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Modernising Wheels

I'm looking at mordernising the wheels on my bus (for reasons I won't go into now)
I currently have the 3 part slip rims fitted with 9.00x20 with tubes and flaps

For some reason I can never get my head around tyre and rim sizes so want to make sure I have to correct information, so I get the correct items, and not missing any vital information out.

I believe what I want is:
Single peice rims, 7.5x22.5 with a 5.6inch offset
Tyres, 10x22.5 radial tubeles

Thanks for helping advance

My bus number (if any): RMF2771

Re: Modernising Wheels

The size should be stamped into the nave of the wheel. The split rims are B6.5 X 20 H.D. with a 5.6" offset. Aspect Wheels will be able to say whether tubeless tyres require a slightly wider rim and will also be able to supply new.

What is important however is that the wheel stud holes are chamfered to accept 7/8" BSF conical wheelnuts. The wheels will also need the extra four holes to clear the brake drum securing studs. The wheels are NOT spigot mounted.