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Innertube and tire size
#1
I changed tires from off road tires (26X1.95) to road tires 26X2.25. I keep getting flats if i put more than 45 pounds of air in, they are supposed to hold 60 pounds of air. The inner tubes are 26X1.95-2.215. Is the difference in tire size my problem. Do i need to get an inner tube to match the road tire size. I just brought two new tires and one went flat already.
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#2
The tubes should work okay; but there is less margin with small tubes in big tires than the other way around.

1st guess is that tube got pinched during installation.

other guesses: the rim tape is not protecting the tube from the spokes; there a sharp inside the tube.

What does the tube look like where it failed?
Nigel
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#3
I checked the rim tape and it is ok and i put a piece of duct tape where the rim was welded for more protection. It is ruptured right on the middle where a rim spoke would be but i also checked for sharp places on the rim and the tire and all ok. The tires are supposed to hold 60 pounds of air. Do i need to get smaller tires or bigger inner tubes. I have blown 4 or 5 inner tubes since i changed the tire and that was all Wal-Mart had at the time. I am getting tired if having to put a new inner tube on and i would like to get my 60 pounds of air in the tire.
And thanks for your input,
Glen
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#4
Glen;

If the tubes are all blowing in the same place on the face towards the spokes - there is something on the rim you need to fix. If they are blowing at random places, that is another matter entirely.

Are you absolutely certain that they are not being pinched during your installation process?

A bigger tube might help.

A thorn resistant tube (heavy) would help.
Nigel
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#5
If you're getting pnctures in random places and you've ruled out problems with the rim, pinch flats etc. and you've changed tyres, it may be that your new tyres are just a lot less puncture resistant than your old ones. In general, the lighter weight and thinner the carcass of a tyre, the less puncture resistant they will be.

I had some light weight, 330 gram, MTB tyres and while they were nice and light, they also got a lot of punctures from thorns and small sharp stones and pieces of flint. I've now fitted some mid weight tyres, around 600 grams, and only get the occassional puncture. On my commuting/shopping bike I have a set of Schwalbe Marathon Plus tyres with a puncture protection strip, at about 950 grams each they're pretty heavy, but I've yet to have a puncture.
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#6
Also take a cloth and run it on the inside of the tire to see if there are any burrs! Maybe change the manufacture name of the tube as the place you got em from has a bad batch! These are of course rare suggestions but not unheard of.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
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#7
Hello everyone. I need some assistance. I have a Fischer TRK 280, 18 speed, that I purchased in Germany and I now live in the US. I want to get some tubes for it. On my tire the size is listed as 700 x 42c 622 with a rim size of 622-19. I know that I want a tube with a Shrader valve. I don't know what American size to buy. Can someone help me?
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#8
700 x 38 - 45c S/V or similarly marked box.
Wheelies don't pop themselves. (from a QBP fortune cookie)
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#9
(09-28-2012, 11:50 PM)RobAR Wrote:  700 x 38 - 45c S/V or similarly marked box.

Is that the American size?
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#10
It's not American, German, French or anything else. It's simply Metric. You need a 700 tube that your tire width falls within the range of the next numbers. Your tire is a 42 cm wide tire. The box you find may be marked 38-45, 32-46, 38-48 - it doesn't matter. Ignore the 622-19 designation until you really want to get scientific to shave wheel weight and spend big $$. Comprende?
Wheelies don't pop themselves. (from a QBP fortune cookie)
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#11
Monica; any of these will work (and many others):
http://www.amazon.com/Avenir-Thorn-Resistant-Schrader-Valve-700x35-45/dp/B00165SA1O/
http://www.amazon.com/Sunlite-Bicycle-35-43-SCHRADER-Valve/dp/B002SG33KS/
http://www.amazon.com/XLC-Boxed-Tube-700-35/dp/B0037N64S4/
Nigel
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#12
(09-29-2012, 12:14 AM)RobAR Wrote:  Your tire is a 42 cm wide tire.

Wow! That's wider than most car tyres. I think you mean 42mm. Big Grin
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#13
(09-29-2012, 12:14 AM)RobAR Wrote:  It's not American, German, French or anything else. It's simply Metric. You need a 700 tube that your tire width falls within the range of the next numbers. Your tire is a 42 cm wide tire. The box you find may be marked 38-45, 32-46, 38-48 - it doesn't matter. Ignore the 622-19 designation until you really want to get scientific to shave wheel weight and spend big $$. Comprende?


Thank you for the explanation. I guess I should have been more specific in order to elicit this more detailed explanation. BTW I don't have 42 CM tires - :-)
(09-29-2012, 01:50 AM)nfmisso Wrote:  Monica; any of these will work (and many others):
http://www.amazon.com/Avenir-Thorn-Resistant-Schrader-Valve-700x35-45/dp/B00165SA1O/
http://www.amazon.com/Sunlite-Bicycle-35-43-SCHRADER-Valve/dp/B002SG33KS/
http://www.amazon.com/XLC-Boxed-Tube-700-35/dp/B0037N64S4/

Thank you Nigel. I greatly appreciate the links. I think my husband is making this harder than it needs be. He is the one that said that since we are back in the USA that I need an "American" sized tube.
(09-29-2012, 09:50 AM)xerxes Wrote:  
(09-29-2012, 12:14 AM)RobAR Wrote:  Your tire is a 42 cm wide tire.

Wow! That's wider than most car tyres. I think you mean 42mm. Big Grin

That is funny. Thanks for catching it. :-)
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#14
I really meant decimeters. Wink
Wheelies don't pop themselves. (from a QBP fortune cookie)
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#15
All this meter talk is making me hungry for a couple of Fig NEWTON meters hahahahah Big Grin
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
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