Ask a Mechanic | Short Chainstays and Cross Chaining With Di2 Ask a Mechanic | Short Chainstays and Cross Chaining With Di2 Daniel2015-12-16T15:25:28-08:00 Question: I have a Specialized Tarmac with Ultegra 6870 Di2 and I can’t get Ask a Mechanic | Short Chainstays and Cross Chaining With Di2Daniel2015-12-16T15:25:28-08:00