The BM-DN100 external battery mount lets you use the older generation SM-BTR1 on your bike and take advantage of Synchronized Shifting - this battery mount contains updated hardware that enables Synchro-shift. If you cannot fit the BT-DN110 internal battery in your frame, this external mount and SM-BTR1 is what you'd use.
It is available in three versions, so you will probably be able to find one that suits your bike. The BM-DN100-S is the short version, supporting internal/external wiring. The BM-DN100-L is the long mount while BM-DN100-I is a long mount meant for internal cable routing. Have a look at the BM-DN100 different sizes pdf for more information.
All three versions are fastened using M4 x 10mm (or 16mm) screws.
Details & specifications
| Shimano model code | BM-DN100-S, BM-DN100-L, BM-DN-100-I |
| Shimano model name | External battery mount |
| Weight | 50 g |
| Series | Ultegra 6770, Ultegra 6780, Ultegra R8000, DURA-ACE 9070, DURA-ACE R9150, GRX, MTB |
| Downloads |
BM-DN100 manual BM-DN100 Different sizes |
| View on | eBay (new tab) |
Shopping links
Are you looking to upgrade your bike using this component? We've added shoppings links to this component's Amazon and eBay pages. Click the images below to view the Amazon product page or eBay search results.
Additional images
BM-DN100-S (short)
BM-DN100-I (long, internal)
BM-DN100-I (long)