Simple rule for travel, regardless of how you are traveling.
Keep only a small amount of cash in your wallet. Keep only the thing you are willing to lose in there too. Usually just cash you need for the day and 1 debit/CC. This should be really handy for you to get to and use
Keep passport, most of you money and other things you don't want to loose very close on you in such a way you never really leave it alone. This is probably not very accessible but should be able to get to when needed.
also, hide some spare cash/CC and photocopies off ALL documents on your bike some where that isn't easily assessable by others.
Just figure out what works best for you.