# S&S Cycle 99-06 BT 4-5/8in Stroke Flywheel Assembly W/O Sprocket Shaft Bearing

This 4-5/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in S&S® T143 engines for 1999-'06 HD® big twins. Sprocket shaft does not have a stock style bearing race pressed on. This flywheel assembly is for crankcases with Timken® sprocket shaft bearing. Pinion shaft has sprocket to drive balancer chain.

-   Assembly is trued to less than .0005" runout on pinion and sprocket shaft bearing surfaces, making them capable of higher rpm and fully compatible with gear drive cams
-   Flywheels are CNC machined from heat-treated, closed die, steel forgings, which are 114 percent stronger than late style stock steel flywheels
-   Fully assembled with premium quaility S&S® heavy duty 7.800" connecting rods, with full width wrist pin ends, and dynamically balanced
-   The only joints in the assembly are where the 1.671" diameter connecting rod crankpin is pressed into the flywheels
-   Pinion and sprocket shafts are forged as part of the flywheel
-   Flywheel assembly is three piece design

## Details

- **Price:** 2382.05 CAD
- **Vendor:** S&S Cycle
- **Type:** Flywheels

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2382.05 CAD | In stock |

## Images

- User 1

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-99-06-bt-4-5-8in-stroke-flywheel-assembly-w-o-sprocket-shaft-bearing-1)
> Updated: 2026-08-15