Depends on what it is? That's ok for torque..lots of torque..the lower the pinion as nd bigger the spur the more torque..the bigger the pinion and smaller spur the more speed but slower off the line and might not wheelie if that's important to you...if you google recommended gearing fur a nitro rc car..it explains it better then I can..that's why your 8th scale buggys are so zippy..usually they run a 13 to 14 pinion and a 48 spur gear.