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Has anyone Stretched a 20" tube to fit a 24" wheel?



 
 
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  #1  
Old December 24th 08, 04:38 PM posted to rec.sport.unicycling
UniKid2
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


Has anyone ever thaught of stretching a 20" tube to fit a 24" wheel? Its
highly common to size a 29er tube to a 36er wheel. Does anyone have some
sort of guide on stretching tubes? My MUni is a beast and I figured ti
was time to put him on a very strict diet

Clichée came to me at 12:13 am on X-mas eve. So I typed it up on my
Ipod so I dont forget.

Happy Holidays!

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  #2  
Old December 24th 08, 04:50 PM posted to rec.sport.unicycling
harper
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


I have never tried stretching tubes. To stretch a 20" tube to fit a rim
for a 24" tire you are only asking for an additional 20%. To stretch the
29" tube to fit a rim for a 36" tire you are asking for an additional
24%. If anything, it should be easier to do. It certainly is a cheap
experiment. I question the weight savings. A Coker tube is very heavy so
the weight savings are substantial.If you are using one of the thick,
downhill tubes in your 24", just going to a standard 24" tube might save
you enough in weight already.


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  #3  
Old December 24th 08, 04:52 PM posted to rec.sport.unicycling
jtrops
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


I think it's gonna be a tough fit. There is quite a bit more rubber to
stretch in a 29" tube than there is in a 24". If your goal is to drop
the weight a little I think a lightweight tube in the right diameter
would be better. You could try a cheap 25x1.5-1.75 tube. It should
only cost three bucks, and it would be lighter than a tube made for a
2.5-3.0 tire.


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  #4  
Old December 24th 08, 06:48 PM posted to rec.sport.unicycling
Biggestbtc
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


From my experience, stretching a 26" tube to fit a 27" wheel(bicycle)
was quite difficult. Later I remembered that for every inch of
diameter, you have pi inches of circumference. That means that my 26"
tube was 3.14 inches shorter in circumference than a 27" tube.

That also means that with a 20" tube, you will have over 12" less tube
to work with then if you used a 24" tube. I wouldn't even try, but
maybe it is possible.


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  #5  
Old December 24th 08, 06:48 PM posted to rec.sport.unicycling
harper
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


harper;1157042 wrote:
I have never tried stretching tubes. To stretch a 20" tube to fit a rim
for a 24" tire you are *only asking for an additional 20%*. To stretch
the 29" tube to fit a rim for a 36" tire you are asking for an
additional 24%. If anything, it should be easier to do. It certainly is
a cheap experiment. I question the weight savings. A Coker tube is very
heavy so the weight savings are substantial.If you are using one of the
thick, downhill tubes in your 24", just going to a standard 24" tube
might save you enough in weight already.




Oops. Sorry. You're asking for an additional 25% in this case so it's
about the same as the 29er stretch. I still agree with jtrops that a
lightweight 24" tube would probably be effective enough.


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  #6  
Old December 24th 08, 07:09 PM posted to rec.sport.unicycling
phil
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


I've stretched a 20"x2" tube over a 24" muni rim in order to tubelessify
my muni; it was a bit of a tight fit, and I must confess to half
expecting it to go BANG as I inflated it to seat it properly. It wasn't
too difficult to get on but even at low pressure it looked strained and
a bit thin in places; I don't think I'd have liked to ride on it
(assuming it could have been inflated to riding pressure in the first
place!)

Get some sealant and go tubeless instead, it's awesome - no more
punctures, lighter, and much better bump-absorbing properties...

Phil


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  #7  
Old December 24th 08, 07:27 PM posted to rec.sport.unicycling
johnfoss
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


UniKid2;1157037 wrote:
My MUni is a beast and I figured ti was time to put him on a very strict
diet


This sounds like a diet for a flat tire. I recommend trying the tubeless
route, or shopping for lighter tubes. Regular 24" tubes don't weigh that
much in the first place so it's not a great place for savings. You could
save a lot more rotating weight by choosing a lighter tire and/or rim.


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  #8  
Old December 24th 08, 07:32 PM posted to rec.sport.unicycling
phlegm
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Default Has anyone Stretched a 20" tube to fit a 24" wheel?


harper;1157042 wrote:
I have never tried stretching tubes. To stretch a 20" tube to fit a rim
for a 24" tire you are only asking for an additional 20%. To stretch the
29" tube to fit a rim for a 36" tire you are asking for an additional
24%. If anything, it should be easier to do.




I don't know that it scales. I tried using an 18" on a 20" freestyle
rim once--only ~11%. Everything seemed okay, but then it exploded while
I was getting ready to go ride.


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