A&C Black Books are offering the opportunity to win some of our great Sports book – Ultimate Triathlon and The Mountain Bike Skills Manual – in their 12 Days of Christmas giveaway.

To be in with a chance to nab this great set, send a Tweet to @ACBlackbooks answering this question: Who won the 2011 Tour de France?

But get in quick as answers need to be in by 2pm today. Good luck and happy tweeting.