30 inch silverback are not a tough tire

got about 150 km on my silverback 30 inch-11 inch and 9 inches in front. They are bulging everywhere, I’m running 9 pounds in them, they told me to run 12 pounds because they crack so I ran 12 pounds and they started bulging, now I’m running 9 in them 1 front lug cracked and still bulging, never did any high speed with them

be warned