Did you know that a drill bit just 0.01 inches off in diameter can reduce your Pinewood Derby car’s speed by several percent? Choosing the right size for your axle holes is more than a detail; it directly affects friction and wheel alignment.

Most racers settle on a 7/64-inch bit, but the ideal choice depends on precise axle measurements and wood density. Understanding these factors could be the key to shaving vital milliseconds off your time.