Originally Posted by
Jipe
Yes, true and there are also several touring tires (meant for cargo bikes with ETRTO507 wheels) but all 50mm wide or more.
What is missing is 40mm wide or less high performances tires (there was a Schwalbe Kojak with decent performances when the Helix project was started in 2015, but that size was discontinued by Schwalbe), its the reason why Helix asked a small company to make a special narrow lightweight tire for Helix but, as far as I know, its only available from Helix?
Note also that most BMX tires since they are not meant to be used on open roads have a limited puncture resistance.
I have about four or five spare 507X40 tires, so not buying any more as I think I have a lifetime supply for my Airnimal.
But a quick search found that Airnimal lists a Kenda K-West 507X40 on one of their bikes, my folder is a much earlier version of this bike model that I built up with drop bars:
https://airnimal.co/products/joey/commute
Found that tire at a few suppliers, but would involve tariffs to import them.
And some years ago I bought some Intense tires as spares, have not installed them yet. But a five minute internet search tells me that the company that made Intense is long gone.
So, looks like 507X40 is extremely rare with only one tire model available, that is from Kenda.