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Kev, not tested it - but I can't imagine a Nexus 7 with coaster brake would play very nicely. In addition to this, my freind's bike that i fitted Bafang mid to has destroyed two Nexus 7's due to torque.
If you want to get electric without cost of replacing what's installed you could get a front hub motor. I'm in the middle of installing one myself with derailleur gears.
I've read that you can disable the coaster brake on nexus 7 but it seems like a bit of a faff. So just install hub motor and hold out til a good alfine 8 or similar comes along 2nd hand?
Nobody able to answer this one?