Schacht's whorls are made to fit both the Matchless, Ladybug, and Sidekick wheels; however, because the drive wheel sizes are different on those three wheels, the ratios are different.

Schacht Matchless whorl ratios:

• Extra slow: 4:1 and 4.5:1
• Slow: 6:1 and 7.5:1
• Medium: 9:1 and 10.5:1 (standard with wheel)
• Fast: 12.6:1 and 15:1 (standard with wheel)
• High speed: 17:1 and 19:1 (requires high-speed bobbin if spinning double drive)
• Super high speed: 18:1 and 21:1 (requires high-speed bobbin if spinning double drive)

Schacht Ladybug whorl ratios:

• Extra slow: 3.2:1 and 3.6:1
• Slow: 4.7:1 and 5.5:1
• Medium: 6.5:1 and 8:1
• Fast: 9.:1 and 10.5:1
• High speed: 11.5:1 and 14:1 (requires high-speed bobbin if spinning double drive)
• Super high speed: 12:1 and 14.5:1 (requires high-speed bobbin if spinning double drive)

Schacht Sidekick whorl ratios:

• Extra slow: Not recommended
• Slow: 4:1 and 4.8:1
• Medium: 5.7:1 and 6.8:1
• Fast: 8:1 and 9:1
• High speed: 10:1 and 12:1
• Super high speed: 11:1 and 13:1