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I like the Co-Op Grip Spur but it look like it would be really loud and ware fast. Where as the Superlug is aggressive but with a titer tread for a more friendly ride.
Yeah, the Grip-Spur, IMO, is if you're upwards of 90% off-road.
How tall are the Q78s? 16x8 rims? And now for the dumbest question in the history of expo..... Drumroll please.... How stupidly loud are they on the highway? Swarm of angry bees? Rusty chainsaw with no muffler??
I am a firm believer of tall skinny tires and wouldn't run anything else for an off-road rig.
Here is mine with Super Swamper TSL Q78 X16. It is a great tire that quickly changes personalities with simple air pressure adjustments. I wish I could find an All-Terrain tire in this size as well. You would be surprised how well this big old heavy truck handles on the highway with these tires and how it well it works in the snow, mud, desert, and sand. Of my circle of friends that run the common 35x12.50's I am not the one that has issues getting around when the trail surface gets challenging.
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Another view while airing up before getting on the highway after leaving Toroweep
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Another advantage, on my body style truck anyway, is the fact the tall skinnies don't rub the fenders when the suspension is fully articulated plus you don't need a red neck style ten foot tall lift kit to run these tall skinnies.
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My 2005 Silverado 2500HD with Cooper Discoverer S/T 255/85R16's. Skinny, but not as tall as I would like for a full size rig.
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Do you think you could fit the Q78 x16 on your 2500HD? Is your HD suspension stock?