Electronic & Hydraulic Shifting (Di2, Ui2, customisations)

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grams in reply to @onyerbike

Shimano’s compatibly chart says you can only use EW67A with an external battery, and explicitly rules out your combination:

“SM-EW67-A-E (Junction [A]) is not compatible with SM-BCR2 and SM-BTR2.”

https://productinfo.shimano.com/#/com?cid=C-472&acid=C-473

It still might work in practice, but you’re paddling uphill.

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Brommers in reply to @grams

Good point. I was thinking I'd got a Di2 system with an EW67 junction box working with an internal battery, but thinking back that was an external battery that I'd hacked to turn into an internal battery.

It appears from this that the EW67 used to work with a BTR2, but Shimano broke it when they stopped 10/11 speed mismatched systems. Presumably on the basis that with an EW67 and an internal battery you've no way of charging the battery without disassembling everything.

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onyerbike in reply to @Brommers

Yes I suppose this makes sense, but I had a workaround for charging already lined up so had hoped it would just work.

This is annoying, it's a TT bike where it would be nice to hide the battery. I could switch to a Junction A at a stretch, hidden in the bento box.

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