Because they work great.
I raced my Drake hard for two seasons and they never showed any signs of wear. Why mess with something that works.
Losi is great about including the best parts in their upper end kits and would have included a different setup if they weren't already the best available.
Even Drake himself runs the universal instead of the cvd's....he claims the cvd's increase forward traction but the Losi universals increase side bite and are better in the ruff.....he talks about it in the tech talk section of the trinity website under topic ...Ask the Drake.
Correct.. the CVD's give better forward bite.. i think the universals are better.. i had a Kinwald buggy, and a Francis truck.. that i took the CVD's out of that.. seemed the universals gave better torque