mrandmrspoves
Middle aged bald git.
- Location
- Narfuk
That is correct - (but only if the cable is tight enough to pull the FD up to the middle and large chainrings correctly)
Triple dropping straight to small ring?
- Thread starter Tommy2
- Start date
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That is correct - (but only if the cable is tight enough to pull the FD up to the middle and large chainrings correctly)
Ajax Bay
Guru
- Location
- East Devon
All materials stretch when a strain is induced therein. A cable stretches every time it is operated and returns to its original dimension when the lever is released (removing the tension). Which is why I said: "they stretch the same amount every time (the same amount of) tension is applied". Take your point about the outers grooving, which is why it's prudent to change outers at the same time one changes the inner.
mythste
Veteran
- Location
- Manchester
Not sure I agree on this (though I suppose it's irrelevant to the OP but I find these topics interesting!)
So you're suggesting that stainless steel shows elastic properties under the loads that a derailleur requires? I'm sceptical. Be curious to see what @Yellow Saddle thinks.
Ajax Bay
Guru
- Location
- East Devon
Yes. Young's Modulus for stainless steel is circa 200 GPa, so 10 kg wt (force) would stretch the cable 2 nanometres (if the cable was 1m long (say)), if I've got my assumptions and maths right. And then return to its original length when the tension is released. You may accuse me of splitting hairs: but this is in quite a different league!
- Location
- London
Been looking for one, though managed last time to, by mistake, buy a thing which slots into a downtube cable stop, which I don't have.
Can you recommend such a thing? with link if possible?
I have heard some folk criticise them though? Introducing an extra complication/somewhere for muck and water to enter the system maybe?
U
User6179
Guest
I just used one off a brake at the downtube stop .
- Location
- London
sorry, don't understand this. That pic looks like something totally in-line, no stop.
U
User6179
Guest
Sorry ,that was just a pic off google search for the OP , not mine , I just used a brake adjuster on the downtube stop.
U
User6179
Guest
Google shimano sm-ca70
- Location
- London
thanks eddy
To revisit this, this video show me clicking the shifter to the big ring then clicking down just once but as I release the downshift it clicks again and releases all tension on the cable as if something is worn or broken in the shifter and is not engaging in the middle ring postion like it's skipping over a worn stop.
View: https://youtu.be/FOpT-PuIEWs
View: https://youtu.be/FOpT-PuIEWs
As said, adjust the cable tension but also check the height and the angle. if it's never worked from the beginning, it may not have been set up right.
http://www.parktool.com/blog/repair-help/front-derailleur-adjustment#article-section-7
http://www.parktool.com/blog/repair-help/front-derailleur-adjustment#article-section-7
