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Heldring
700c to 650c wheel diameter. 17 arkose. 700c wheels fitted with 40c clement MSO tires are 2205.40 mm in diameter. A 50c 650b tire being the largest tire i can fit in the back of this frame would be 2148.85 mm in diameter meaning that id lose close to 2"s of wheel diameter and as a result the same in BB height. That much drop means some serious potential for stikes which id rather not even deal with, especially off road.
Given this drop why is it suggested to go with 650b?