I guess this was in reference to my comment, maybe some references should be sought out. Instead of simple statements I am right and you are wrong, here is some reference material for what it is worth.

So you may be able to see the American Bison while impressive in size may be heavier than maybe the majority of cape buffalo but not the largest, is actually much lighter than the Asian Gaur, and much lighter than the heaviest, the wild Water Buffalo. In fact the Wisent, or Europen Bison is also generally heavier.

I would welcome disputing comments but please provide the source of the reference not simple statements as fact.

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REFERENCE MATERIAL

Source http://www.ultimateungulate.com

American Bison
Body Length: up to 380 cm / 12.5 ft
Shoulder Height: up to 195 cm / 6.5 ft.
Tail Length: 90 cm / 3 ft.
Weight: 545-818 kg / 1200-1800 lb.

Gaur
Body Length: 250-330 cm / 8.3-11 ft.
Shoulder Height: 170-220 cm / 5.6-7.2 ft.
Tail Length: 70-100 cm / 28-40 in.
Weight: 700-1000 kg / 1540-2200 lb.

Cape Buffalo
Reported measurements for African buffalo (Syncerus caffer)
Source / Adult Weight / Head & Body Length / Shoulder Height / Tail Length
Alden et al., 1995
(for S. c. caffer)
500-700 kg 240-340 cm 140-160 cm-
Alden et al., 1995
(for S. c. nanus)
265-320 kg 180-220 cm 100-130 cm
Buchholtz, 1990
265-680 kg 220-340 cm 100-170 cm 70-110 cm
Kingdon, 1997
250-850 kg 170-340 cm 100-170 cm 50-80 cm
Nowak, 1991
300-900 kg 210-340 cm 100-170 cm 75-110 cm

Wisent - European Bison
Body Length: 290 cm / 9.6 ft.
Shoulder Height: 180-195 cm / 6-6.5 ft.
Tail Length: 80 cm / 2.6 ft.
Weight: 800-1000 kg / 1760-2200 lb

Water Buffalo
Reference: San Diego Zoo
Weight: heaviest—Asian water buffalo Bubalus bubalis, 1,500 to 2,600 pounds (700 to1,200 kilograms)