NAHBS 2013: Co-Motion’s City Bike Hacks Di2 with Gates Carbon Belt Drive

Co-Motion CityView Di2 Belt Drive Bike

Co-Motion isn’t known for building over the top show stoppers.  Rather, they bring stock models that represent a cross section of the bikes they build day in and day out.  This year, they showed the usual fleet of tandems and singles with one surprise up their sleeve.  Co-Motion put one of their CNC machines to use and produced an aluminum belt drive cog to work with the Alfine Di2 setup on their city bike.  It was well executed, so much so, that they took home $1000 prize from Shimano and Gates for the best Di2 Gates Belt Drive integration.

Push button shift your way pass the break for more images.

Co-Motion CityView Di2 Belt Drive Bike Custom Machined 28t Cog

To keep the gear range where they wanted it for a city bike, the aluminum center track cog was machined with 28 teeth.

Co-Motion CityView Di2 Belt Drive Bike Servo

Clearance is tight, but it works, and works well.  The guys at the shop had fun test riding the bike before the show, and ensured me there is no belt rub.

Co-Motion CityView Di2 Belt Drive Bike Battery Mount

This build uses the external battery.  The next iteration however, will make use of the new integrated seat post Di2 battery.

Co-Motion CityView Di2 Belt Drive Bike Shifter and Display

Co-Motion CityView Di2 Belt Drive Bike Internal Wiring Port

Co-Motion CityView Di2 Belt Drive Bike Ecentric BB

Thanks to the space inside the house made Co-Motion eccentric bottom bracket, they were able to run all the wiring internally. The wire enters the down tube, and isn’t see again until it exits the rear chain stay.

 

Comments

Patrick Ypperciel - 02/25/13 - 1:32pm

great looking bike if any, well specked , but Major Major toe overlap Issues for a city bike !!!

Slow Joe Crow - 02/25/13 - 1:37pm

@Patrick, it looks like a very small frame size based on head tube length and saddle to top tube proportion, which would explain the overlap issue.

Patrick Ypperciel - 02/25/13 - 3:22pm

@ slow joe crow are you behind this bike becaus it’s pretty darn good and i don’t mean to offend anyone perhaps size is a fact i’m only saying head angle is not helping , criterium head angles are not called for on a city bike this is not a track bike after all. Still it it is a pretty nice bike i guess it’s just the product manager in me talking !

Psi Squared - 02/25/13 - 3:48pm

I don’t think a 72° HTA has ever been considered a crit HTA.

dimples - 02/25/13 - 9:19pm

Small riders typically have small feet. Betcha toe overlap doesn’t really happen.

gringo - 02/26/13 - 2:19am

very nice bike but they dropped the ball with that external battery……

Nick Burklow - 02/26/13 - 8:35pm

@gringo – the integrated seat post battery wasn’t an option when the parts for the build were ordered. This build was in the works for a while.

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