2007 Cannondale SystemSix Team Si

Externally until they hit the BB- I'd love to go into the frame from the junction box, but there was just no good way to do it that I could think of.

Drilling the existing cable guides on the head tube was suggested to make entry points into the frame- they are bonded and riveted in place.

That would mean that the frame could not be converted back to a cable operated system at some point in the future however, and this bike is likely to end up as the training frame ultimately.

How about 1 hole in the top tube like a Cervelo?

If I was going to do that I'd want to run the SRM wires internally also, and they've got a fairly large connector on the end.

This isn't such an issue with the DA Di2 as you can cut and rejoin it, but the SRM harness is shielded, and (apparently, I've not seen this personally) if you cut it and rejoin it, is prone to picking up signals from other sources.

I don't know, I'd like to do it, but it seems a lot less risky to just use the Shimano frame attachment stickers as I have at the moment.

Nothing amazing happens with safe options.

True, where's my 16mm drill-bit?

frame failure doesn't happen with safe options.

ftfy ;)

What is it, and how much does it weigh?

Battery pack, and 63g apparently.

Just have a massive dump prior to setting off.

Battery pack, and 63g apparently.

Just have a massive dump prior to setting off.

Wouldn't ten of them be the same weight as the bike?

Have you been weighing your turds Neil?

No, that's a rather charming Photoshop that someone has created, I wouldn't use my bicycle parts scales for poo weighing- that would be laughable.

Photoshop? are you sure, if it is the quality of the workmanship is very high, the person who made it must be very skilled....

I've seen plenty before, and to the trained eye there is a giveaway in some of the pixels.

I'm a loose cannon when it comes to giveaway pixels

So it's finally happened, someone's weighed King Kong's finger.

Probably overkill, as these connectors are considerably more water tight than the Di2 ones, but better safe than sorry.

but are they heaver?

but are they heaver?

here, you dropped an 'i'

i'd be more concerned about the termination at the 'loose' ends

but are they heaver?

squeeze out a little more poo

here, you dropped an 'i'

i'd be more concerned about the termination at the 'loose' ends

Soldered and then heat shrink used to seal the join, which is going to be inside the seat tube.

The only way I can see water getting to the new section of harness will be down the seat tube around the seat post, and that's a fairly tight seal.

We'll see- I never ride this bike in the rain, so that should help.

Probably overkill, as these connectors are considerably more water tight than the Di2 ones, but better safe than sorry.

I never ride this bike in the rain, so that should help.

So why the concern about making them more water tight? Or do we need pictures of flasks of pee on scales too?

You're quite right James- what was I thinking!

I'll just loosely twist the wires together and leave it at that- after all, what's the worst that could happen?

the problem with solder is that it's more affected by vibration and if it cracks then you'll have a flexing dry joint under the heat shrink; with intermittent faults cropping up - most annoying!

twisting, heatshrinking then strain relieving may offer a more durable connection

That would be annoying- I had to re-flow the solder on my ABS ECU as the joints dried out and cracked. (Wrong terminology there I suspect)

I cannot bring myself to believe that twisting is "proper", how about very small terminal blocks?

fine cable strands shear pretty quickly after fatigue cycling at the clamp point. unfortunately a few bike rides can subject the joint to lots of vibration.

using a dollop of electrical contact (carbon) grease, twist the two sets of filaments together, then encapsulate in heat shrink, then using the slots at each end of a 60mm tyco cable legend holder, ty-wrap both cable outers

example cable legend (marker) holder: