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Sprockets > Bicycle Chain Sprockets > 4-Hole Freewheel Sprockets

4-Hole Freewheel Sprockets for Bicycle Chain

  • 4-hole freewheel sprockets for #25 chain are used on most electric scooters, electric dirt bikes, electric mini bikes, electric pocket bikes, electric sport bikes, and electric go karts. The 4-hole freewheel sprockets on this page are for 1/2"x1/8" (#410) bicycle chain and may be used for modifying these types of vehicles to have a gear motor or bicycle pedal cranks.

  • 1/2" x 3/32" (#408) bicycle chain is used on multi-speed bicycles with front and/or rear derailleurs.

  • 1/2"x1/8" (#410) bicycle chain is used on single-speed and 3-speed bicycles with internal hub gears, and also used on electric bicycle gear motors which have a chain between the motor and a sprocket on the rear wheel.

  • 1/2" x 3/32" (#408) and 1/2"x1/8" (#410) bicycle chain are available on our Chain Page.

  • Motors with sprockets that are compatible with the 4-hole freewheel sprockets sold on this page are available on our Motors with 1/2" x 1/8" (#410) Chain Sprockets Page.

4-Hole Freewheel Sprockets and Freewheels
All of the freewheel sprockets, freewheels, hardware, and tools
on this page are 100% compatible and interchangeable with each other.
Freewheel
Sprockets		 Freewheel
Clutches		 Freewheel
Tools
Custom-Made Freewheel Sprockets with F4 Mounting Pattern

Important Information These are custom-made sprockets which are machined on an individual order basis so please allow for extra processing time when ordering. Custom-made sprocket orders cannot be cancelled after machining has begun on the sprocket and returns are not accepted on custom-made sprockets.

 

Any size 4-hole freewheel sprocket for 1/2"x1/8" (#410) chain between 23 and 90 teeth can be custom-made so if you need a size that is not listed below then please visit our custom-made sprockets page.

25 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
25 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 4.258" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41025F4		 $54.95


30 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
30 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 4.738" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41030F4		 $56.95


35 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
35 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 5.376" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41035F4		 $58.95


40 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
40 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 6.015" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41040F4		 $60.95


45 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
45 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 7.928" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41045F4		 $65.95


50 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
50 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 8.884" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41050F4		 $69.95


55 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
55 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 9.362" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41055F4		 $74.95


60 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
60 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 9.840" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41060F4		 $81.95


65 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
65 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 10.478" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41065F4		 $86.95


70 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
70 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 11.752" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41070F4		 $89.95


75 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
75 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 12.229" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41075F4		 $92.95


80 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
80 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 13.026" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41080F4		 $94.95


85 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
85 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 13.822" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41085F4		 $96.95


90 Tooth 4-Hole Freewheel Sprocket for 1/2" x 1/8" Bicycle Chain with F4 Mounting Pattern
90 tooth 4-hole freewheel sprocket for 1/2"x1/8" (#410) bicycle chain. F4 mounting pattern. 14.618" OD, 2.125" ID, 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Made of aircraft-grade tempered (hardened) aluminum alloy.
Item # SPR-41090F4		 $99.95
Freewheel Clutches

4-Hole Freewheel with M35 x 1.00 Right Hand Threads
F4 sprocket mounting pattern. 4-hole freewheel with M35x1.00 right hand threads. Four notches for installation and removal with a freewheel tool (sold below). Freewheel engages in the clockwise directions. Works with 4-hole 2.125" ID chain sprockets. 2.559" bolt circle diameter. Four 0.244" ID bolt holes. Adjacent mounting bolt holes are spaced 1.85" apart from center to center. M35x1.00 right hand threads are used for the freewheel on most electric scooters, electric dirt bikes, electric mini bikes, electric pocket bikes, electric sport bikes, and electric go karts.
Item # FWM-120		 $14.95


4-Hole Compatible 16 Tooth Freewheel with M35 x 1.00 Left Hand Threads
F4 sprocket mounting pattern. 4-hole compatible freewheel with M35x1.00 left hand threads. Freewheel has 16 teeth for 1/2"x1/8" (#410) chain and engages in the counterclockwise directions. Works with 4-hole 2.125" ID chain sprockets with 2.559" bolt circle diameter and four 0.244" ID bolt holes. M35x1.00 left hand threads are most commonly used for the rear brake on electric scooters, electric dirt bikes, electric mini bikes, electric pocket bikes, electric sport bikes, and electric go karts so this freewheel may be useful for modifications involving installing a chain on the left hand side of the vehicle.
Item # FWM-160

How does a sprocket attach to this freewheel?

 $12.95


4-Hole Sprocket to Freewheel Nut and Bolt Set
Stainless steel bolt and locknut hardware set used for attaching 4-hole sprockets to 4-hole freewheels. Set includes four bolts and four locknuts.
Item # HDW-100		 $2.95


Freewheel and Brake to Threaded Wheel Hub Spacer with 35mm ID
Freewheel and brake to threaded wheel hub spacer. Works with both M35x1.00 and 1.375" x 24 TPI freewheels. 35mm ID, 42mm OD, 2.5mm thick. Made from yellow zinc plated steel.
Item # HDW-3525
Installation Example

$1.95
Freewheel Tools

Four Notch Freewheel Removal Tool
 Freewheel removal tool for both 4-notch and 8-notch freewheels. Works with freewheel clutch item # FWM-120 sold above. Professional quality tool made from nickel plated forged steel. Can be used to install freewheels however freewheels can also be installed by hand and then tightened by the motor the first time that the vehicle is used.
Item # FWM-400		 $9.95

Related Items: Bicycle Chain



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