Engine Sprocket

Engine Sprocket
We’ve several rear sprocket options available for our clients to “good tune” their gas operated bicycle to achieve their desired optimal rate/power gear ratio.
A note to remember: The larger the rear sprocket, the slower the bike will move, but will have power to climb hills. Small the rear sprocket, the quicker the bike will go, but will climb hills much less effectively. You are trading power for quickness 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″. Observe table below for specs. Commonly, the large 9-hole sprocket with 48 tooth configuration should come with the 4G T-Belt Drive 4-stroke engine kit.

Rear Sprocket (Large 9 Hole) Hole Spacing Inner 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″ Sluggish High Sold Separately

The small 9-hole sprockets can be found in two sizes, 44 tooth and 50 tooth. The internal diameter is definitely 1.39″ and hole spacing is 1″. See table below for specifications. The small 9-hole 44 tooth sprocket should come with the SkyHawk Position Fire 2-stroke engine kit.

Rear Sprocket (Small 9 Hole) Hole Spacing Internal Diameter Outer Diameter Top 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″ Slow High Sold Separately

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

Back Sprocket (5 Hole) Hole Spacing Inner Diameter External 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 offer a 6-hole sprocket in 36 tooth, 44 tooth, and 50 tooth sprocket sizes. Internal 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 Top 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″ Gradual High Sold Separately

We offer a disc brake sprocket that bolts to the brake rotor hub in a 44 tooth sprocket. Internal diameter is definitely 1.29″ and hole spacing is 1″ with an external 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 Engine Sprocket china super-challenging, aircraft-rated Durabar 60 steel and bearing surfaces are surface to a 16 micron finish
• Deep heat-treating provides 60-63 Rockwell hardness and CNC machined tapers guarantee concentricity within .0003″
• 3-hole crank pin design distributes oil equally to both rod races
• Annealed threads on shafts allow torquing up to 100 ft. lbs. over the OEM specifications
ENGINE SPROCKET, 13T
This sprocket was originally made for the Yerf Dog Spiderbox GX150. It’ll fit many GY6 engines without reverse.
In case you are choosing to eliminate a reverse box instead of replacing it, you may use this sprocket to do away with the complete setup cleanly.

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Post Digger Co., Ltd.

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Mail: sales@postdigger.xyz

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