Inner Tube Question

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logie48
Posts: 27
Joined: Wed Oct 17, 2012 10:04 am

Inner Tube Question

Postby logie48 » Fri Feb 08, 2013 18:20 pm

Hi,

I went and bought a Conti Race 28 inner tube (and 4 season tyres) to fit on my cyclocross. But when I went to change it, the inner tube is massive in diameter compared with my wheel.

Had a 700 x 35 tyre and tube on it, but the conti 700 x 20-25 doesn't look as though it fits.

Anyone know the issue; wrong size?

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wishitwasallflat
Posts: 2809
Joined: Wed Aug 31, 2011 11:10 am

Re: Inner Tube Question

Postby wishitwasallflat » Fri Feb 08, 2013 18:28 pm

700 20x25 is for a 700 wheel and a tyre with diameter 20-25mm - if you had a 700 35 tyre on it and it fitted it must be a 700 wheel so the tube will fit. Have you by any chance inflated it a bit to fit it? It is a good thing to do - as it helps you a bit to handle the tube as it goes on the wheel - but if you overdo it even slightly the inner tube gets very big (no restriction placed by being inside a tyre). Could that be the issue?

logie48
Posts: 27
Joined: Wed Oct 17, 2012 10:04 am

Re: Inner Tube Question

Postby logie48 » Fri Feb 08, 2013 18:44 pm

I tried to inflate it. I managed to get the tube in the tyre, but even felt as though the tyre was too big aswell. I couldn't tuck it in. My bike is a boardman CX team. I put the old tyre back on and it fit like a glove.

Image.

Image

troj
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Joined: Mon Apr 06, 2009 12:51 pm

Re: Inner Tube Question

Postby troj » Fri Feb 08, 2013 19:03 pm

You need to match your tyres with appropriated tube sizes. ie the tube and tyre in the second picture will work but a cyclocross tyre (35mm) won't work with a tube rate as 20-25mm.

logie48
Posts: 27
Joined: Wed Oct 17, 2012 10:04 am

Re: Inner Tube Question

Postby logie48 » Fri Feb 08, 2013 19:10 pm

troj wrote:You need to match your tyres with appropriated tube sizes. ie the tube and tyre in the second picture will work but a cyclocross tyre (35mm) won't work with a tube rate as 20-25mm.


Yeah. The 2nd picture has the 20-25 tube going into the 25 tyre. But my previous 35 tyre had a 35 tube in it. It's the diameter thats the prob. It looks about 30 cm too long, and the tyre wasn't a tight fit either. It also varies in thickness when there is a bit of air in it. The tyre fits, i've got that sorted.

Image

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Bobbinogs
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Re: Inner Tube Question

Postby Bobbinogs » Fri Feb 08, 2013 20:17 pm

I sincerely hope those slippers have got cleats fitted.

logie48
Posts: 27
Joined: Wed Oct 17, 2012 10:04 am

Re: Inner Tube Question

Postby logie48 » Fri Feb 08, 2013 20:57 pm

Bobbinogs wrote:I sincerely hope those slippers have got cleats fitted.


By the way...those are not slippers :shock: . They are my Saturday night dancing shoes :lol:

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wishitwasallflat
Posts: 2809
Joined: Wed Aug 31, 2011 11:10 am

Re: Inner Tube Question

Postby wishitwasallflat » Sat Feb 09, 2013 19:07 pm

That looks not too bad to me for a (little bit over) inflated tube on a wheel with no tyre.

Fit the tyre first, work round it to tuck in only one bead (so one side of the tyre is in and one is out of the rim) - then slot the tube valve through the valve hole and tck the tube up inside the tyre and onto the rim - if the tube is inflated there well seem to be a bit of extra tube length but let out a little air and try to spread it round the rim inside the tyre evenly. I find at that point the tube slots in nicely even though it looks too long before that. Then carefull tuck in the other bead of the tyre being especially careful not to trap tube between tyre bead and rim edge. It helps to make sure both tyre beads are in the centre of the rim as its a little lower there on nearly all wheels which helps get that little bit extra you need to tuck in the last bit of the bead. Once its in check all round the wheel to make sure the tube is inside the tyre and none of it is going to get trapped under the tyre bead and inflate - chekc round the tyre is seated properly and - job done!


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