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My brother is looking at a Haibike trekking 1.0 and wants to know if getting tyres for it will be an issue.
I've not got a clue , make me look clever please.
From a quick Google seems to be a fairly standard touring size with plenty of available options. Halfords have 57 options (sorry for swearing)
medium large
Halfords have 57 options
Isn't that Heinz?
So, back in the real world they are adifferent size to a 700 /29?
Check the ISO size … xx-622 is what you’re looking for… there have been multiple 28” (and 26” and 27”) sizes across the world over the years.
Schwalbe, Road Cruiser , 42-622, 28" x 1.60"
TYRE
Schwalbe, Road Cruiser , 42-622, 28" x 1.60"
https://www.haibike.com/gb/en/electric-bikes/electric-trekking-bikes/sduro-trekking-10-gb812
Edit: JINX !
It says 42-622
Too late!
So, the answer to your question is… yes.
28" in germany is usually what we call 29" ie a wide 700c tyre
The French being metric refer to a wheel with 622 mm diameter rim as 700c, presumably as wheel plus tire diameter is about 700 mm. As the French used to more or less command the world of road bikes we tend to refer to road wheels of this size as 700c.
The British used to use several sizes of wheel about 27 inch diameter but with subtly different rim diameters that confused everyone so they gave up and copied the French using 700c.
The Americans being odd and old school in their measurement system refer to a wheel with rim diameter 622 mm and a mountain bike tyre as 29 inch as the is the approximate diameter of wheel and tyre.
The Germans being metric use 622 mm diameter diameter rims but like nice sensible 40ish mm diameter tyres on their town and touring bikes. Naturally they refer to these metric tyres on metric rims as 28 inch to confuse the hell out of everyone.
I think that's more or less right, if not entirely clear.
28" is the same rim diameter as 29" but both are smaller than 27". Quite simple really.