A2

91 Tooth Sprocket for #410 Chain with ISO Mounting Pattern Made from Tempered (Hardened) Aircraft Grade Aluminum Alloy91 TeethFor #410 (1/2"x1/8") Bicycle ChainISO Disc Brake Rotor Mounting Pattern44mm Bolt Circle Diameter35.5mm BoreSix 5.5mm ID Bolt Holes Equally Spaced @ 60 Degrees

24 Tooth Sprocket for #41 and #420 Chain Made from Aircraft-Grade Tempered (Hardened) Aluminum Alloy For #41 and #420 Chain 24 Teeth F5 Mounting Pattern 4.6" OD 2.13" ID 2.6378" Bolt Circle Diameter Five 5.25mm ID Mounting Holes

70 Tooth Sprocket for #428 Chain Made from Aircraft-Grade Tempered (Hardened) Aluminum Alloy 70 TeethFor #428 Chain2" BoreFour 3/8" ID Bolt Holes2.875" Bolt Circle Diameter

80 Tooth Sprocket for #428 Chain Made from Aircraft-Grade Tempered (Hardened) Aluminum Alloy 80 TeethFor #428 Chain2" BoreFour 3/8" ID Bolt Holes2.875" Bolt Circle Diameter

90 Tooth Sprocket for #428 Chain Made from Aircraft-Grade Tempered (Hardened) Aluminum Alloy 90 TeethFor #428 Chain2" BoreFour 3/8" ID Bolt Holes2.875" Bolt Circle Diameter

38 Tooth Sprocket for #41 and #420 Chain Made from Aircraft-Grade Tempered (Hardened) Aluminum Alloy For #41 and #420 Chain 38 TeethF5 Mounting Pattern 6" OD 2.125" ID 2.638" Bolt Circle Diameter Five 5.25mm ID Bolt Holes

44 Tooth Sprocket for T8F (8mm) Chain with G1 Mounting Pattern Made from Aircraft Grade Tempered (Hardened) Aluminum For T8F (8mm) Chain 44 Teeth G1 Mounting Pattern 2" ID Four 0.375" (3/8") ID Bolt Holes 2.875" Bolt Circle Diameter

82 Tooth Sprocket for #41 and #428 Chain Made from Aircraft-Grade Tempered (Hardened) Aluminum AlloyFor #428 Chain82 TeethF5 Mounting Pattern2.125" ID2.638" Bolt Circle DiameterFive 5.25mm ID Bolt Holes

90 Tooth Sprocket for T8F (8mm) Chain with G1 Mounting Pattern Made from Aircraft Grade Tempered (Hardened) Aluminum For T8F (8mm) Chain 90 Teeth G1 Mounting Pattern 2" ID Four 0.375" (3/8") ID Bolt Holes 2.875" Bolt Circle Diameter

36 Tooth Sprocket for #40 Chain Made from Aircraft Grade Tempered (Hardened) Aluminum Alloy For #40 Chain 36 Teeth F4 Mounting Pattern 6" OD 54.1mm ID Bore Four 6.2mm ID Bolt Holes Equally Spaced @ 90 Degrees 65mm Bolt Circle Diameter Fits 4-Hole Freewheels Item # FWM-120, FWM-125, and FWM-175 Fits 16-Tooth Freewheels Item # FWM-100, FWM-160, and FWM-180 ...

26 Tooth Sprocket for #41 and #420 Chain Made from Aircraft Grade Tempered (Hardened) Aluminum Alloy For #41 and #420 Chain 26 Teeth F4 Mounting Pattern 54.1mm ID Bore Four 6.2mm ID Bolt Holes Equally Spaced @ 90 Degrees 65mm Bolt Circle Diameter

44 Tooth Sprocket for 1/2" x 1/8" (#410) Bicycle Chain with G1 Mounting Pattern Made of aircraft-grade tempered (hardened) aluminum alloy.44 teeth.For 1/2" x 1/8" (#410) bicycle chain.2" ID2.875" bolt circle diameter.Four 0.375" (3/8") ID bolt holes.