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Re: I'm a champion bike mechanic...

Posted: Tue Oct 24, 2017 8:23 am
by g-boaf
Duck! wrote:
g-boaf wrote:Upgraded a Giant TCR Advanced SL1 from mechanical Dura Ace 9000 to SRAM Red E-Tap. Working great, except I now have holes in the frame where the mechanical gear cables used to go.

I know there are rubber caps to go in these three holes (two at the front, one at the back) but I've been unable to locate any of them, not from Giant stores or anywhere else.

Anyone know where I could find them? At the moment I've just got tape over them to stop anything getting inside the frame.

I was given a couple of non Giant ones which didn't end up fitting at all.

I have a collection of assorted grommets and plugs. Ping me some pics of the apprpiate holes & I'll see what I've got.


Hi,

This is at the front:

Image

Didn't get one of the hole at the back (I forgot), but it's the same as for the 2013 TCR Advanced SL3 and the SL0. I'll photograph that tonight.

Re: I'm a champion bike mechanic...

Posted: Tue Oct 24, 2017 1:07 pm
by bychosis
Time to switch some parts around. "New" shiny wheels were to go from my temporary MTB. Took off the rotor and cassette ready to put it on my SS Trek, replacing some old, rusty nipples and flaky rim paint cheap wheels. Noticed that, while mostly looking new, the drive side spokes had all been trashed, assuming by a chain and cut about half way through. No spokes of suitable length in the parts bin.

Plan B pull the old wheels out of retirement. Looked them over, still good enough. I'd rebuilt with disc hubs several years ago and used them on a commuter bike. Appears that when I built them I got the rear wheel dish out. When installed the tyre was rubbing on the chainstay. Sure enough, when I flipped the rim around it rubbed on the other side. Time to get the spoke key out.

Re: I'm a champion bike mechanic...

Posted: Fri Nov 03, 2017 8:35 pm
by nezumi
After suffering the perennial problem of a broken rear shifter cable in my 5700 brifter, I finally had a replacement cable arrive today, and fitted it.

I managed to extract the broken cable quite easily by removing the side of the brifter, which made me quite happy. Once I did so, I became curious about the level of grease inside the unit. Should I make an attempt to clean this/flush it out? Is this possibly part of the cause of the cable breaking?

Since I was doing a quick fix on this one, I only replaced the cable inner and kept the same outer (and bar tape). I have known for a long time that the cables were wearing at the fork where they go around the headset to the stops on the underside of the downtube. What I realised today was that the cable outer is also being worn down, to the point that I can see some of the metal inside the outer.

Is it likely that I will be able to prevent this happening next time, or am I screwed? (pictures to follow).

On a happier note, I recently bought a fourth hand/cable stretcher tool, and found it to be awesome for setting up the rear mech for indexing.

Re: I'm a champion bike mechanic...

Posted: Fri Nov 03, 2017 9:27 pm
by Duck!
Cable breakage is not related to the type or quantity of lube in the shifter mechanism. It is entirely due to the fact that stainless steel, used for all quality gear cables, coated or not, work hardens and becomes brittle with repeated bending and straightening, such as around a shifter drum. It will occur, without exception, sooner or later in all models of shifters when stainless steel cables are used. Non-stainless cables are more resilient, but the friction is horrendous, and function exceptionally poorly in shifter designs that have a higher-friction cable route, such as the 7900/6700/5700 family.

Outer cables will also wear, especially with under-tape routing due to the relatively tight curve around the top of the bar. External wear is not particularly critical to shifting performance in most instances, although if it gets too bad the outer can split and then deform under inner cable tension. However by the time the outer layer gets that weak, the internal sleeve is pretty well munted anyway.

Re: I'm a champion bike mechanic...

Posted: Sat Nov 04, 2017 10:45 am
by li2099
nezumi wrote:
On a happier note, I recently bought a fourth hand/cable stretcher tool, and found it to be awesome for setting up the rear mech for indexing.

You know that could have saved my sore fingers from installing new shift cables and derailleurs this week.
I wonder why I always think I didn't need one.

Re: I'm a champion bike mechanic...

Posted: Sat Nov 11, 2017 5:44 am
by g-boaf
Replaced rear brake outer cable with Jagwire Links. And battled to get SRAM Red rear brakes to stay in centre. Job done I think.

The Jagwire Link system is more flexible and doesn't push the brake caliper off centre.

Re: I'm a champion bike mechanic...

Posted: Sat Nov 11, 2017 4:04 pm
by ValleyForge
g-boaf wrote:The Jagwire Link system is more flexible and doesn't push the brake caliper off centre.

I have a similar problem on one frame where the rear brake mount spins. You just have to tweak the length of the outer to get the right amount of "push". And then never touch it. Again. Ever. :shock:

Re: I'm a champion bike mechanic...

Posted: Sat Nov 11, 2017 5:40 pm
by g-boaf
ValleyForge wrote:
g-boaf wrote:The Jagwire Link system is more flexible and doesn't push the brake caliper off centre.

I have a similar problem on one frame where the rear brake mount spins. You just have to tweak the length of the outer to get the right amount of "push". And then never touch it. Again. Ever. :shock:


That's annoying when that happens.

My work seems to have done the trick. They are tricky to set up, but very powerful once done. Lucky I've got spare parts around to do this work.

Re: I'm a champion bike mechanic...

Posted: Thu Nov 16, 2017 9:03 am
by bychosis
Last week on my rough, MTB commute I heard a bit of a rattle noise and found the front QR skewer loose. This morning, same bike, heard a rattle. Stopped to see the back QR skewer in an odd position, because it too was loose.

Considering the rough terrain I'd been riding on, and the (small) jumps and drops it could have gone badly - twice.

Re: I'm a champion bike mechanic...

Posted: Sat Nov 18, 2017 8:21 am
by jasonc
i serviced the hubs on my wheels a couple of weeks ago. something was odd afterwards. when the wheel in the frame the chain would catch on the cassette when back-pedalling. so thursday a mate had time and we had a look at it. i'd put the axle in via the non-drive side rather than via the drive side. we eventually got the wheel apart and the axle in the right way. all working again