Inner Tube Sizes

[Smokin Joe]

I ordered a spare 20" tube for the trike today. The size on the tyre wall says 37-406 1.5". So I found a tube online, same size. One thing that puzzled me is what does the 37 mean? They seem to all come with different numbers from about 35 up to seventy something, if the other numbers are ok does that one matter and what the hell is it?

 

[MarquisMatsugae]

Possibly the maximum width of tyre it can be used with Joe.
I'm guessing though.

 

[Sharky]

Seems to be an ISO numbering system
Google found this
http://www.cyclinguk.org/cyclists-library/components/wheels-tyres/tyre-sizes

 

[mickle]

Width.

 

[Yellow Saddle]

Width.

In millimeters. 1.5 inches =37mm

 

[Smokin Joe]

In millimeters. 1.5 inches =37mm

Aha!!!

 

[voyager]

Word of warning there are 3 oh yes sizes of 20" tubes and tyres on the market the worst size to get now is the 20 x 1 3/4 DONT mix it up with 20x 1.75 They are completely different diameters and the rims are over an inch bigger and there is also another that was used on chinese bikes that are also becoming rare - look twice and order once !

 

[Mr Magoo]

On the subject of 20" tyres
A popular pick for recumbents two wheelers and trikes ?
This quick mini summary might help and hopefully not add to the confusion
406 sometimes known as BMX (Don't be tempted to go overwide or balloon shape to avoid interference with the often specced long cage rear mechs )
430 on early pre 1990 Euro recumbents
440 a popular and older choice with the French market
451 still used on many American recumbents and folding bikes and old school BMX albeit in narrow section (offer a usefull high pressure = 85/100psi)
451 used on early Pashley shopper trikes (latest Picadors use 406) and some trade bikes are low pressure "comfort " tyres
451 wheel chair tyres are tempting but the designs tend to be square side wall profile and most are grey rubber with a max speed rating of 12 mph !
All claim or suggest 20" but simply do not interchange
Be carefull you don't purchase Junior or Child trailer tyres with 30/40psi max pressure ratings and inferior carcase weight loadings
All of the above comments are probably why some mainstream cycle shops throw a wobbly when Mr and Mrs Recumbent ask them to supply
SJS Cycles (Thorn) and others publish online a very usefull tyre code cracker chart
99% of tyres have ratings and *codes on the side walls ......modern cycle tyres have a best used by date......so don't be tempted by cheaper old stock bargains
*just like car and motorcycles tyres
Hope that helps

 

[Smokin Joe]

On the subject of 20" tyres
A popular pick for recumbents two wheelers and trikes ?
This quick mini summary might help and hopefully not add to the confusion
406 sometimes known as BMX (Don't be tempted to go overwide or balloon shape to avoid interference with the often specced long cage rear mechs )
430 on early pre 1990 Euro recumbents
440 a popular and older choice with the French market
451 still used on many American recumbents and folding bikes and old school BMX albeit in narrow section (offer a usefull high pressure = 85/100psi)
451 used on early Pashley shopper trikes (latest Picadors use 406) and some trade bikes are low pressure "comfort " tyres
451 wheel chair tyres are tempting but the designs tend to be square side wall profile and most are grey rubber with a max speed rating of 12 mph !
All claim or suggest 20" but simply do not interchange
Be carefull you don't purchase Junior or Child trailer tyres with 30/40psi max pressure ratings and inferior carcase weight loadings
All of the above comments are probably why some mainstream cycle shops throw a wobbly when Mr and Mrs Recumbent ask them to supply
SJS Cycles (Thorn) and others publish online a very usefull tyre code cracker chart
99% of tyres have ratings and *codes on the side walls ......modern cycle tyres have a best used by date......so don't be tempted by cheaper old stock bargains
*just like car and motorcycles tyres
Hope that helps

Bloody hell

 

[classic33]

On the subject of 20" tyres
A popular pick for recumbents two wheelers and trikes ?
This quick mini summary might help and hopefully not add to the confusion
406 sometimes known as BMX (Don't be tempted to go overwide or balloon shape to avoid interference with the often specced long cage rear mechs )
430 on early pre 1990 Euro recumbents
440 a popular and older choice with the French market
451 still used on many American recumbents and folding bikes and old school BMX albeit in narrow section (offer a usefull high pressure = 85/100psi)
451 used on early Pashley shopper trikes (latest Picadors use 406) and some trade bikes are low pressure "comfort " tyres
451 wheel chair tyres are tempting but the designs tend to be square side wall profile and most are grey rubber with a max speed rating of 12 mph !
All claim or suggest 20" but simply do not interchange
Be carefull you don't purchase Junior or Child trailer tyres with 30/40psi max pressure ratings and inferior carcase weight loadings
All of the above comments are probably why some mainstream cycle shops throw a wobbly when Mr and Mrs Recumbent ask them to supply
SJS Cycles (Thorn) and others publish online a very usefull tyre code cracker chart
99% of tyres have ratings and *codes on the side walls ......modern cycle tyres have a best used by date......so don't be tempted by cheaper old stock bargains
*just like car and motorcycles tyres
Hope that helps

Where do you find the "used by date"?

 

[voyager]

most tyres have this moulded into the sidewall

 

[Yellow Saddle]

Where do you find the "used by date"?

Right next to the list of allergens in BOLD.