Grove Ultra HP 5 Wl/Bk 57-124

50 Series - Grove's basic 5" wheel
51 Series - Lighter weight version of the 50 series
55, 56 & 57 Series - Same wheel as the 50 series, but with heavier discs for greater kinetic energy and larger calipers for greater braking torque.

Available in Aluminum or Magnesium.
Grove Kit Number 57-124 shown.