Tandem Rans Screamer BBSO2 Build

Show off your Ebike creation here.
Post Reply
BikeFiver   1 mW

1 mW
Posts: 13
Joined: Jan 22 2014 9:23pm

Tandem Rans Screamer BBSO2 Build

Post by BikeFiver » Feb 22 2016 9:36pm

I've become hooked on recumbent cycling and my wife only likes to tandem. The solution was to buy HER a Rans Screamer recumbent tandem for Mother's Day.
Screamer R Start.jpg
Screamer R Start.jpg (58.94 KiB) Viewed 1060 times
Screamer L Start.jpg
Screamer L Start.jpg (55.72 KiB) Viewed 1060 times
Then to make it even more fun, add a BBSO2 from EM3EV.
GreenLightening R.jpg
GreenLightening R.jpg (56.59 KiB) Viewed 1060 times
Green Lightening L.jpg
Green Lightening L.jpg (53.32 KiB) Viewed 1060 times
Here are some of the details. The rear axle needed some help staying in the drop out with all the power. So I made these.
Dropout R.jpg
Dropout R.jpg (73.28 KiB) Viewed 1060 times
Dropout L.jpg
Dropout L.jpg (81.23 KiB) Viewed 1060 times
The battery was a 50V 16.5 Ah triangle from EM3EV that needed a box. This was bent then cut in half to aid install and removal. OK, I made it too wide initially, so I cut it in half, folded 1/2in in on both halves, mounted half to the bike and bolted the other half in a snug fit. Lemonade from lemons.
Battery Box.jpg
Battery Box.jpg (74.85 KiB) Viewed 1060 times
This is how the bike is changed to a right drive tandem. The outer chainring is 52t the drive chainring is 54t. This is accomplished with a "race triple chainring bolt" and spacer as described by Harris Cycles. I have upgraded the BBSO2 to a DropStop 52 chainring, to decrease chain slips, using a 130 adapter from California Ebikes.
Bottom Bracket.jpg
Bottom Bracket.jpg (82.47 KiB) Viewed 1055 times
My wife loves riding HER tandem with me, especially electrified.

User avatar
striider   100 W

100 W
Posts: 145
Joined: Apr 06 2015 1:02am
Location: Aurora, CO

Re: Tandem Rans Screamer BBSO2 Build

Post by striider » Mar 28 2016 5:44am

VERY nicely done! I am int he process of electrifying a Rans V2 similar to your other build you posted with a hub motor. Torque arms are non existent as far as I can tell. I like your solution above, I think that would be plenty for a hub motor. Any chance you machined a couple of extra plates to sell? ;)

Post Reply