The 650R has wider ankle and middle areas. (Exactly like the 550)
For normal or narrow width feet: go down half a size from your true size. (ie: I am a true size 9.5 with regular width feet, so I buy my 650Rs in a size 9).
For wider feet: go true to size. (ie: I am a true size 9.5 with wide width feet, so I buy my 650Rs in a size 9.5).
The 650R does NOT come in wider or narrower widths
Comfort Factor Ratings:
Cushioning (Softness): 2/10
Stability (Firmness): 9/10
Cushioning to Stability Ratio: 2:9
Midsole Shape (Foot support): 2/10
Since the 650R is a retro basketball shoe from the 80's, it is NOT a comfortable shoe. (Exactly like the 550)
The retro models DO come with an OrthoLite foam insole with some added cushioning and arch support, but that's about it in terms of any comfort technology. The 650R has a hard rubber midsole with a hard rubber outsole and that's it. It may have been comfy enough for basketball in the 80's, but it's 2022 now!