There are a few reasons you might start shopping for a front brake rotor, and you may be surprised by how many options are out there. The front brake is possibly the second most important component on your motorcycle, second to the suspension. I mean, who cares how fast your engine is if you can't slow down for corners, right? For this application, we are reviewing an OEM replacement front rotor for a Yamaha YZ450F. It is understood that a larger-diameter rotor will offer more braking power, but the question is, can a stock-diameter aftermarket rotor outperform the OEM one?