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Tannus armour insert.
Curious if it will change the handling significantly. Also if they affect how much weight can be supported.
MCamb-
AAMOI, Is there no rim that is more aimed at cargo than Andra40?
btw, I noticed a comment from Dave Whittle at SJS/Thorn (on the Thorn forum somewhere) that they’d discovered that the wider walls of Andra 40 were thinner than Andra 30. He may have been talking specifically about the spoke bed wall, I don’t know.
Maybe you could try those, or Big Bull, to see if you get the same cracking?
Skülly
I have noticed that with ryde rims. Kot always the best finished. The rim would need a new extrusion die and possibly should be deeper. Deep rims flex less under load. It might also be the material.
Another way of dropping tyre pressures is using an Tannus armour insert.
The 50 psi needed without is probably reduced to 30 psi.