Re: Major tire problems

beginnerdad said:

My tube sprung a leak at the base of the valve stem today, due in part
to the inevitable sideways force from using a cheap stick pump. The
tube was somewhat twisted within the tire, which didn't help. The stem
hole was smooth and free of burrs on the inside wall of the rim, so
that's no issue.

The problem is that I called our local bike shops and the widest tubes
they stock are *44mm*. My Kenda Nevegal tire is 29 x 2.2 (700 x 55)and
the original Kenda tube reads 29 x 1.9/2.3 (700 x *48.26/58.42*

Any advice on what exact tube I should use as a replacement?
I'd like to get one quick, but if I have to special order to find one
suitable, that's OK.

Any particular reason you appended this to a six year old post?

The 44mm tube will work; it will just be a little thinner and a bit
more prone to flats. You can order a real 29er tube from unicycle.com
if you want to.

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My bike uses 26x2.125" tires. If I buy the tubes at Walmart or Target
that are marked for that size, they are about half as big as the tire-
that is, they have to swell way up to fill the tire. But they do, and
will work if nothing better is convenient. I think it'd be a bit
harder to patch a tube when it's used that way, the main drawback.

I've noticed that some of these Coker-type unicycles, people use
smaller tubes and stretch them over the wheel just for the weight
savings.

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StephenH
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tholub said:

Any particular reason you appended this to a six year old post?

The 44mm tube will work; it will just be a little thinner and a bit
more prone to flats. You can order a real 29er tube from unicycle.com
if you want to.

It's the closest thread I found using search.
The wider tubes 'are available'
(http://www.performancebike.com/shop/profile.cfm?SKU=23706) with Presta
valves, but I'm not familiar with them. Can they be easily adapted for
the KH29 rim?

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beginnerdad
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tholub said:

Any particular reason you appended this to a six year old post?

I'm going to assume it's because he used the Search!

Praise, praise, praise praise, praise, praise praise, praise, praise
praise, praise, praise praise, praise, praise praise, praise, praise
praise, praise!

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presta valves are skinnier than schrader valves and you need a slightly
different nozzle on your pump.

You should be able to get some sort of rubber tube to slip over the
stem so it can fit the hole in the KH rim properly.

I have been running a 700X38 tube in my 36er for 9 months now trouble
free. sizing on tubes are just suggestions 🙂

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saskatchewanian
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I agree with Eric. It's more important to remember to use a light
dusting of talc powder on the tube before installing it in the tire.
Saves a @#$%load of pinch flats!

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newer schwalbe brand tubes come with a special lock ring that locks
round the presta valve and is shaped so that it sits exactly in a
schrader valve hole.

The nicest tube for a 29er is a schwalbe tube 19a it is lightweight but
big enough to fit in a 2.3 tyre. It is way lighter than the other
29er tubes.

The problem with using the 700x44 tubes in 29er tyres is that they have
a tendency to blow out at the valve. I know bike people tend to use
26x2.2 tubes or similar if they can't get a 29er tube, because tubes
stretch okay whereas over inflating pops them.

So short term get a fat 26 tube long term get schwalbe 19a tube.
Joe

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Joe is the 19A the one reccomended for using on 36ers? My 29 tyre has
just failed, I have a 29 tube that was reccomended to me for going on a
36, will it do for my 2.1 kenda klaw?

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kington99

Dave

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kington99 said:

Joe is the 19A the one reccomended for using on 36ers? My 29 tyre has
just failed, I have a 29 tube that was reccomended to me for going on a
36, will it do for my 2.1 kenda klaw?

I think people usually use heavier tubes for the 36. Anything that
works okay on a 36 should be okay on a 29 surely, cos the 36 is
36x2.something isn't it?

Joe

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I use a 26 x 3 tube in my 29er. It's a more readily available size (DH
mountain bikes use them, and so do balloon-tire cruisers), and is
usually cheaper, too. Others in 36er threads have given the advice that
pumping up a smaller-than-the-tire-size tube and leaving it inflated
overnight will stretch it and make it easier to install, so you might
try that.

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pkittle said:

I use a 26 x 3 tube in my 29er. It's a more readily available size (DH
mountain bikes use them, and so do balloon-tire cruisers), and is
usually cheaper, too. Others in 36er threads have given the advice that
pumping up a smaller-than-the-tire-size tube and leaving it inflated
overnight will stretch it and make it easier to install, so you might
try that.

It's a good tip for just getting riding, but it really might be worth
your while trying a lightweight tube. 150g taken off the wheel is
noticeable, and the Schwalbe tube mentioned above is a relatively cheap
and painless way to lose some wheel weight.

Joe

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Haha, now it's an 11 year old uni ^.^

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Thanks to all for the advice on tube selection. As it turned out, our
nearest bike shop was pretty helpful. After looking at the 700 x
44(max) w/shrader stem and deciding it was way undersize, they found a
29 x 1.9-2.35 Bontrager tube w/presta stem and rim adapter which fit
beautifully. It's a "thorn proof" design, rather thick and heavy, but
fine for my needs.

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beginnerdad
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