The gear ratios are 11/14 for the clutch bell and 44/47 for the spurs. These gears work well for the tall Ofna Pirate P10 tires. I would rather use the single speed set-up knowing how the 2spd shift pin break so easily. You are right about the wheelies and the battery box. I may have to reinstall the all-in-one P10 battery/receiver box. If things start breaking, I plan on going back to the .15 rear exhaust big block or OS 18 CVRX set-up for cvas/axle longevity.