Originally Posted by
hythamfekry
Thanks for the reply .
i'm buying the SM-BCR2 as syncro may not work if all component aren't updated to same recent FW i assume also i need it for customization "shift speed , etc .. "
i can buy an external charger SM-BCR1 "Only if BCR2 don't work for charging" , SM-BTC1 is almost same value
So Question is , SM-BTC1 is intended for Mountain DI2 , and it have 6 ports as i understand and can be used instead of junction B , but is is compatible with rest of the group ,,, can't find that in compatibility matrix , not sure if someone have done that before
I didn't even realize that the SM-BTC1 had a B junction in it. I thought it was basically just a plastic tube to hold the battery, but if it also replaces that horrible under-BB junction box (SM-JC40), then it's starting to look like a pretty good value (it looks like it might even include an e-tube wire for the battery, so that's another $20 savings). Anyway I'd be amazed if it didn't work with road groups, as I think the B junction just passively wires all the ports together and doesn't care what kind of packets are being sent over the CAN bus. The other junction B's (SM-JC40, JC41) are used for both mountain and road, so this should work with both also.
P.S. According to this, the SM-BTC1 is compatible with road and mountain groups. It doesn't specifically list the Ultegra 8000 generation, but from an e-tube point of view, there's no difference.
https://www.bike-discount.de/en/buy/...sm-btc1-220699