49 Greatest 420 Chain Sizes

 

Sunstar 10315 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10315 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10315 15-Teeth 420 Chain Size Front Countershaft Sprocket - Manufactured from case-hardened chromoly steel. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. The same great quality that the oem’s have trusted since 1946.

 

Sunstar 2-111735 35-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111735 35-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111735 35-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance.

 

Sunstar 11114 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 11114 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 11114 14-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. Manufactured from case-hardened chromoly steel.

 

Sunstar 2-145650 50-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-145650 50-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-145650 50-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 2-102244 44-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102244 44-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102244 44-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance.

 

Sunstar 2-102235 35-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102235 35-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102235 35-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 2-100628 28-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-100628 28-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-100628 28-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 2-130849 49-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130849 49-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130849 49-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 10413 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10413 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10413 13-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel. ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 5-145651 Works Triplestar 51-Teeth 420 Chain Size Rear Aluminum Sprocket

Sunstar 5-145651 Works Triplestar 51-Teeth 420 Chain Size Rear Aluminum Sprocket

Sunstar 5-145651 Works Triplestar 51-Teeth 420 Chain Size Rear Aluminum Sprocket - Exclusive tooth-valley design for more chain contact area, resulting in smoothest power transfer possible and longer sprocket life. Computer designed weight reduction holes for stability and lightness. 7075 t6 hardened aluminum construction. Extra thick, hard anodized coating for 15-20 percentage increase in durability.

 

Sunstar 10215 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10215 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10215 15-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 10314 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10314 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10314 14-Teeth 420 Chain Size Front Countershaft Sprocket - ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel.

 

Sunstar 2-145656 56-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-145656 56-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-145656 56-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 2-111732 32-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111732 32-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111732 32-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 10313 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10313 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10313 13-Teeth 420 Chain Size Front Countershaft Sprocket - ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. Manufactured from case-hardened chromoly steel. The same great quality that the oem’s have trusted since 1946.

 

Sunstar 2-106037 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-106037 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-106037 37-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 2-100837 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-100837 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-100837 37-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance.

 

Sunstar 2-142348 48-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142348 48-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142348 48-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance.

 

Sunstar 11115 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 11115 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 11115 15-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 10415 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10415 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10415 15-Teeth 420 Chain Size Front Countershaft Sprocket - ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel.

 

Sunstar 10715 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10715 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10715 15-Teeth 420 Chain Size Front Countershaft Sprocket - Manufactured from case-hardened chromoly steel. The same great quality that the oem’s have trusted since 1946. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 10714 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10714 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10714 14-Teeth 420 Chain Size Front Countershaft Sprocket - ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel.

 

Sunstar 10914 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10914 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10914 14-Teeth 420 Chain Size Front Countershaft Sprocket - ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. Manufactured from case-hardened chromoly steel. The same great quality that the oem’s have trusted since 1946.

 

Sunstar 2-111737 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111737 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111737 37-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 2-142350 50-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142350 50-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142350 50-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 10412 12-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10412 12-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10412 12-Teeth 420 Chain Size Front Countershaft Sprocket - Manufactured from case-hardened chromoly steel. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. The same great quality that the oem’s have trusted since 1946.

 

Sunstar 2-142351 51-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142351 51-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142351 51-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 2-111745 45-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111745 45-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-111745 45-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 10915 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10915 15-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10915 15-Teeth 420 Chain Size Front Countershaft Sprocket - ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. Manufactured from case-hardened chromoly steel. The same great quality that the oem’s have trusted since 1946.

 

Sunstar 10612 12-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10612 12-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10612 12-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel. ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 2-102246 46-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102246 46-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102246 46-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 2-103738 38-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-103738 38-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-103738 38-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 2-102236 36-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102236 36-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102236 36-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 2-145649 49-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-145649 49-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-145649 49-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance.

 

Sunstar 2-100337 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-100337 37-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-100337 37-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 10113 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10113 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10113 13-Teeth 420 Chain Size Front Countershaft Sprocket - Manufactured from case-hardened chromoly steel. The same great quality that the oem’s have trusted since 1946. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 10414 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10414 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10414 14-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. ‘Parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. Manufactured from case-hardened chromoly steel.

 

Sunstar 2-103732 32-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-103732 32-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-103732 32-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 10913 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10913 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10913 13-Teeth 420 Chain Size Front Countershaft Sprocket - The same great quality that the oem’s have trusted since 1946. Manufactured from case-hardened chromoly steel. ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 2-130846 46-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130846 46-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130846 46-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 2-142353 53-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142353 53-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-142353 53-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance.

 

Sunstar 5-142352 Works Triplestar 52-Teeth 420 Chain Size Rear Aluminum Sprocket

Sunstar 5-142352 Works Triplestar 52-Teeth 420 Chain Size Rear Aluminum Sprocket

Sunstar 5-142352 Works Triplestar 52-Teeth 420 Chain Size Rear Aluminum Sprocket - Extra thick, hard anodized coating for 15-20 percentage increase in durability. Exclusive tooth-valley design for more chain contact area, resulting in smoothest power transfer possible and longer sprocket life. 7075 t6 hardened aluminum construction. Computer designed weight reduction holes for stability and lightness.

 

Sunstar 2-102238 38-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102238 38-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-102238 38-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 2-103735 35-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-103735 35-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-103735 35-Teeth 420 Chain Size Rear Steel Sprocket - The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance.

 

Sunstar 10214 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10214 14-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10214 14-Teeth 420 Chain Size Front Countershaft Sprocket - Manufactured from case-hardened chromoly steel. The same great quality that the oem’s have trusted since 1946. ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life.

 

Sunstar 2-130845 45-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130845 45-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130845 45-Teeth 420 Chain Size Rear Steel Sprocket - The zinc plating and baked on paint process helps achieve a great, long lasting appearance. Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.

 

Sunstar 10213 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10213 13-Teeth 420 Chain Size Front Countershaft Sprocket

Sunstar 10213 13-Teeth 420 Chain Size Front Countershaft Sprocket - Manufactured from case-hardened chromoly steel. ‘parkerized’ surface treatment provides rust and corrosion resistance, leading to longer overall sprocket life. The same great quality that the oem’s have trusted since 1946.

 

Sunstar 5-145656 Works Triplestar 56-Teeth 420 Chain Size Rear Aluminum Sprocket

Sunstar 5-145656 Works Triplestar 56-Teeth 420 Chain Size Rear Aluminum Sprocket

Sunstar 5-145656 Works Triplestar 56-Teeth 420 Chain Size Rear Aluminum Sprocket - 7075 t6 hardened aluminum construction. Extra thick, hard anodized coating for 15-20 percentage increase in durability. Exclusive tooth-valley design for more chain contact area, resulting in smoothest power transfer possible and longer sprocket life. Computer designed weight reduction holes for stability and lightness.

 

Sunstar 2-130836 36-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130836 36-Teeth 420 Chain Size Rear Steel Sprocket

Sunstar 2-130836 36-Teeth 420 Chain Size Rear Steel Sprocket - Constructed of 1045 series high carbon steel with an exclusive heat treatment process for added strength and wear resistance. The zinc plating and baked on paint process helps achieve a great, long lasting appearance. The strongest and longest lasting standard steel rear sprocket available, also trusted by japanese oem’s since 1946.