Can't drop into the 2 smallest cogs

[davidphilips]

The wire is probably snagging in the outer. Release the rear mech clamp bolt and tug the wire. Then start the indexing process again.

Lol, This wire seems to be a common term now.

 

[Racing roadkill]

Cables cannot stretch.

They can, and do but ( admittedly) not much through the sorts of usage they’ll get on a bike. I’ve spent a lot of time over the years, stretching wires to destruction in order to generate Weibull distribution graphs, in order to determine their durability / nd values. They do actually stretch and contract a bit, even in usage on a bike, it’s that constant stretching and contraction that fatigues them. You’ll never get them to stretch past their elastic limit during usage on a bike though.

 

[Racing roadkill]

Lol, This wire seems to be a common term now.

If it’s good enough for the manufacturers, it’s good enough for me

 

[Yellow Saddle]

They can, and do but ( admittedly) not much through the sorts of usage they’ll get on a bike. I’ve spent a lot of time over the years, stretching wires to destruction in order to generate Weibull distribution graphs, in order to determine their durability / nd values. They do actually stretch and contract a bit, even in usage on a bike, it’s that constant stretching and contraction that fatigues them. You’ll never get them to stretch past their elastic limit during usage on a bike though.

Cables don't stretch.

 

[Racing roadkill]

Cables don't stretch.

They do, trust me, they really do, given enough of a pull.

 

[boydj]

They do, trust me, they really do, given enough of a pull.

You can't exert that amount of force with a cycle shifter.

 

[Yellow Saddle]

They do, trust me, they really do, given enough of a pull.

I can't trust you.

 

[midlife]

https://www.frasersdirectory.com/redwire/facts-wire-rope-stretch-144226481200/

Are wire ropes the same as cables for bikes?

 

[Yellow Saddle]

https://www.frasersdirectory.com/redwire/facts-wire-rope-stretch-144226481200/

Are wire ropes the same as cables for bikes?

Yes, they are, but lets stick to the context.

The context is plastic deformation in wire rope used on bicycle gear change systems.

 

[SkipdiverJohn]

A one year old bike should not have frayed cables unless it was ridden round the world in that year. I've got 30 year old bikes which are, in all probability, still running on their factory-fitted cables. I suspect this is a lack of lubrication/sticktion issue more than anything. Wire ropes, which is what gear and brake cables are, do not stretch to any meaningful extent. If anything changes, it's the outers that move position inside ferrules, or get bent and kinked. Sometimes my hack bikes get sticky cables from being left outside, if not ridden regularly enough. The spray lube aerosol and oil can followed by a ride, soon remedies the problem

 

[C R]

Yes, they are, but lets stick to the context.

The context is plastic deformation in wire rope used on bicycle gear change systems.

To be fair to @Racing roadkill, he did say that bicycle cables do not stretch beyond the elastic limit under normal use.

 

[Ming the Merciless]

Which don't use cables?

Don't rely on getting cable tension right.

 

[fossyant]

New cables, especially if the bike has been un-used. Makes a big difference.

 

[Mike Ayling]

Which don't use cables?

Yes it does, there are two, one for upshifting and one for downshifting so in every change you pull cable until the bit in the hub goes click and your gear changes. When not in use the cables remain slightly slack.
Now with a derailleur (if it is not a shadow model) to get up to higher gears i.e.1,2,3 etc the shifter releases the cable and if there is anything sticky in the cable runs "there is a problem Houston"

Mike

 

[Mike Ayling]

Don't rely on getting cable tension right.

Absolutely!

Mike