Oh ok.. The risks of buying not running.. At least it's a small part.. if you can get one.. An engineer could make you one and harden it for you.. Or you could buy high carbon (0.6%) steel rod and heat treat/harden it yourself.
I like Kenda Bear Claw , but i dont need the big aggressive paaddle tread, need it occasionally, but they dont ride very good and not great for everyday use. The Kendas i buy have more of a lower profile tread but still enough to bite into the ground.