i have heard of guys doing this. it trims some weight off the rears. there is a guy on Nyroc's (fattireracer) that used to run the 27x9-12 and 27x12-12 Bighorns, but switched to the 27x9-12 size all around. he likes this better for going faster on the trails.
i would say this is an option that has merit with many people.
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