I have a similar setup, yet have the junction placed in the fork steerer tube. It's just a matter of popping off the top cap of the stem to charge.

I'm thinking of jumping on the AR bandwagon, especially now that they have a rebate on the AR3/5. Are the any problems with upgrading an AR5 to a full Ultegra Di2 groupset? Everything looks straightforward although I'm unsure of the FSA bottom bracket. I assume/hope that since there's already a 105 crankset in the 2016 bikes it will be a "drop in" replacement but I'm no expert. This seems like a great way to get a "poor man's AR2" for around $3k ($2199 for the bike with rebate, ~$1100 for the complete Di2 groupset).

Anything else I'd need to be aware of in doing a "find and replace" of 105 with Di2? I've built up bikes before, just not with electronic shifting.

I'm looking to order some new carbon wheels and wondering what widths work with the ar frame? Can I get away with a max width of 28mm wheel or do I need something smaller?

My Stingers are 28 and some change and fit with lots of clearance. I also run some 28 tubies on some other rims with no issues.

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I have ran both a zipp FC 303 with 24mm and a FC 808 with 27mm (zipp tangent) with no rubbing.

Thanks!

Thanks!