The new tune option comes from feedback from their Enduro eMTB racing team, and a few of the features are also available for the EP600 series motors, too. Designed to help their racers shave seconds and have more control over the motor's performance, these updates focus on maximizing output and operational speed.
Basically, this means the 600W motor more quickly and easily achieves the maximum 400% assist when it's in the highest boost setting. If you're on a really steep climb or hit a steep pitch unexpectedly, this helps you out more and more quickly.
The progressive cutoff feature lets you customize how sharply the assistance tapers off when you get near the maximum assist speed. You can have it gradually taper off for a more natural feel, or drop off a cliff as soon as you reach the top speed so you can eke out every last ounce of assistance.
Lastly, you can set the extended assist to keep the motor going for Short, Medium, or Long durations when you stop pedaling. This helps if you have to stop pedaling through a really rough, technical section so you don't clip your pedals but also don't want to lose momentum. Backpedaling cancels it, giving you a quick, easy way to cancel it in a pinch.
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