escapes. I've changed from a short Zefal pump to using a compressor. The tire says 50-60 PSI, but by ...
0
votes
1answer
68 views

How to understand tyre sizes? [duplicate]

I'm a cycling beginner and am trying to purchase spare inner tubes from amazon. The tube sizes are usually given as: 20-622 - 25-630 27x3/4 - 27x1.00 700x20c - 700x25c How should I understand these?...
0
votes
2answers
48 views

I have bike tires that read 26 x 1.95. Does that mean I need a 26-inch tube? [duplicate]

I ask because my front tire's inner tube got torn and I needed to replace it. It was 26 x 1.95 as well and I bought a 26 inch bike tube and it was too big -- inflated it would hang 2 inches off the ...
0
votes
3answers
120 views

Patched up my tire and still lost air again [duplicate]

I recently popped my tube and I took it out and put a patch on it and made sure that there were no other holes and I didn't find any so I filled it up and rode on it for about an hour, then the next ...
8
votes
3answers
3k views

Tubular Glue vs Tubular Tape

I'm looking into going for tubular tyres and I'm new to this part of the world. As far as I understand there are two main options to mount the tyre: 1. Tube Glue which kind of a pain in the ass time-...
0
votes
1answer
146 views

Will a “700 x 25-32cc” inner tube fit my “700Cx28/38c” / “ETRTO 622x20” rim? [duplicate]

I have a road bike that has a flat tire, the rim is marked with the text 700Cx28/38c ETRTO 622x20 I am specifically looking at this Continental tube on Amazon. Under the sizing options there is ...
4
votes
2answers
386 views

How tight should your stem valve nut be?

I just got new schrader valve tubes that have the rim fitting nut on them. Since this question has not been asked on here before, what is the proper tension that the nut should meet the rim? My ...
7
votes
6answers
2k views

Heavy Rider (300lb+) - Please recommend a 26" tyre to avoid tyre pinch

I ride a hybrid on 26" rims currently fitted with hybrid tires. As I am 300lbs+ the rear tire runs permanently deformed/flat and the rims ride over the rubber causing tire pinch. Can anyone ...
18
votes
7answers
48k views

When should you replace tires after getting a flat?

A nail punctured my rear wheel tire today while riding. My question is, how do you know if you need to replace a tire or simply repair it with a tube repair kit? The hole looks pretty nasty. The cap ...
8
votes
2answers
95 views

putting a presta stem nut inside the rim?

Has anyone ever heard of this? I'm not sure how it happened, but when i went to replace my tire today, I found that I had two stem lock nuts on my valve. One inside the rim and one in the normal place....
3
votes
2answers
6k views

Can I use a shock pump to inflate a tube?

I know that shock pumps are meant for high pressure applications so that they can withstand high pressures needed by suspension shocks. However, can I use a shock pump to inflate my tire in a pinch ...
41
votes
2answers
8k views

What are the effects of completely filling tires with water instead of air?

As absurd as it sounds, I was curious as to how a bike would handle with the front tire filled with water. I wonder if steep hill climbs would be easier (particularly for a mountain bike): 1) to ...
5
votes
2answers
1k views

Will Slick Tires Work for a Mountain Bike Ridden by a Heavier Rider?

I've owned a Trek 3500 bike (shown below) for 2.5 years now and I like it very much. My bike has the same specs as under the link. It has the XL frame size and 26" wheels with Bontrager AT-550 36-...
3
votes
4answers
365 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
37 views

Tube Flat Fold Width

I work in the bicycle industry and have never heard nor needed to know the term Flat Folding Width of a tube. Is this even pertinent information to anything other than maybe how many you can jam in ...
4
votes
3answers
2k 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 ...
1
vote
1answer
165 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 ...
1
vote
2answers
4k views

unblock slime presta valve

my Sons bike has slime inner tubes. The bike has been sitting in the garage since last summer and the front tyres valve now seems blocked. Its has what feels like 15-20 psi in it but I can not get ...
6
votes
9answers
55k views

Why do my tires keep losing air, even after having the tubes replaced?

I had a problem a few weeks ago where my tires were flat and needed air every time I took my bike out of the garage. I brought it to the local bike shop, and they replaced my tubes. This made a ...
1
vote
3answers
19k views

I need help replacing my bike's tube

I recently popped the tube in my front tire and need help replacing it. I don't really know very much about bikes or the assortment of numbers on tubes, tires, and wheels. Here is what I do know: The ...
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
3answers
160 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 ...
2
votes
3answers
196 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?
11
votes
2answers
681 views

What happened? tube blew the rim?

Had a puncture today, removed the tube, patched it and made it home. Obviously since I only have a mini-pump I could not inflate it to my 8 bar usual pressure. When home, I took the wheel upstairs to ...
7
votes
5answers
369 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
1answer
69 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.
1
vote
1answer
541 views

Tire's won't inflate after winter

A few weeks ago I tried to take my Trek road bike for my first ride since last fall. It has been sitting in my (uninsulated) garage over throughout the winter and when I tried to inflate my tires the ...
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 ...
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 ...
1
vote
2answers
289 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 ?
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 ...
1
vote
4answers
601 views

Storing an inner tube

I got a spare inner tube with my bike, which is good. I checked how it was packed and found it was sticking somewhat when I pulled it out of the box, which I can only imagine is bad. Would it be ...
2
votes
1answer
210 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 ...