3. Make Sure You Press and Hold the Spin Wheel to Increase Your Chances of Getting Lucky and Winning
GottaBeMobile.com noted that this method will increase your chances of winning on the spin wheel:
• When you complete a race you will eventually be able to spin for a reward. You can earn parts, gems and upgrades doing this. Most of the time it is luck of the spin, but you can hold on an object to make the winning area bigger.
• This may not unlock until a character tells you that it is possible, but once she does use this to get the parts you need.