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Me.
Alex Supra 26" is sup welded joint, very high quality alloy, was their 26" DH/Enduro rim from back in the day. Rigida/ Ryde do a 26" of solid quality aswell, not quite as good an alloy and pin jointed, but they are heavy load rated and built about 4 of them now which haven't immediately exploded during cargo use!
DT don't make anything decent in 26", there is the old 533d, but only in 32h I think, they are OK for about £25/30 but the Alex Supra is better.
Spokes, yeah get some Sapim strong from Ryan, not sure if e-strong (which are a grade beefier) will fit in a Nuvinci, but I know Saprim strongs definitely do fit and work well.
Does anyone have recommendations for a wheelbuilder for cargo bike wheels?
I have ordered a replacement rear hub from Enviolo (as my Nuvinci N380 has done its time) - went for the EXTREME hub: https://orders.enviolo.com/collections/hubs
I have personally enjoyed my time with the N380 - not sure why it gets a lot of stick from everyone.
I need a strong 36h rim 26"and a the strong Sapin spokes.
I have used this company to get spokes in the past but it's a bit of a pain to send it all there & back tbh:
https://www.spokesfromryan.com/