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What are you using at the moment? Schwalbe have a new cargo-specific tyre which comes in a couple of widths of 406
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Not helpful due to the size, but I'm giving these a go.
https://www.magliner.com/10-inch-x-2-inch-interlocked-microcellular-foam-wheel-111070
I'm building a trailer that will have a wide base with a low cg.
Hand truck wheels also come in slightly bigger sizes, or even wheelbarrow ones might be an option.
Regarding tyres for bike trailers:
Getting punctures is really a massive pita, especially if the trailer is fully loaded.. hard to fix and can be dangerous depending on where it happens. Often ruins the rim too.
I was looking at a few solutions to minimise the chances:
Tannus under armour- basically a liner sits in between the tyre and the tube, also protects the sidewall a bit
Getting 16” moped / scooter tyres. I’ve read they will fit on 20” (etrto 406) rims. Anyone had any success with this? They would roll slower and be heavier but I’m hoping there would just be so much rubber there they would be pretty impervious to road debris, I imagine they would have decent sidewall protection too.
Filling the tubes with OKO tyre sealant (can double down and do this as well as the options above too).
Would appreciate any input- particularly on whether I can get moped tyres to fit on the bmx rims!