Originally Posted by
JiveTurkey
ERD (effective rim diameter) is the diameter, in mm, of the circle made when measuring where the spoke nipples sit. Since both rims have the same ERD, if their respective hubs at the same dimensions, then the spoke lengths would be the same. This is independent to tire size.
BSD (bead seat diameter) is the diameter, in mm, of the circle where the tire's beads sit. Since the BSDs are different, they take different sized tires.
Since the ERDs are the same, but the BSDs are different, one of the rims (the 700c) will have a much deeper rim depth than the 26" rim.
Can you explain to me why someone make a set of wheels that have a 700c in the front and 26 in the rear? I bought these second hand, and as you can tell, I didn't know what I was buying. Would you share with me a catchie marketing phrase so I can try to sell these? If the rims are different, I guess the 700c wont fit on my MTB fork..?