Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Bricks is a question and answer site for LEGO® and building block enthusiasts. It only takes a minute to sign up.
Bag indicates that it was made in 2011.
This one is definitely from 10214 London Tower Bridge. I only have a used set that didn't have the original bags, but all parts and colors match perfectly.
The Technic Wedge Belt Wheel (Pulley) only comes in tan in 5 sets and the only one of those sets that has more than 2 (which your bag clearly does) is 10214 Tower Bridge.
Required, but never shown