SDRC Raceway in San Diego, California,
is a modern indoor electric off-road
track, with cutting-edge amenities
that include a misting system to improve
traction and consistency.
Each buggy was tested on Pro-Line
Positron tires in clay compound with
molded inserts (included with tires)
on dish wheels. Unsurprisingly, both
buggies turned faster laps on the
After outdoor action photos were completed, we took all the buggies over
to SDRC Raceway in San Diego, California, for real-world indoor high-bite
clay track testing. SDRC is a highly respected track with the newest modern
technologies and terrain features, including a misting system
to help the track maintain consistency and a high level of
overall grip. The goal of our track testing was to determine
how the cars performed as competition vehicles, as
opposed to measuring their fun-running abilities.
Tuning was limited to camber, ride height, and front
toe-in as these are the settings new racers are most
likely to use and do not require not-included parts.
We first tested with each car’s mounted stock rubber,
then swapped out for phase two of testing with Pro-Line’s newest elite-level Positron racing tires in MC (clay)
The Kyosho’s stock tires are molded in a rubber compound that seems
aimed at long life and provided less overall traction than the B4’s stock
rubber. Neither buggy’s tires are going to perform as well as track-specific
rubber, but the B4’s softer tires are likely to get you closer to race pace than the
Kyosho’s factory treads. That’s not to say they’re bad; they just offer less ultimate
grip than the Associated tires.
Next, it was time to swap out to the Pro-Line Positrons with molded inserts to see what the buggies could do on
identical tires. The Positrons greatly improved traction, and the extra grip gave us more confidence to push harder and
tighten up our lines. As expected, the Kyosho improved the most dramatically since it had the least traction of the two
cars on its stock tires. The RB6 was still about a tenth slower than the B4 but proved the most consistent from lap to
lap. Though faster in terms of individual lap times, the B4 wasn’t as easy to drive, and laps with bobbles brought down
the B4’s average lap times below the RB6’s.