Premium #40 Roller Chain - 10ft Box | Premier Series Chain
AlveyTech #40/41/420 Chain 60 Tooth Rear Sprocket for 163-19cc Mini Bike, Replacement Steel - Walmart.com
RSC #40 1'-3-3/4" Roller Chain | eBay
3/8" Trident Marine ISO Grade 40, Hot Dipped Galvanized Windlass Chain (Sold Per Foot)
CountyLine 40 Chain Size 10 ft. Roller Chain at Tractor Supply Co.
Amazon.com: Jeremywell 40 Roller Chain 3 Feet with 1 Connecting Link for Go Karts, Mini Bikes, Scooters, ATV, MTV, Dirt Bike and Other Industrial Machinery : Automotive
Martin Roller Chain Sprocket, Bored-to-Size, Type B Hub, Single Strand, 40 Chain Size, 0.5" Pitch, 11 Teeth, 0.75" Bore Dia., 2.003" OD, 1.375" Hub Dia., 0.284" Width: Amazon.com: Industrial & Scientific
Chains of All Size and Flavors - GoPowerSports.com