[Bedford KM]

My vehicle is currently fitted with tube type 10R20 tyres on split rims.
I have been told it is easy to replace these with tubeless 11R22.5 as they are the same size. I'm interested to do this as I plan to use the vehicle a fair bit and it would obviously be advantageous to be using a far more common/modern size.

There are 2 things I don't quite understand though.

First, my existing wheel nuts are coned, and the studs incorporate a collar to produce a coned effect on the inside also. If I fit a modern steel 22.5 rim wouldn't the holes be flat/not have an angle to mate with the coned nuts?

Second, I think I should be looking for 8.25x22.5 rims but have also come across advice that 7.50x22.5 rims are more correct for this tyre size. Which is correct or if they would both work which is more suitable?

Any help or advice would be much appreciated.