The tension ratio is defined as:
Tension Ratio = Tight Side Span Tension (lb) / Slack Side Span Tension (lb)
Based on different operating characteristics, belt drives types have different design tension ratios. Assuming 180° wrap on both pulleys, here are some typical design tension ratios:
- 4:1 for Micro-V® Belt Drives
- 5:1 for V-belt Drives
- 8:1 for Synchronous Belt Drives
Assuming other drive parameters to be equal, larger tension ratios result in lower belt pull values.