Strangely enough the SJS web site says that Andra 40 rims are suitable for 37 - 62mm tyres…….the same max tyre size as Andra 30 rims.

My complaint about the Andra 30 rims being pushed as a great expedition rim for wider tires like 57mm is that if I want to be able to lower the pressure for bad ground conditions, the rims are narrow enough that the bike feels too loose if I do that.  I only did it once and did not like the feel of the bike.  Thus, I feel I have to run the pressure higher than I would like on loose uneven ground on those tires because the rims are too narrow.  Too many times on steep uphills on loose gravel, my rear wheel lost traction and spun out and I came to an immediate halt.  And those hills are too steep for me to just get on the bike and be able to pedal up to speed with a full load, thus I had to push the bike up the rest of the hill.  But with lower pressure I am pretty sure that I would have had better traction with a larger tire footprint on the loose ground.

One of the times when I was ranting about this on this forum, Dave W (former SJS employee) told me I was completely wrong because the rim was good for up to 62mm.  But all he could say was that Ryde said so.  I think realistically, when manufacturers recommendations are too broad, the retailer should be willing to accept that.  I do not think any other rim manufacturer of a 19mm wide (internal) rim would suggest all the way up to 62mm.

Example, on my Lynskey I am running Velocity Dyad rims, I wanted a rim that would work well with 28 to 37mm tire width.  I considered the Mavic A719 and Velocity Dyad. 

In the end I picked the Dyad.  Rim internal width is 18.6mm, just a hair under the Andra 30 width.  Velocity recommends this rim for 25 up to 38mm tire width, which makes it just perfect for my tire preferences on my Lynskey.  That is a much more realistic appraisal of which rim would work best with which tires. 
https://velocityusa.com/collections/rims/products/dyad-rim-700c?variant=40783718350927

I had nothing against the Mavic A719, internal width of 19mm (same as Andra 30).  I already had owned a set of wheels with those rims.  Attached photo shows the max pressure recommendations from the sticker on one of my A719 rims, as you can see this rim was right in the range of tire sizes I wanted on that bike.   At this time my randoneuring bike has a Dyad (18.6mm internal width) on the front and a Mavic A719 (19mm internal width) on back, works great with 32mm wide tires.

I will never understand why Ryde says what they say for ideal rim width.

I wanted to run tires in the range of 40 to 50mm on my Sherpa.  I bought Salsa Gordo rims (no longer sold) with an internal width of 21mm, and they work great on that bike with that range of tires.

Rant over.  Sorry.  But this topic is the only topic where I have been unhappy when I followed the recommendation from SJS.

Strangely enough the SJS web site says that Andra 40 rims are suitable for 37 - 62mm tyres…….the same max tyre size as Andra 30 rims.

15g is negligible; I had incorrectly assumed an Andra 40 rim would be significantly heavier than an Andra 30.

The Mavic 717 rims originally fitted are lighter by around 250 - 300g than the Andras, as are the Halo rims PH mentioned.  And visually I do not like the square section of the Andras, but that is a minor consideration.  They certainly seem to have a good reputation for strength and having Rohloff drillings is a positive.

I dropped into SJS today - my cheapest ever visit as I only left with a £1.39 straddle cable.  They seem to have the world supply of 26” Andra 30 rims!   They bought a big batch in at some point and currently have good stock.  Whether they will ever order another batch who knows……and I did not ask what ratio of Rohloff / standard drilled 26” rims they had.

Their website says that Andra 30 rims will take 28 - 62mm tyres.  Personally I don’t think I will ever fit larger than 50mm so the Andra 30 would be fine for me - but Martinf in a post above is considering Andra 40 rims.  The negative is that no doubt Andra 40 rims are heavier than Andra 30.

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Rohloff spokes have always come with Polyax nipples, though they've recently changed to the new locking version, which is still Polyax.  They're an interesting idea, I think it deforms the thread, it seems mainly an advantage for machine built wheels, they're also aluminium which puts me off.

I was not aware of locking nipples.  But I have never had a problem with nipples loosening.

If I needed to change a spoke or for some other reason remove a nipple, I would rather have the plain old nipples. 

I would never want aluminum nipples.  If I was a pro racer, I could understand the interest in aluminum nipples, but not interested in them on a touring bike wheel.

I added the flange rings to my Rohloff hub several years ago, I had to remove and reinstall half of the nipples to do that.