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Sprocket - Front 520 16T
390-520-16T
520 Front Sprocket - 16T Made from Hard Chromoly Steel! NOT Case Hardened! These sprockets are LIGHT, and they are made to LAST! Machined here at Formula390, they are like a jewel! Machined for racing application, tho you can use them on the street as well. Machined with Titanium Carbide tooling (HSS and Cobalt just doesn't hold up against this SUPER hard material) they are craften here in house, one at a time, for the RC390 Racing Community. Every aspect of the design of these parts is with an eye towards the racer, not fabrication. What does that mean, it means that it takes a LONG time to make each sprocket. Over an hour! The transition to the teeth is rounded, instead of stepped, the tolerances are INCREDIBLY tight! The spline to match the countershaft is TIGHT! That means no excess wear on your countershaft, but again, time consuming. The threads for the retention clip are form tapped, not cut. This is the strongest thread you can make, but requires specialized tooling and can only be machined in a machining center. All of this combined means a sprocket which is light, strong, tight tolerances, and a lot of attention to the details! This is why the Formula390 Sprockets cost as much as they do, but race parts made by racers, for racers, is what we do!
Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 520 39T
TYSR-0114-39T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 40T
TYSR-0114-40T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 41T
TYSR-0114-41T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 42T
TYSR-0114-42T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 43T
TYSR-0114-43T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 44T
TYSR-0114-44T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 45T - Stock Size
TYSR-0114-45T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 46T
TYSR-0114-46T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 47T
TYSR-0114-47T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 48T
TYSR-0114-48T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $62.67 |
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Sprocket - Rear 520 56T
390-520-56T
Sprocket - Designed and machined in house from super strong 7075 T6 aluminium, and then anodized for superior corrosion and abrasion resistance. Gear Ratios Lookup | $85.00 |
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Sprocket - Front 415 19T
390-415-19T
415 Sprocket - 19T Made from Hard Chromoly Steel! NOT Case Hardened! These sprockets are LIGHT, and they are made to LAST! Machined here at Formula390, they are like a jewel! Machined for racing application (tho you can use them on the street as well) where acceleration is KEY! These sprockets allow the use of a 415 chain, which is 2# lighter than a 520 chain! Faster acceleration, and more power to the rear wheel. Machined with Titanium Carbide tooling (HSS and Cobalt just doesn't hold up against this SUPER hard material) they are craften here in house, one at a time, for the RC390 Racing Community. Every aspect of the design of these parts is with an eye towards the racer, not fabrication. What does that mean, it means that it takes a LONG time to make each sprocket. Over an hour! The transition to the teeth is rounded, instead of stepped, the tolerances are INCREDIBLY tight! The spline to match the countershaft is TIGHT! That means no excess wear on your countershaft, but again, time consuming. The threads for the retention clip are form tapped, not cut. This is the strongest thread you can make, but requires specialized tooling and can only be machined in a machining center. All of this combined means a sprocket which is light, strong, tight tolerances, and a lot of attention to the details! This is why the Formula390 Sprockets cost as much as they do, but race parts made by racers, for racers, is what we do!
Gear Ratios Lookup | $85.00 |
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Sprocket - Front 415 20T
390-415-20T
415 Sprocket - 20T Made from Hard Chromoly Steel! NOT Case Hardened! These sprockets are LIGHT, and they are made to LAST! Machined here at Formula390, they are like a jewel! Machined for racing application (tho you can use them on the street as well) where acceleration is KEY! These sprockets allow the use of a 415 chain, which is 2# lighter than a 520 chain! Faster acceleration, and more power to the rear wheel. Machined with Titanium Carbide tooling (HSS and Cobalt just doesn't hold up against this SUPER hard material) they are craften here in house, one at a time, for the RC390 Racing Community. Every aspect of the design of these parts is with an eye towards the racer, not fabrication. What does that mean, it means that it takes a LONG time to make each sprocket. Over an hour! The transition to the teeth is rounded, instead of stepped, the tolerances are INCREDIBLY tight! The spline to match the countershaft is TIGHT! That means no excess wear on your countershaft, but again, time consuming. The threads for the retention clip are form tapped, not cut. This is the strongest thread you can make, but requires specialized tooling and can only be machined in a machining center. All of this combined means a sprocket which is light, strong, tight tolerances, and a lot of attention to the details! This is why the Formula390 Sprockets cost as much as they do, but race parts made by racers, for racers, is what we do!
Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 49T
390-415-49T
415 Sprocket 49T - 0.388 Gear Ratio when paired with 19T front. Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 51T
390-415-51T
415 Sprocket 51T - 0.373 Gear Ratio when paired with 19T front. Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 53T
390-415-53T
415 Sprocket 53T - 0.358 Gear Ratio when paired with 19T front. Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 55T
390-415-55T
415 Sprocket 55T - 0.345 Gear Ratio when paired with 19T front. Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 57T
390-415-57T
415 Sprocket 57T - 0.333 Gear Ratio when paired with 19T front. The .333 gear ration matches the stock 15:45 stock gearing Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 59T
390-415-59T
415 Sprocket 59T - 0.322 Gear Ratio when paired with 19T front. Gear Ratios Lookup | $85.00 |
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Sprocket - Rear 415 61T
390-415-61T
415 Sprocket 61T - 0.311 Gear Ratio when paired with 19T front. Gear Ratios Lookup | $85.00 |
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