Replacing 10.00R20 Split Rims

[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.

[Bush mechanic]

The mounting methods you describe as coned or flat determines the way the wheel is centered on the hub.

Coned = stud centered, the wheel nuts ensure the wheel is centered on the hub and hold the wheel on.

Flat = hub centered, the center hole in the wheel fits neatly onto a boss on the hub and the wheel nuts 'only' hold the wheel on.

It is possible to have hub centered wheel nut holes machined to accommodate stud centering but you must ensure the tapers match perfectly otherwise the nuts WILL come loose.

Also you have to ensure the center hole has adequate clearance.

The biggest problem is finding wheels with the correct pcd otherwise they will have to be made from blanks.

I had this problem once and it was easier to change to spider hubs to allow fitting of tubeless tyres.

Good luck
Peter

Good