Engine chain sprocket sprocket
We’ve several rear sprocket possibilities for our clients to “fine tune” their gas operated bicycle to accomplish their desired optimal acceleration/power gear ratio.
A note to keep in mind: The larger the rear sprocket, the slower the bike will move, but will have power to climb hills. Small the rear sprocket, the faster the bike will move, but will climb hills much less successfully. You are trading power for rate or vice versa.
We offer sizes of 36 tooth, 44 tooth, 48 tooth, and 56 tooth sprockets in the Large 9-hole gear. The inner diameter is usually 1.4″, hole spacing is usually 1″. See table below for specs. Commonly, the large 9-hole sprocket with 48 tooth configuration will come with the 4G T-Belt Drive 4-stroke engine kit.

Rear Sprocket (Large 9 Hole) Hole Spacing Internal Diameter Outer Diameter Top Speed Acceleration/Power Included With
36 Tooth 1″ 1 13/32″ 5 7/8″ Fast Low Sold Separately
44 Tooth 1″ 1 13/32″ 7″ Moderate+ Moderate- Sold Separately
48 Tooth 1″ 1 13/32″ 8 1/8″ Moderate- Moderate+ 4G T-Belt
56 Tooth 1″ 1 13/32″ 9″ Gradual High Sold Separately

The small 9-hole sprockets come in two sizes, 44 tooth and 50 tooth. The inner diameter is 1.39″ and hole spacing is 1″. See desk below for specifications. The tiny 9-hole 44 tooth sprocket will come with the SkyHawk Angle Fire 2-stroke engine kit.

Rear Sprocket (Small 9 Hole) Hole Spacing Inner Diameter Outer Diameter Best Speed Acceleration/Power Included With
44 Tooth 1″ 1.39″ 7 1/8″ Moderate+ Moderate- SkyHawk Angle Fire
50 Tooth 1″ 1.39″ 8 1/8″ Sluggish High Sold Separately

We also carry 5-hole sprockets in 44 tooth, and 48 tooth sizes. The inner diameter is definitely 2.5″ and the hole spacing can be 2″. Outer diameters are 7″ for the 44 tooth and 8″ for the 48 tooth

Rear Sprocket (5 Hole) Hole Spacing Inner Diameter Outer Diameter Top Speed Acceleration/Power Included With
44 Tooth 2″ 2.5″ 7″ Moderate+ Moderate- SkyHawk Angle Fire
48 Tooth 2″ 2.5″ 8″ Moderate- Moderate+ Sold Separately

We provide a 6-hole sprocket in 36 tooth, 44 tooth, and 50 tooth sprocket sizes. Inner diameter 1.8″ and hole spacing of just one 1.5″. Outer diameters are 5 7/8″ for the 36 tooth, 7.25″ for the 44 tooth, and 8 1/8″ for the 50 tooth

Rear Sprocket (6 Hole) Hole Spacing Inner Diameter Outer Diameter Best Speed Acceleration/Power Included With
36 Tooth 1.5″ 1.8″ 5 7/8″ Fast Slow Sold Separately
44 Tooth 1.5″ 1.8″ 7 1/4″ Moderate+ Moderate- Sold Separately
50 Tooth 1.5″ 1.8″ 8 1/8″ Sluggish High Sold Separately

We offer a disc brake sprocket that bolts to the brake rotor hub in a 44 tooth sprocket. Inner diameter is definitely 1.29″ and hole spacing is 1″ with an outer diameter of 7″

Disc Brake Sprocket (9 Hole) Hole Spacing Inner Diameter Outer Diameter Top Speed Acceleration/Power Included With
44 Tooth 1″ 1.29″ 7″ Moderate+ Moderate- Sold Separately
Ever-power Engine Sprocket Shaft
Description
Description for Ever-power Engine Sprocket Shaft
• Pins and shafts are machined from super-tough, aircraft-rated Durabar 60 metal and bearing surfaces are surface to a 16 micron finish
• Deep heat-treating provides 60-63 Rockwell hardness and CNC machined tapers assure concentricity within .0003″
• 3-hole crank pin design distributes oil similarly to both rod races
• Annealed threads on shafts allow torquing up to 100 ft. pounds. over the OEM specifications
ENGINE SPROCKET, 13T
This sprocket was originally designed for the Yerf Dog Spiderbox GX150. It will fit most GY6 engines without reverse.
In case you are choosing to eliminate a reverse box instead of replacing it, you can use this sprocket to do away with the complete setup cleanly.