BM17973 is a 33 kg (72 lb) Weight. You must also order BM18089 attaching hardware. M71770 Install weight as shown. 26x12.00-12 Tires With BM17973 Weight and BM17972 Weight BM17973 is a 33 kg (72 lb) Weight. BM17972 is a 23 kg (50 lb) Weight. You must also order BM17977 attaching hardware when using one BM17973 and one BM17972 weight. Order BM18101 attaching hardware when using one BM17973 and two BM17972 weights. Install weight(s) as shown: M71770 A - One BM17973 weight and one BM17972 weight B - One BM17973 weight and two BM17972 weights · Measurement (C) should be 200 mm (7.9 in.). · Measurement (D) should be 260 mm (10.2 in.). 48