I run 30" Crawlers on beadlocks with a stock clutch. My riding is a lot of slower speed technical trails (rocks, ruts, roots, hill climbs) such as Kentucky and Tennessee (Windrock, Brimstone, etc...). I've ran the stock 26" Bighorns for awhile, then 28" Intimidators (heavy), and now 30" Crawlers. While I think a clutch kit would be nice it's not required by any means based on my opinion. The only time I couldn't easily spin the tires was trying to back up a steep slope that had about 4" of thick peanut butter consistency clay mud on it.