since you ride do trails some i would go with a tire like the itp 589s. they do good in mud and are a ok trail tire. also the kenda executioners might also be a good tire. they are good in all round riding. for the width i would go skinny up front because the bigger you go in the front the harder the steering is. for the back it dosent really matter too much wider would let you have more bite and will help float in the water and skinny would not get you as muddy and dig you down in ruts to get traction.
best in mud is outlaws or mudzillas, for trail and mud... mud bugs, mud lites, or ITP 589's are good, also a really good mud tire that rides a little better than outlaws but is exceptional in mud is 27 inch bi-claw and tri-claw combinations.
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