This 520 conversion sprocket is narrower than the stock sprocket. No modifications are required to install this sprocket. This 520 sprocket can shave 1 to 2 pounds of weight off the drive-train. This reduction of un-sprung weight will provide better acceleration, braking and suspension feel for your street bike. The Dirt Tricks rear sprocket has a tooth profile designed for better chain contact and longevity. The unique spoke design gives these sprockets superior strength and tmaximum weight savings. The Dirt Tricks steel sprocket weighs only slightly more than an aluminum sprocket, but will last 3:1 over other aluminum options!

All the Technical Stuff
You can view a picture of the von Mises yield criterion stress analysis below
The finite element stress test analysis for 9000 pounds of chain tension (100 link 1100cc chain max tensile strength) results in a maximum stress level of 170,000psi
Our material’s yield strength is 230,000psi. 
Meaning the chain would have to handle 30% more pressure per square inch prior to any deformity of the sprocket. 
The tensile strength of the sprocket is 255,000. The catastrophic failure point is this margin…