I've got a db30 with a slightly modded predator, and I was having the same problems with keeping the front wheel down. I ordered the adapter and a 54t just a couple days ago. I've got a 54t on another bike with similar mods and I like the rideability and the top speed. It lacks a little in low end torque, but it's better than being thrown off the bike on take off. Plus it should add 8mph to my top speed over the 70t.