Thanks for all the help gang. Went with the Race Face Arc 35 .

Thanks Sigma. I hadnt seen those before. On the website  https://www.ryde.nl/trace-m-35  it describes the rim as being meant for use with b plus tyres. What does this mean. Also in the description it says it comes with ofset but in the specification table it has the offset as zero. Any idea what this means. Otherwise it seems to fit the bill regarding suitability of tyre sizes.

Thanks for the input. I need a symetrical rim with the rohloff, one of its advantages being it doesnt produce a dished wheel. There dont seem to be many 36h options available, even fewer here in the UK. Ive looked at the Velocity Blunt 35 and Dually but neither are a true tubeless rim. The race face ARC 35 or 40 look good but there seem to be some question over durability and durability is the prime quality im looking for rather than light weight.THE SUNRINGLE duroc 40 only seems available on a complete wheel. Any others i havent found yet.

Hi. Im slowly building up a Surly ECR from a bare frame for a long trip taking in The Great Divide , Baja California and on to South America. Can you Recommend a 29 rim that will be both suitable for plus tyres and , should the need arise, 2 inch tyres in South America. Disc hub front, Rohloff hub rear.  Which would be better to go for, 32 or 36h rims. Ally not carbon and genuine tubeless prefered. Thanks