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Do you really need a contactor on your cycle?
A mechanical on/off battery switch is 100% efficient. A contactor isn't.
The other reason people use contactors in vehicles with PWM controllers is as a safety feature on the "throttle" - eg. you twist the grip and a microswitch signals the contactor to close, you release it, the contactor opens. In the event of a controller failure (they can & do fail fully "ON"), your first instinct will be to release the throttle, which breaks the connection, via the contactor, between the motor & battery pack (assuming it's rated to break the max theoretical current).
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