You can try this guide: Guide to Direct Drive Trainer Cassette Spacing
For any more specific advice, we’d need details about your specific setup - what bike brand, model, model year, the groupset, number of cogs etc.
You can try this guide: Guide to Direct Drive Trainer Cassette Spacing
For any more specific advice, we’d need details about your specific setup - what bike brand, model, model year, the groupset, number of cogs etc.