4B 1N they did that for XC Racing...I stuck on some Duner Tires for the Front with 3B 2N and they actually make the Quad much more stable in the dunes...
N = Nose the side of the wheel that goes to the outside
B = Bell is the part that sticks to the inside over the caliper and it is usaully bigger than the outside or Nose hence it is called the "Bell"
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