Hey Palu,
Are you doing kids bikes too now?
I think the right size will be:
32-501 | 22 × 1 1/4 550 × 32 A
where 32 is the width as in 32mm and 501 is the diametre as in 501mm so technically you should also be able to fit 38-501 (22x1-3/8 Universal) if you have sufficient clearance.
Your best bet is SJS Cycles, I have bought weird size tyres from them before. http://www.sjscycles.co.uk/tyre-size-blog32/
@Vince started
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Hey Palu,
Are you doing kids bikes too now?
I think the right size will be:
32-501 | 22 × 1 1/4 550 × 32 A
where 32 is the width as in 32mm and 501 is the diametre as in 501mm so technically you should also be able to fit 38-501 (22x1-3/8 Universal) if you have sufficient clearance.
Your best bet is SJS Cycles, I have bought weird size tyres from them before.
http://www.sjscycles.co.uk/tyre-size-blog32/