BM17976 is a 23 kg (50 lb) plastic coated weight and includes the necessary hardware. Install weight as shown. M71770 · Measurement (A) should be 210 mm (8.3 in.). 26x12.00-12 Tires With BM17972 Weight BM17972 is a 23 kg (50 lb) Weight. You must also order BM17977 attaching hardware when using one weight and BM18101 attaching hardware when using two weights. Install weight(s) as shown: M71770 A - One Weight B - Two Weights · Measurement (C) should be 195 mm (7.7 in.). · Measurement (D) should be 250 mm (9.8 in.). 26x12.00-12 Tires With BM17973 Weight 47