Hi Tina,
I also not to heard about bike race for foreigners in ho chi minh city.
I am a member ò vechaisaigon group,
I am to great to introduce to you and welcoming you a place for bike ì you like adventure and tropical jungle experience
I don't know how to way post photos on thi xedap.org
You can see more at this link
https://plus.google.com/u/0/photos/1...17607079008225
Goodluck