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Thank you for that. Really.

Is there a way to decide which tube to use, having the measurements of the frame? (the round metal part on which the tyre goes on sorry if this is not the correct expression, I am no a native speaker of English)).

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Thank you! If you know the diameter of the rim (the round metal part in your description), e.g. 600 mm, and you can assume a tire width, e.g. 40 mm, then you can search for "40-600" and find some tubes:

https://fahrrad-tools.de/tube.html?text=40-600

Thanks. This is especially the "assume a tire width" that is a problem - are there hard rules for which width is possible for X (X being something I measure)

I wonder why you focus on the tube first? Wouldn't it be easier to choose a tire for your rim first? Then you can also easily find the right tube.

Ah la la - sorry. I meant which tire of course.

My problem is that I have a rim that is there for good, and then I would like to see which tires are possible for that given rim (there are several choices of width and I do not understand what drives the minimal and maximal width - I can imagine the the brakes are a limiting factor for the maximum width, but maybe this maximum is smaller because [some measurement of something]).

Then comes the tube, thus the OP's useful page.

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