On many forums everyone says that this hanger made by Wheels Manufacturing is the best for quality of aluminium they used. I totally agree, the original Cervelo one is rubbish compared to this. Buy it, you will be happy.

I purchased this item as my rear derailleur hanger broke following a wee spill. Having researched the item on the internet I found that Sigma were the only stockest. The purchase was made over the Internet/ phone call to the store. The item was delivered within a few days, however upon coming to fit it to my Cervelo S3 I found that the two grub screws supplied were the wrong size! too large, due to the damage to the old hanger the old screws had come out. I now have a rear hanger that I cannot fit and I've been unable to source such small fitting screws!!!!