How strong are your Flywheels?

In Product News, Rollies Speed Shop Updates by Rollies Speed Shop

You’ve Got to Be Strong…

As the performance of an engine is increased, eventually a weak link is found and something fails. One such weak link is the stock flywheel assembly in 1999-to present Harley-Davidson® big twins.

S&S has produced all new flywheel assemblies, with integral sprocket and pinion shafts plus all new connecting rod and crankpin. Using superior materials for added strength, these crankshafts are a vast improvement over stock, and a must for stock rebuilds or performance Twin Cam.


Available for all 1999-2013 Harley-Davidson® big twins – Balanced and unbalanced models

Features & Benefits

  • Heat-treated 4140 material is harder and 114% stronger than stock
  • Harder material, eliminates thrust washer
  • Larger 1.671” diameter crankpin
  • Designed with increased cross-sectional area for increased crank-pin clamping force – No welding required!
  • Integral mainshafts – Eliminates two potential points of weakness
  • Consistent balance and precision machining – Truer flywheels and less vibration
  • Reduced mainshaft deflection at high rpm – less vibration, reduced piston and rod side thrusting, prevents oil pump damage, fully compatible with gear drive cams
  • Capable of higher rpm – More available power!
  • Trued to with in .0005” TIR
  • Rod Bearings have 20 rollers vs 18 stock