HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Articles FAQ Contact About




Post new topic Reply to topic  [ 15 posts ] 
Author Message
PostPosted: Wed Dec 26, 2012 5:02 pm 
Offline

Joined: Mon Jan 07, 2008 9:09 am
Posts: 94
Location: England
:mrgreen: Hi

I built my bike last year with Dura Ace Di2 and used the internal wiring harness which was a treat to fit and use.

I would like to have a new frame for 2013 and reuse the Di2 groupset and wiring harness.

The only dilema i have is removing the heat shrinking tubes which go over the junction box connectors
to weather proof them.

Does anyone have any experience removing the sleeves ? or can suggest a way that would enable me to re use the harness
rather than have to buy a new one.

Thanks.

Nelson :)


Top
 Profile  
 
PostPosted: Wed Dec 26, 2012 5:18 pm 
Offline

Joined: Fri Mar 09, 2007 1:26 am
Posts: 452
Location: USA
Carefully cut them with a sharp razor blade. I have did this a couple of times and no issues. Just make sure you cut in to out.


Top
 Profile  
 
Posted: Wed Dec 26, 2012 5:18 pm 


Top
  
 
PostPosted: Wed Dec 26, 2012 5:58 pm 
Offline

Joined: Mon Jan 07, 2008 9:09 am
Posts: 94
Location: England
Thanks for the advice.

What do you mean exactly "Just make sure you cut in to out." ?

I wondered about re heating the tubes to re activate the glue and then perhaps they would pull off.
Can you get new heat shrink tubes from Shimano or did you use commercially available heat shrink tubes from an
electronics store ?
Thanks

Nelson


Top
 Profile  
 
PostPosted: Wed Dec 26, 2012 8:16 pm 
Offline
Shop Owner
User avatar

Joined: Sun Feb 06, 2005 4:22 pm
Posts: 3561
Location: Tucson, Az.
I've done this a lot as well, upside is right just use a sharp razor blade. I think he meant to say just make sure you don't cut into the wires themselves.

You can buy more from Shimano but it's easier to just buy it locally from an electronics supplier.

_________________
Fair Wheel Bikes

Fair Wheel Blog

Friend me on Facebook for behind the scenes updates


Top
 Profile  
 
PostPosted: Wed Dec 26, 2012 8:37 pm 
Offline

Joined: Mon Jan 07, 2008 9:09 am
Posts: 94
Location: England
Thanks for your advice i will remove the groupset and use it on my
new build in the spring.

Nelson


Top
 Profile  
 
PostPosted: Wed Dec 26, 2012 10:08 pm 
Offline

Joined: Fri Mar 09, 2007 1:26 am
Posts: 452
Location: USA
You can purchase the shrink wrap at a local hardware store. The stores usually have it in different diameters. Have fun


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 12:09 am 
Offline

Joined: Wed Jan 10, 2007 10:56 pm
Posts: 664
Location: Canada
Just make sure you buy the glue lined double wall heat shrink. That's the same type used in the di2. The regular stuff is not water proof.


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 3:47 am 
Offline
Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1976
Location: NoVA/DC
I've never seen adhesive lined heat shrink at any hardware store, or electronics store for that matter. Google and Amazon worked for me in the past, though.


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 5:02 am 
Offline

Joined: Wed Oct 06, 2010 3:38 am
Posts: 92
do what the pro teams do--just use a few wraps of electrical tape on the connectors.

seriously--how much water do you expect the INSIDE of your frame will see?


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 8:22 am 
Offline

Joined: Wed Feb 09, 2005 4:51 am
Posts: 1725
goodboyr wrote:
Just make sure you buy the glue lined double wall heat shrink. That's the same type used in the di2. The regular stuff is not water proof.


Is there such a thing ? I fixed the Di2 harnesses myself, never noticed that there was glue on the inside. Didn't notice it when I took them apart last month either. :noidea: :unbelievable:

In any case, there is no need for 'double walled' heat shrink, you may encounter some issues with some frames if you do that. But just make sure you get those that are ~6.5mm diameter, with a 90% shrink capacity ( they cost almost 3x the normal 50% shrink types) .

Also, note the o-rings that are already on the harness, just don't damage them as they help to seal off the heat shrink for you.


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 1:49 pm 
Offline

Joined: Wed Jan 10, 2007 10:56 pm
Posts: 664
Location: Canada
Get the stuff at auto parts stores. And just cuz its "double walled" doesn't change its diameter or shrink. But of course this is the good old interweb, where people love to express definitive opinions about stuff they don't actually know. If you read the shimano instructions for the wiring harness you will realize they use glue lined heat shrink. Whether you want to take a chance with a wiring harness inside your frame and is a bitch to remove is your business. As for water in your frame, well that depends on the frame and whether you ride in the rain and wash your bike. I certainly drain water out of my frame after that.


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 2:41 pm 
Offline
Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1976
Location: NoVA/DC
Nobody implied a corollation between wall thickness and shrink ability.
Separately, I doubt Shimano's own heat shrink reduces 90%, I would have assumed it's typical 2:1, 3:1 at most. It is quite a bit thicker than off the shelf stuff, but as mentioned earlier, some entry holes are a tough fit as they are.


Top
 Profile  
 
PostPosted: Thu Dec 27, 2012 2:56 pm 
Offline

Joined: Wed Jan 10, 2007 10:56 pm
Posts: 664
Location: Canada
"You may encounter some issues with frames if you do that"
The 3M thin walled adhesive lined stuff has a 3:1 shrink ratio.


Top
 Profile  
 
PostPosted: Fri Dec 28, 2012 2:37 am 
Offline

Joined: Wed Feb 09, 2005 4:51 am
Posts: 1725
goodboyr wrote:
Just make sure you buy the glue lined double wall heat shrink. That's the same type used in the di2. The regular stuff is not water proof.


Dug up my old harness instructions and yes indeed there was mention of glue being on the tubes. :shock:
But its something which I have never noticed seriously as I've done and redone the same set of harnesses 2 times and helped another friend set up his. :oops:


As for the double thickness types, its a fact, that some frames will have barely enough clearance for the connectors, with a double thickness heatshrink, you'll get into problems, especially in the chainstay portion. A thin walled, high shrinkage heatshrink tube would be the best.


Top
 Profile  
 
Posted: Fri Dec 28, 2012 2:37 am 


Top
  
 
PostPosted: Fri Dec 28, 2012 2:49 am 
Offline

Joined: Wed Feb 09, 2005 4:51 am
Posts: 1725
thisisatest wrote:
Nobody implied a corollation between wall thickness and shrink ability.
Separately, I doubt Shimano's own heat shrink reduces 90%, I would have assumed it's typical 2:1, 3:1 at most. It is quite a bit thicker than off the shelf stuff, but as mentioned earlier, some entry holes are a tough fit as they are.


I doubt they do either. But its a claim I saw at a local electronics supply shop I saw a few ago. As far a quality heatshrink goes, the best available ones are about 4:1.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ] 


Who is online

Users browsing this forum: Bing [Bot], cyclenutnz, finner, Google Adsense [Bot], Zitter and 45 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
This topic is locked, you cannot edit posts or make further replies. Will a 7970 wiring harness work with 6770 hardware??

in Road

hillrider

1

298

Sat Aug 09, 2014 12:44 am

upside View the latest post

There are no new unread posts for this topic. Di2 internal wiring, stopping the rattling

in Road

Calnago

9

1076

Sun Feb 16, 2014 10:03 am

11.4 View the latest post

There are no new unread posts for this topic. Di2 Cat eye wiring problem

in Road

yumseyo

4

383

Wed Aug 06, 2014 8:54 pm

yumseyo View the latest post

There are no new unread posts for this topic. rubber di2 grommets for in frame wiring

in Road

yumseyo

11

689

Fri Aug 15, 2014 7:55 pm

yumseyo View the latest post

There are no new unread posts for this topic. Di2 wiring to match white cables

[ Go to page: 1, 2 ]

in Road

Timmy269

22

885

Fri Dec 19, 2014 5:35 pm

WheresWaldo View the latest post


It is currently Mon Dec 22, 2014 7:51 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB