Old 11-03-19, 02:02 PM
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TerryDi2C
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Looks like there are two types - a Wireless Unit D-Fly and a Wireless Unit D-Fly 2 port junction. The Shimano site doesn't really explain the difference between the two as far as I can see. I've read about A ports and junctions and I don't really have a clear understanding of how it all fits together.

The functionality of the EW-WU111 and EW-WU101 is the same, they just look different. The EW-WU111 is place in-line (with a port on each end), between junction A and a shifter or between junction A and junction B for example.

The EW-WU101 has two ports on one side and is a bit bulkier. This unit is usually placed near the rear derailleur (seat stay).
Either way, you can put both wherever you like, but Shimano recommend you place the EW-WU111 near the front of the bike. Mine is in the handlebar, but whatever works works .

If I drop the D-Fly unit in the seat tube will it be able to connect with the stuff on the outside? I'm sure I'm missing some resource that clearly explains all this but I'm just not clear.

Possibly. Try and find out .

Have a look at page 62 of this document for EW-WU111 installation instructions: https://si.shimano.com/#/en/DM/R8050 and this document for the EW-WU101: https://si.shimano.com/pdfs/dm/DM-RBWU001-05-ENG.pdf

But yeah.. the MTB "System Information Displays" also feature wireless(bluetooth/ant) connectivity - the MT800 and SC-M9051 (not the SC-M9050).

Last edited by TerryDi2C; 11-03-19 at 02:08 PM. Reason: clarification
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