The Golden Wrench

A blog about bicycle repair and maintenance by the mechanics at Freewheel Bike.

Saturday, January 30, 2010

We are a Shimano Di2 test ride center!

We are upgrading this 56cm Madone to Shimano Di2 components for people to come test ride.

Most bikes require that one of these little metal tabs are adhered the the seat tube to protect the frame from the front derailleur's support bolt.

Trek did a nice job designing the front derailleur braze-on so that the little metal tabs are not required.

Here's the bike with all of the new Di2 components installed. We are just waiting for the internal wire kit to finish it up. you can learn more about Shimano's Di2 group here and here.

You can win this Di2 hat by being the first person to e-mail all of the correct answers to the following trivia questions to

1. What is the largest sprocket that that you can use with the Di2 RD-7970 rear derailleur?
2. Why do you have to be careful when lubricating the Di2 derailleur pivots?

1/31/10 7:09pm We have a winner. The answer to question #1 is; 27 teeth. The answer to question #2 is; if you lubricate pivots that are connected to the motor, the seals might become damaged and expose the motor to contamination. Thanks for playing.