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#847596 04/30/21 10:17 pm
Joined: Mar 2007
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American Triumph
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American Triumph
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Howdy!

20" inner tubes don't seem to be a standard size...has anyone found 20" tubes for their Triumph's or are the more common 21" tubes acceptable?

Thanks!

GP


Geoff Patrick
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D
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Google this;

20 inch motorcycle inner tubes


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
desco #847618 05/01/21 1:18 am
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American Triumph
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American Triumph
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Ha! I get it...you have absolutely no idea! laugh


Geoff Patrick
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Originally Posted by Geoff Patrick
Howdy!

20" inner tubes don't seem to be a standard size...has anyone found 20" tubes for their Triumphs or are the more common 21" tubes acceptable?

Thanks!

gp


Check out Coker Tire

https://www.cokertire.com/accessories/tubes.html?tube_rimtire_diameter=568

https://www.cokertire.com/tires/styles/motorcycle-bike.html?tire_rim_diameter=2614


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


"Every time I listen to AC/DC, so do my neighbors"

1 member likes this: Geoff Patrick
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American Triumph
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I've polled a few knowledgeable folks and a majority seem to prefer using a 19" tube versus a 21" in a 20" tire. Apparently, stretching a smaller tube over a larger rim might me safer than stuffing an oversized tube into a smaller tire. The concern is that possibility of folds could spell disaster. I had a look at the Coker Tire site and they have it both ways depending on the tire width. Wider, old-car width tubes sold by Coker are spec'd for 20/21" and the narrower tubes for motorbikes are 19/20"...but not a one just for 20"!

My choice will be the 19" tube for my 20" TR5 front wheels.

Cheers! beerchug


Geoff Patrick
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Originally Posted by Geoff Patrick
Wider, old-car width tubes sold by Coker are spec'd for 20/21" and the narrower tubes for motorbikes are 19/20"...but not a one just for 20"!
My choice will be the 19" tube for my 20" TR5 front wheels.

Cheers! beerchug


I noted that too. No doubt, I would go for the 19" tube as well. I imagine you are going to go for a 3.50x19 tube?


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


"Every time I listen to AC/DC, so do my neighbors"

Joined: Mar 2007
Posts: 219
Likes: 6
American Triumph
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American Triumph
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John, I ended up using a 3.25/3.50-19 tube...thanks!


Geoff Patrick
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Originally Posted by Geoff Patrick
Jon, I ended up using a 3.25/3.50-19 tube...thanks!

Thanks, Geoff.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


"Every time I listen to AC/DC, so do my neighbors"


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