Any good explainations of tractor sizes?

[orlo]

Hi:

Does anyone have a link to a good explaination of all tire sizes? For example, on a 3000 series the larger R4's are 43x16x20 in which the 43 makes sense (outside diameter) and the 16 is the width but what is the 20?

Now compared to the smaller R4's that just are listed as 15-19.5 what are these dimensions so that you could compare them?

 

[dsgsr]

43x16x20, 20" wheel/rim. 15x19.5 15in wide 19.5 wheel/rim.

David

 

[orlo]

Thanks. So the tires that list only two dimensions don't disclose their outside diameter. Makes comparing them kind of difficult... ;(