Bicycle chainwheel
BM-172 
1/2" × 1/8", 32T × 5" Black Three holes.
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Bicycle chainwheel
BM-173
Cotter less Crank with PVC Spider
3/32" × 1/2" × 36T × 125mm
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Bicycle chainwheel

BM-154 (DOUBLE SPROCKET)
Chain wheel crank set cottered /
cotter less BNCP / powder coated with chain guard
52T-42T  x  1/2" x 3/32" or 48T-40T x 1/2" x 3/32". 
Crank length 6¾" / 6½". Threads,
14, 28 x 20 TPI W.W. 14 x1.25mm
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Bicycle chainwheel
BM-151A  (Three speed) 
With Black Guard & Grey Plastic coated Crank.
Wheel Sizes: 28T-38T-48T
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