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i've been racing weekly a medusa v2 60mm 2000kv for nearly a year and only had to replace the bearings in my tekno 8ight-e. Wicked awesome motor and a very nimble weight to boot. MMM v3 for the esc.... save the money iMO, those castle 2200's are 140ish, these medusa's are only 110 and w/ a mmm they are both deadly and rock solid.