Wide tread tyres?

clockworked

Like an orange
So i've got 30mm ID rims and the width squares the tread and exposes the sidewalls. Got a slash right through the sidewall today, and totally forgot to pack a tube and pump, so it was the foot-falcon back to the carpark.

Anyone know of any 27.5 tyre options designed for less sidewall exposure on wide rims?
 
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