This is definitely an issue of either an inadequately speced hub or a batch of faulty hubs produced by Shimano and shipped to Trek for this particular bike. It is becoming quite common. Trek is ramping it up and I predict a hub recall soon. Mine was one of the firsts to develop the rear hub grinding noise and actually failed in the shop, after they thought it was the motor and replaced it. They were test riding it in the shop and the hub lost it, with an internal clutch that failed completely. They rebuilt the hub with all new clutch parts, springs, pawls and gear. That failed again within less than 200 miles. I am waiting for Onyx to get us a hub that will work on this bike but my Allant 9.9s has been parked, gathering dust for a month now.
Get back to your guy at the Trek shop that he needs to talk to Trek corporate on this as the issue is on the front burner with them now.
I suggest you share the following information with him to get him on the right track:
"OK, just got off the phone with Jason Schumacher at Trek...
1st thing HE brought up in the conversation was that he apologized for not getting back to me regarding the rear hub issue.
Bottom line he said they have initiated a FQA (Field Quality Alert) and are working with Shimano to address the problem of the hub.
Quite frankly, I'm not really sure about too much more other than maybe you guys have maybe more valuable information as described here that you have been made aware of from your tech guys at your LBS. Point being, maybe you might want to share some of that info with Jason to push the envelope so that Shimano either fesses up and does a mass recall and or Trek saves face by using an optional hub (like the Onyx).
Jason (customer service manager for Trek) contact info:
[email protected] "