What inner tube should I buy for 47 tire size, 650bx47c tires?

Question

I'm pretty new on this and want to buy a spare inner tube. These are my specifications of the tires:

Tire Size 47
Tires Maxxis DTR-1, 650b x 47c
Wheel Size 27.5
Presta valve

When I'm browsing, I see results like:

Inner Tube - 650B/27.5" - 27.5" / 1.5" / 2.4" / Presta
650x28-42 Bike Inner Tube - Presta
27.5" x 1-1/2 (650x35) Presta Tube

But I have no idea what the 1.5"/2.4", 1-1/2, etc. mean. Which one should I choose?

Vladimir F · Answer

1.5"/2.4", 1-1/2 are the tyre width ranges the tube is compatible with. Your tyre size is indicated in mm (ETRTO standard sizing), but 47 mm is 1.85" so 1.5" / 2.4" is compatible.
The 650x28-42 is for narrower tyres. 1-1/2 (650x35) (1.5 inch, 35 mm)is likely too narrow as well, although one should check the actual lower and upper limits.

What inner tube should I buy for 47 tire size, 650bx47c tires?

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