Trackball Ball Replacement
Find Trackball Ball Size
First, find your trackball ball size at Trackball Reviews. For old trackball, check Trackball History ๐ฒ
Ball Diameter Tolerance
Ball size differ by 1 or 2 mm is not a problem. More may be a problem.
76.2 mm Ball


76.2 mm and 57.15 mm Ball

(57.15 mm = 2 1/4 inch) American-style Billiard Ball
This set is highly recommended. The fuzzy coloring provides better tracking. Also lighter then normal billiard.


Aramith Premier Replacement Pool Ball Buy at amazon

Aramith Super Pro-Cup Pool Cue Ball 2.25 inch, 6 Red Dots Buy at amazon
55 mm Ball

Perixx 55 mm Ball Buy at amazon
52.388 mm (2 1/16 inch), Snooker ball

50 mm Ball

40 mm Ball

โK9 crystalโ is a type of high-tech glass. Light weight, and good optical property (e.g. no bubbles inside).
Note: it may not track well. I have not tried.
38.1 mm (1.5 inch) miniature pool ball

- DAD 5IVE Mini Billiards Pool Ball Set Buy at amazon
34 mm Ball


- Perixx 34 mm ball Buy at amazon
- Elecom 34 mm ball Buy at amazon

Crystal/Quartz Ball
Few things to be aware:
- Heavy ball may wear down the ceramic bearings in the trackball socket.
- Clear glass or polished surface may not track well.
- The advertised size is often inaccurate. Check buyer comments.
- May not be perfectly round.

Kensington Orbit Trackball with Scroll Ring, with Quartz Ball
Kensington Orbit Trackball with Scroll Ring



Inche to Millimeter Conversion Table
- 12 mm = 0.472 inch
- 13 mm = 0.512 inch
- 14 mm = 0.551 inch
- 15 mm = 0.591 inch
- 16 mm = 0.63 inch
- 17 mm = 0.669 inch
- 18 mm = 0.709 inch
- 19 mm = 0.748 inch
- 20 mm = 0.787 inch
- 21 mm = 0.827 inch
- 22 mm = 0.866 inch
- 23 mm = 0.906 inch
- 24 mm = 0.945 inch
- 25 mm = 0.984 inch
- 26 mm = 1.024 inch
- 27 mm = 1.063 inch
- 28 mm = 1.102 inch
- 29 mm = 1.142 inch
- 30 mm = 1.181 inch
- 31 mm = 1.22 inch
- 32 mm = 1.26 inch
- 33 mm = 1.299 inch
- 34 mm = 1.339 inch
- 35 mm = 1.378 inch (1 3/8 = 1.375)
- 36 mm = 1.417 inch
- 37 mm = 1.457 inch
- 38 mm = 1.496 inch
- 39 mm = 1.535 inch
- 40 mm = 1.575 inch
- 41 mm = 1.614 inch (1 5/8 = 1.625)
- 42 mm = 1.654 inch
- 43 mm = 1.693 inch
- 44 mm = 1.732 inch
- 45 mm = 1.772 inch
- 46 mm = 1.811 inch
- 47 mm = 1.85 inch
- 48 mm = 1.89 inch
- 49 mm = 1.929 inch
- 50 mm = 1.969 inch
- 51 mm = 2.008 inch
- 52 mm = 2.047 inch (52.388 mm = 2 1/16 inch)
- 53 mm = 2.087 inch
- 54 mm = 2.126 inch (53.975 mm = 2 1/8 inch)
- 55 mm = 2.165 inch
- 56 mm = 2.205 inch
- 57 mm = 2.244 inch (57 mm = 2 1/4 inch)
- 58 mm = 2.283 inch
- 59 mm = 2.323 inch
trackball topic
- Best Trackballs, Xah Pick
- Trackballs Review ๐ฒ
- DIY Trackballs ๐ฒ
- Trackball History ๐ฒ
- Trackball Controller ๐ฒ
- Trackball vs Mouse
- How to Choose Trackball
- Trackball Static Friction (Stiction)
- Trackballs That Can Spin
- Ball Transfer Unit (BTU)
- Trackball Ball Replacement
- Trackball Size Comparison