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We asked gear specialist Jim Cook to help us tear down and rebuild the Bulldog rear, and one of the first things he pointed out was the amount of thought that obviously went into the design. All quick change rearends look a lot alike at first, but it’s the details that make the difference. For example, Bulldog’s cast magnesium bell has multiple deep strengthening ribs both on the inside and out. Cook says the aluminum axle tubes may bend in a hard hit, but the bell should be able to handle quite a lick.