I've seen it work fine in either direction. Pulling the rear ones to the front may buy you some time until you notice the front one has come loose or broken. Another point: if you pull the back ones too tight in the opposite direction, you'll actually be pulling the bike out of the chock. I've seen that happen, too. Personally, if I were using a 4 strap method, I'd pull all 4 forward. I use a 2 strap method, however. One on each side of the bike, low and towards the middle of the bike. (on the 929 I use the forward most part of the subframe). Then both get pulled forward about 45 degrees. Wheel must be in a chock. Rock solid, and doesn't tweek down on the forks, as it compresses both front and rear. I check the straps every time to make sure they are in perfect shape. Got the tip from someone who knew someone who transported $30k race bikes and that was the method they used. Works awesome, but isn't possible on some bikes.