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Not bought any inner tubes for yonks and never for 700c's, new ebike so sturdy ones I guess.
Tyre width? Valve length/type?
Local bike shop.
Does it not already have tubes in it?
If you can, take to the local bike shop -brands such as Schwalbe, Maxxis and Continental hold pressure for longer than cheaper brands.
If you can’t then -
Establish valve type, Presta is thin with a small valve top that you unscrew before inflation. Schraeder are the car type ones.
Measure the valve length - standard are normally around 40 mm but can go to 80mm on deep rims. Occasionally on a new bike valves are fitted that are too long or short, both of which make fitting or inflation difficult so you might have to get advice.
Next, and most importantly, look on your tyre sidewall to establish the size. There will be several different markings - metric, imperial and ERTO which will look something like 32-622. The ERTO number is often the most accurate to purchase replacements - otherwise the 700 x 32c type figure (insert your own width x 32 is an example).
Hope this helps.
Cheers, lazy evening post....
I'll have a look at tyre tomorrow, good call on the deep rims btw.
wheel size is 47-622 so 1.75" x 700, forgot to measure the rims but from memory they look around 40mm deep so guess I'm looking at 60mm valves?