The Rat Race Urban Adventure Series (website) is back again in Manchester this weekend for another round of high octane adventure. The UK's top climbers including Rich Simpson, Neil Pearsons, Gaz Parry, Andy Earl, Shane Ohly, Ben Heason, Miles Gibson, Rab Carrington, Nic Sellars, James Pearsons, Nick Colton and others(full list) will competing against each other in the Bruntwood Aerial Assault (website), an urban climbing race across the Manchester skyline. At the same time the Manchester Climbing Centre (website) is hosting a world dyno competition. Everything starts at 12pm midday. Head on down to the Adventure Base, Piccadilly Gardens. In addition there will be a big screen showing all the action, mountain bike trial demo's in the bad boy pit, music, food, massage and if you are up to it Saturday night sees a Rookie Challenge from 6-9pm.