Tube advice needed PLS

[2-wheels]

I have a tyre on my bike which says 28 x 1 5/8 x 1 5/8. It also has 37-622 on the tyre. I am not sure what the last 1 5/8 or 37-622 actually means the closest tube i can find on Ebay is something like http://www.ebay.com.au/itm/Bike-Cycle-T ... TdZX_cyJjA but I am not sure it would fit. Anyone got any pointers to the correct tube for this tyre?

[darkhorse75]

28 x 1 5/8, 37-622, 700c-37 are all different ways of writing the same thing. You need a tube for 700c wheels that fits a tyre with a nominal width of 37mm. something designated 700 x 28-37 or 700 x 32-47 will fit. Just make sure you get the correct valve type for your rim, Schrader valve is like the valve on a car tyre, Presta is the other one. To complicate things more presta valves come in a variety of lengths to suit the depth of your rims.

[2-wheels]

Thanks for clarifying. I will measure the length of the current presta valve before purchasing one

[ValleyForge]

"1 5/8" is the older inch method of measuring the tube cross-section. "37-622" is the ETRO which represents a more modern description.
Make friends with your LBS. They make a few dollars on tubes. If the staff have a beard - use the ETRO. If they don't then specify inches.

[Duck!]

The ETRTO/ISO measurement - in this case 37-622 - is the most accurate expression of tyre size, therefore the least used....

Explanations:

ETRTO/ISO: 37-622. 37 is the width of the tyre. 622 is the diameter of the rim at the internal base of the sidewalls, where the tyre bead seats on the rim. Both measurements are in millimetres.

700c: The French system, with a nominal overall diameter of 700mm, and the "c" originally indicating a wide-ish tyre on a 622mm rim. 700a and 700b used narrower tyres on larger rims, to still have an approximately 700mm overall diameter, while 700d was a wider tyre on a smaller rim. Only the 622mm rim survives in common use, yet is still called 700, hybridised with ISO tyre widths, despite tyres frequently NOT being 700mm diameter.....

Northern European: 28 x 1 5/8 x 1 5/8". Odd, given the tyres are smaller than 28" diameter, and not to be confused with the larger English 28" tyres & wheels..... Unlike most measurement systems which are two-dimensional (diameter x width), northern European gives three-dimensional measurements, with tyre profile height being the third measurement.

You're best off NOT asking for 28" when you visit a bike shop, because you'll either just be looked at blankly, or looked at bemusedly and told "that went out with the Ark" or words to that effect, because to anyone old enough to remember it, 28" will automatically mean the aforementioned larger English 28".

Go figure.....

Stick to 700 x .., despite its inaccuracy it's the most commonly used system here.

[ironhanglider]

Of course to further add to the fun, 29" tyres fit onto 700C rims, but even if you wanted to you can't use them in UCI races because the overall diameter would be more than 700mm. (ARTICLE 1.3.018)

Cheers,

Cameron