They are "the replacements" to the Terra Grappler, so I've been told. Anyway, I am not a fan of the lighting bolts on the side of the Terra Grappler. (Speaking of stupid) Plus the tread is very close to Terra. I think the key for Nitto is the better gas mileage they give. When your looking at $5 a gallon gas in the near future. Between the Terra and CrossTeK I think the CrossTek is the winner.