Chop Saw Chainring from Porkchop BMX for BMX and other single speed bicycles - classic styling, modern quality, and made in the U.S.A. * Model: Chop Saw I * Teeth: 40T * Color: SILVER ANODIZED * Weight: 68g * Material: 6061 aluminum alloy * Chain size: 3/32" (this chainring will work with either a 3/32" or 1/8" chain - 3/32" is recommended for best performance and optimum weight savings) * Crank interface: 110 bcd / 130 bcd (Don't know what size Bolt Circle Diameter you need? Measure center-to-center of two adjacent bolt holes on your crank spider and then refer to this chart: http://www.sheldonbrown.com/cribsheet-bcd.html ) * MADE IN THE USA

Chop Saw I 40T BMX Single Speed Bicycle Chainring 110/130 bcd - SILVER ANODIZED