Di2 TT build, small parts not to forget
Moderator: robbosmans
- Tinea Pedis
- Posts: 8616
- Joined: Sat Mar 14, 2009 6:08 am
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My first Di2 build - and a TT bike (Argon18 E-118) at that. Having to assemble the build myself, keen to avoid getting to the day of putting it together and forgetting something basic.
Will be 6870 e-tube. Have junction box, but unsure of:
- wiring kit needed (SM-EW79A-E ?)
- battery kit
- bar end shifters (I recall 6770 shifters can be upgraded to 11sp?)
Feel like a dinosaur doing this. Cables so much more simple
Will be 6870 e-tube. Have junction box, but unsure of:
- wiring kit needed (SM-EW79A-E ?)
- battery kit
- bar end shifters (I recall 6770 shifters can be upgraded to 11sp?)
Feel like a dinosaur doing this. Cables so much more simple
There are some good resources to help you plan. You use E tube wiring to connect up all your devices. All e tube wires are the same, you just choose the length you need. The component you've quoted is for the older system. Newer E tube systems use EW90 Junction connection at the front. See attached as a good start:
http://si.shimano.com/php/download.php?file=pdf/dm/DM-DA0001-04-ENG.pdf
http://si.shimano.com/php/download.php?file=pdf/dm/DM-DA0001-04-ENG.pdf
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- Pokerface07
- Posts: 213
- Joined: Wed Jun 06, 2012 11:43 pm
Assuming this is 11-speed?
6870 Front Mech
6870 Rear Mech
R671 TT shifters
ST-6871 Brake Levers/Shifters (optional)
Junction A (which you have). You need a 3-port one if you're not using the brake lever shifters. You need a 5-port one if using both the brake levels and the extension shifters.
SM-JC41 Junction B (little small 4-port that goes at BB)
Cables:
1 x 1000mm from junction A to Junction B (at BB usually)
1 x 650mm junction B to rear mech
1 x 400mm junction B to front mech
1 x 600mm junction B to internal battery (or external, depending on your choice)
Will also need a battery. Seat-tube one is SMBTR2 Di2 E-tube Battery. External one needs a frame mount.
That's all the bits you should need, plus usual stuff life brake cables, etc.
6870 Front Mech
6870 Rear Mech
R671 TT shifters
ST-6871 Brake Levers/Shifters (optional)
Junction A (which you have). You need a 3-port one if you're not using the brake lever shifters. You need a 5-port one if using both the brake levels and the extension shifters.
SM-JC41 Junction B (little small 4-port that goes at BB)
Cables:
1 x 1000mm from junction A to Junction B (at BB usually)
1 x 650mm junction B to rear mech
1 x 400mm junction B to front mech
1 x 600mm junction B to internal battery (or external, depending on your choice)
Will also need a battery. Seat-tube one is SMBTR2 Di2 E-tube Battery. External one needs a frame mount.
That's all the bits you should need, plus usual stuff life brake cables, etc.
Twitter: @FormerTTchamp https://twitter.com/FormerTTchamp
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- Posts: 235
- Joined: Tue Feb 28, 2012 9:13 pm
Also, another option instead of the R671 shifters are the SW 9071 shifters. They are a one button design that only controls the rear mech. I prefer the shape of them when compared to the two button design. Never really feel I need to shift the front mech when in the extensions.
- Pokerface07
- Posts: 213
- Joined: Wed Jun 06, 2012 11:43 pm
hornedfrog wrote:Also, another option instead of the R671 shifters are the SW 9071 shifters. They are a one button design that only controls the rear mech. I prefer the shape of them when compared to the two button design. Never really feel I need to shift the front mech when in the extensions.
Only if you have the brake lever shifters of course! My TT bike doesn't have them so I personally need to shifter from the extensions.
Twitter: @FormerTTchamp https://twitter.com/FormerTTchamp
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- Posts: 235
- Joined: Tue Feb 28, 2012 9:13 pm
Thanks, forgot to mention that as the 118s come stock with TRP levers if I remember correctly...
- Tinea Pedis
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Many thanks.
- Tinea Pedis
- Posts: 8616
- Joined: Sat Mar 14, 2009 6:08 am
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So I picked up a 7970 Di2 TT kit, only previous owner was running an internal battery (parts came out of a BMC TM01).
Having some difficulty working out what battery mount I'll need. Or even internal battery. This is a shot of where the mount is (so assuming it's a short bracket).
Having some difficulty working out what battery mount I'll need. Or even internal battery. This is a shot of where the mount is (so assuming it's a short bracket).
- Tinea Pedis
- Posts: 8616
- Joined: Sat Mar 14, 2009 6:08 am
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Aware that they're not compatible.
But, as mentioned, picked up a cheap 7970 Di2 kit so using that instead. I might now have access to a short mount bracket, so will run with that instead of worrying about an internal one.
But, as mentioned, picked up a cheap 7970 Di2 kit so using that instead. I might now have access to a short mount bracket, so will run with that instead of worrying about an internal one.
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