Di2 7970 system for flatbar, I need the Di2 experts please

Discuss light weight issues concerning road bikes & parts.
yumseyo
Posts: 115
Joined: Tue May 12, 2009 12:25 am
Location: San Francisco

by yumseyo

Hi all, I just acquired a set of Di2 7970's. I want to install the system on a flatbar. Suggestions ? I wanted to know if SW 7971 switches would work without the brake lever / shifter combination and what would be a good way to mount them. I saw the link below, but don't know what system it was and how it was wired. Thanks in advance...

https://www.google.com/search?q=di2+on+ ... B800%3B471

BikeNerd2453
Posts: 343
Joined: Wed Jun 25, 2008 6:08 am

by BikeNerd2453

yumseyo wrote:Hi all, I just acquired a set of Di2 7970's. I want to install the system on a flatbar. Suggestions ? I wanted to know if SW 7971 switches would work without the brake lever / shifter combination and what would be a good way to mount them. I saw the link below, but don't know what system it was and how it was wired. Thanks in advance...



Good place to start: http://www.ki2bike.com/

They make shifters that use the Shimano climbing switch guts, don't know if it'll shift the FD on the 7970 though...

manninen
Posts: 32
Joined: Fri Jan 28, 2011 8:02 am

by manninen

with 7970 you can use pretty much every momentary switch you want.

https://dl.dropboxusercontent.com/u/33080121/pre%20historic/sram.jpg

i had switches paired with S500 sram hoods, i did not like wire brakes so i have now old di2 with R785 levers

goodboyr
Posts: 1388
Joined: Wed Jan 10, 2007 10:56 pm
Location: Canada

by goodboyr

7970 is the older non e tube system so there's no need to get too sophisticated. You can use any momentary switch to mimic the shifters. I've used the cateye remote buttons successfully. You just need to have good soldering and wire stripping skills. There's a thread on the fairwheel bike forum where there's a ton of info including schematics and alternative switches.

manninen
Posts: 32
Joined: Fri Jan 28, 2011 8:02 am

by manninen

yeah

http://fairwheelbikes.com/forum/viewtop ... f=3&t=7580

thats my project but i´ve lost some schematics

goodboyr
Posts: 1388
Joined: Wed Jan 10, 2007 10:56 pm
Location: Canada

by goodboyr

I'm away from my computer at the moment but as soon as I can will dig up the drawing link.
Actually that post has it all. Happy reading. The new e tube stuff made this an obsolete knowledge. The beauty of 7970 was the easy hacking! Good times.

goodboyr
Posts: 1388
Joined: Wed Jan 10, 2007 10:56 pm
Location: Canada

by goodboyr

And this thread was the one that inspired me to my first internalize job on a 2006 r3. After that I've done probably 10 bikes including a look 595.

viewtopic.php?t=67791

Dammit
Posts: 443
Joined: Sun Mar 27, 2011 8:16 pm

by Dammit

We played around with an old 7970 group for our show bike- good fun, and as you say, the beauty of the first generation stuff was that you could do this stuff:

Image

More here: http://talbotframeworks.co.uk/bikes/dalsnibba/

Geoff
Posts: 5098
Joined: Sat Dec 13, 2003 2:25 am
Location: Canada

by Geoff

Ok, that's cool...

Dammit
Posts: 443
Joined: Sun Mar 27, 2011 8:16 pm

by Dammit

We wanted to make a point of the steel frame- hence the ground "wire" is the frame.

It was a fun project, we're in the middle or doing a second one with 9070- using gold leaf under the paint, which is an old hot-rodder technique.

yumseyo
Posts: 115
Joined: Tue May 12, 2009 12:25 am
Location: San Francisco

by yumseyo

That paint on wiring of Talbots show bike is really nice. How did you get the lines so straight?

Thanks all for your fine threads too.

I've decided to go with cat eye buttons, could anyone sound in on the correct wiring for them if I were to remove the connector going to the main shifters and cut it off before the connector (just in case I need to splice them back). I think there should be 4 wires from the shimano connector and only two coming out of each cat eye switch. I will be purchasing two sets, one for each side, and want to mount them on the flatbar somehow. (two sided tape?). Thanks in advance..

Dammit
Posts: 443
Joined: Sun Mar 27, 2011 8:16 pm

by Dammit

We used a fellow whose normal work is pin striping race cars, custom motorcycles etc- very nice chap.

goodboyr
Posts: 1388
Joined: Wed Jan 10, 2007 10:56 pm
Location: Canada

by goodboyr

See the thread here and my entry specifically for how to wire the buttons.

http://fairwheelbikes.com/forum/viewtop ... f=3&t=7817

yumseyo
Posts: 115
Joined: Tue May 12, 2009 12:25 am
Location: San Francisco

by yumseyo

goodboyr wrote:See the thread here and my entry specifically for how to wire the buttons.

http://fairwheelbikes.com/forum/viewtop ... f=3&t=7817


Well, I got 2 pair of cateye 300z switches for 20.00 ! and just got a pair of cable extensions for 20.00. $40.00 will be a lot cheaper than the sw7971 switch I was going to buy for $225.00 and still had to figure out how to mount them. Thank you so much "goodboyr" !!!

Can you give me some suggestions on mounting them on a flat bar? Can't blame a guy for trying...hee hee... :D

goodboyr
Posts: 1388
Joined: Wed Jan 10, 2007 10:56 pm
Location: Canada

by goodboyr

Ha! That part I don't know. However we have just uses silicone seal to glue the bare buttons to the under side of road bars with flat sections (3t ergonova). So you've got lots of options.

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