1. Finding a Replacement Ball Bearing J.D. Longboards Jon DeAmicis

3. Increase customer satisfaction

4. We don't make cheap beginners boards

5. We agree with our customers. We need Change!!!

7. CEO has has chosen Bones Reds and Abec 5 bearings.

9. And cool dogs!!

10. Rain is lame!

12. Keep bearings clean!!

13. It prevents scarring and cold welding

15. Cold welding happens when two peaks collide

17. Dropped a 453 gram weight attached to a rope (more like a string) wrapped around the wheel 4 times.

18. 12 trials for each brand, 3 per wheel.

20. Mean (average)

21. Median (middle number)

22. Mode (most common number)

25. Median – 31.9s

26. Mode – None

27. Standard Deviation – 7.7s

28. Pearson's Index - -1.4

30. Median – 40.5s

31. Mode – None

32. Standard Deviation – 21.3s

33. Pearson's index - -0.9

34. Comparison Bones Reds Abec 5 28.3s Mean 33.8s 31.9s Median 40.5s None Mode None 7.7s Standard Deviation 21.3s 75% Within One Standard Deviation 75% 100% Within Two Standard Deviations 100% -1.4 Pearson's index -0.9 v

36. Abec 5's had higher mean (33.8s) and higher median (40.5s)

37. Abec 5 has smaller skewness by Pearson's Index. (-.9)

38. Recomendation I recommend Abec 5 bearings for use in J.D. Longboards longboards.