20" inner tube

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klaus gerhard
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20" inner tube

Postby klaus gerhard » Sun Mar 09, 2014 11:39 pm

Hello,
I want to renew the innertube of the 20" front wheel of my '51 NH. Where are innertubes of that size available?
Thanks and
Kind Regards
Klaus

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Bob.Murphy
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Re: 20" inner tube

Postby Bob.Murphy » Sun Mar 09, 2014 11:51 pm

klaus gerhard wrote:Hello,
I want to renew the innertube of the 20" front wheel of my '51 NH. Where are innertubes of that size available?
Thanks and
Kind Regards
Klaus


Klaus,

Inner tubes are quite forgiving and a 21 inch will fit a 20 inch tyre. Have a look at the Draganfly site here:

http://www.draganfly.co.uk/index.php/ariel/ariel/4-stroke/category/712-tyres

They are saying that their 'MA21' inner tube will fit a "250/300 x 20 & 21" tyre. I'm not sure how that would go in a 3.25 or 3.5 inch tyre but making it fatter will reduce its diameter so it might be OK.

I'm sure someone here will have practical experience of this :) .

Hope this helps.

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

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Bob.Murphy
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Re: 20" inner tube

Postby Bob.Murphy » Mon Mar 10, 2014 12:01 am

Me again ;) ,

The Devon Rim Company advertise an inner tube that fits both 19 inch and 20 inch rims - here:

http://www.devonrimcompany.com/tyres-and-inner-tubes/inner-tubes/19-inner-tubes

Cheers.

Bob.
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Re: 20" inner tube

Postby Knud.Degnbol » Mon Mar 10, 2014 7:23 am

After all, inner tubes are made from rubber, so they can always be stretched a little. Like using a 19" tube in a 20" tyre.
It might be dangerous if used the other way round. They might wrinkle.
If the maker claims that a tyre can be used in two different sizes of tyre, he has probably made it for the small one.
Knud

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Postby ian.scott » Mon Mar 10, 2014 8:06 am

The Vintage Tyre Company in Beaulieu in the New Forest were stocking them last year.

Ian

klaus gerhard
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Re: 20" inner tube

Postby klaus gerhard » Mon Mar 10, 2014 9:40 am

Dear all,
I understand fitting a 19" innertube might be the best alternative. They are easy to get.
Thanks everybody for your help.

Kind Regards
Klaus

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Wali.Badger.Taylor
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Re: 20" inner tube

Postby Wali.Badger.Taylor » Mon Mar 10, 2014 9:53 am

I would rather use a 19 than a 21. A tube will stretch evenly but not scrunch up evenly.

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Bob.Murphy
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Re: 20" inner tube

Postby Bob.Murphy » Mon Mar 10, 2014 6:34 pm

Wali.Badger.Taylor wrote:I would rather use a 19 than a 21. A tube will stretch evenly but not scrunch up evenly.


It all depends on the width of the tyre. The Draganfly 21" was for a narrow tyre, putting it in a wider one will reduce the diameter of the circle (the material has to come from somewhere) so I would expect a 21" tube in a 20" rim with a 350 tyre to be OK.

Theory is all very well, but I'd like to see what happens in practice ;)

Bob.
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Eero.Korhonen
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Re: 20" inner tube

Postby Eero.Korhonen » Tue Mar 11, 2014 5:31 am

Hello,
Is it true that Ariel used 19" rim in front in export models?
I have been told that is was like this, because it was hard to
find 20" tyres out side U.K..
Br, Eero
Ariel VH 1954, IZH 350 1962, H-D Sportster Hugger 1992, AOMCC Member 133

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brenton.roy
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Postby brenton.roy » Tue Mar 11, 2014 6:32 am

Hi Eero,
No - not true for the bikes exported to Australia. They have the usual mix of 19" and 20", depending on the model.
'51,'56 Squares, '48 VH, '27 Model C, R67/2, Mk IV Le Mans, '06 Super Duke and Ariel projects.


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