I used a fluke laser Infrared thermometer on my motor to see how hot it gets at 42v at full throttle for 30 minutes in 90 degree weather. I pointed the laser all over it and found that the front of the motor is much hotter than any place else. The back was 109 degrees, the outer ribbed circle was also 109, but the front of the motor was 147 degrees.

I also opened up the box holding the controller and checked the temp in there and everything was 97 degrees the controller was 107 degrees. Nothing out of the ordinary.

Checked the batteries as well the lifepo4 cells were 97 degrees so no issue there.

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1st bike - Ezip trailz mountain bike with 36v Shockley LifePO4 - Avg. 27MPH
2nd bike - Beach cruiser, 36v Shockley LifePO4, rear Puma hub motor kit - Avg 22MPH --- Coming soon - 48v Shockley LifePO4 to increast top speed to 29MPH!

Test coming soon two 36v Shockley LifePO4 battery packs in series for 72v. Top speed should be around 44MPH