We took 2 trips from Da Lat, a short mountain bike ride (3-4hrs) in the pine forests near town and a ride and raft from Da Lat to Nha Trang.
The short ride was just as described and the 2 guides were attentive and helpful. Bikes were Giant mountain bikes in generally good and safe condition.
The longer ride, 50 kms on the 'new road' from Da Lat to Nha Trang is through a national park and then a long descent to the plain, lunch, and a 2 hr raft down the river. The river only has small rapids, which was as expected and we had a thoroughly enjoyable day with 2 different, but excellent guides who were safety conscious, friendly and seemed to be enjoying being out there.
We had made the mistake of visiting Da Lat on a major holiday weekend without firm plans for the return to Saigon. We found everything booked and transport full, and Nhat at Phat Tire took the initiative to get our itinerary sorted out.
We would certainly use Phat Tire again.