Sorry what I ment is what scale. A Spy will only work with Mini scale. If you want a cheep but good ESC I go with Tazer
http://www.teamnovak.com/products/esc/spy/index.html This is a link for info on novak SPY
http://h1071671.hobbyshopnow.com/pro...p?prod=DYN4925 This is a link to check out Tazer ESC
If it don't help let me know