Hold the bike until the payment clears. That is Paypal policy & good business on your part. This is just like an uncleared check deposited inn your bank account. Paypal sometimes does this with buyers who don't have a registered credit card; they treat it like a check and don't release the money until it clears the buyer's bank. Chances are that it will workout. Be patient and keep the bike until the payment clears. Track the package and, if you're really nervous, insure it. No harm in asking for a signature upon delivery.
Paul Patzkowsky
Longmont, Colorado