540 size sensorless brushless for cars The 5700Kv motor is our choice for the best all-around 10th scale buggy and truck motor. From fast on the track, to insane bashing speed runs, the 5700Kv delivers! On 6 cell NiMH or 2s Lipo packs, the 5700Kv motor has been clocked at 40mph in standard 10th scale buggies and trucks with standard gearing. With 3s lipo packs, you can expect 60mph for very large tracks or high speed runs. The 5700Kv motor is roughly equivalent in top speed to a very good 9t or 10t brushed motor on 6 cells