Short answer: There is no strict rule in Jain dharma that forbids buying a new bike during Daslakshan Parva, but many Jains prefer to limit non-essential spending and focus on spiritual practices during this period.

Why: Daslakshan Parva is a time of heightened reflection, vows, and self-control. It’s common to reduce indulgence and unnecessary materialism to keep the mind steady for spiritual focus. If a purchase is truly essential (e.g., it’s needed for safety or daily duties) it’s often approached with careful intention and minimalism.

Practical suggestions:

• If your current bike is usable, consider postponing a new purchase until after the Parva.
• If you must buy something, choose a simple, practical option and avoid extravagance.
• Align the decision with ahimsa and aparigraha (non-attachment). Reflect on whether the purchase will truly contribute to your well-being or merely satisfy comfort.
• If in doubt, seek guidance from your local Jain community or guru, who can give advice suited to your vows and tradition (Digambar or Shwetambar).

Note: Both Digambar and Shwetambar traditions emphasize restraint and spiritual focus during Daslakshan Parva, though there can be slight differences in emphasis.