Well, it's been 30 days, and you've collected 114 views but no replies. I wonder if the folks with particular knowledge (excludes me at all levels) suppose that you will read some of the threads on changing tires (or I suppose you prefer tyres?) or wheels and find the info you need.
If I understand your intention, you want to use the turf rims from your B7100, fitting them with R1 tires (tyres?), with the proper RC for your B1502. (If I've gotten it wrong (I've had to start over twice from misunderstanding the issue), please just bail out and go the the next post!) I think that if I were someone who was knowledgeable about such things, I would suggest that you take the dimensions of your wheels to
m. e. MILLER tire and see what tires/tyres would fit. (I recommend them only because the name stuck in one of the holes in my memory and didn't fall out after I read posts by some of the experts on the site who recommend them. But maybe they'll send me a few hundred bucks when you buy the tires from them!
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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You mentioned rolling radius (it is actually RC, which it has been explained, can vary enough to be important at a given radius) -- is your B1502 an E or a DT? You prolly know that on either it's important to have a good match to reduce wear, but on the DT the bad wear is on the drive, not the tires.
Hope this helps. Good luck with this project!