I was riding back from the Parliament Smidsy gathering this afternoon along the Monash around 1:20pm. I was in the left lane travelling at a relaxed 100k approaching the Warrigal Rd exit lane. In front of me was a concreters tray truck, cars behind and a bus to my right. All's cruisy until a 4x2 wooden plank falls off the truck into my path. I was only two car lengths behind, so had maybe a second to decide what to do. I recall actually thinking 'countersteer-no- don't want to risk hitting it skewif when leaning' so I relaxed the wrists a bit and stood up on the pegs as I hit it. It was a big jolt, but I stayed upright and not squashed under a bus (yep, happy about that). Pulled over, sucked in a few breaths and checked out the bike- looked OK. I got back on and continued my commute. When I got home I had a closer look at the bike and the only damage was that my front rim had suffered a knock and was now out of round. Price of a new wheel $1,560. Might see of it can be rolled out to round again. Could have been worse!!