OK bike is my Mt Bike. Rocky Mountain Element
I need to replace the rear shift cable, i know i done it before, but things not working right
i took old cable out and slide it through, i just put new cable to my shifter
so on the bike its the inner tube cable system, from the down tube,
seems to be an issue when i slide new cable in, even same problem when tried with old cable, its goes in ok, but seems to get stuck somewhere, and i have good length of cable going into bike,

any tips or suggestions on what i can do to undo the jam or whatever is happening? does this sound like common problem?

First thought is that the cable casing has a rusted plug or a crushed spot that prevent the inner cable from passing through. But replacing the casing is pretty easy to do so if this the issue the fix is simple. BTW photos would help us better understand the question as your terms and phrasing are not what we usually use. Andy

Sounds like he's having issues with it getting lost in internal routing...?

​​​​​​​definitely need pictures.

i get photos later but doesn't seem to be any housing i can replace easily if any .its more less a snag. as in when i slide the cable in from either side .it gets snagged. any tips or anything be helpful

There is no internal casing to change its all metal when i put the cable through the hole from the top tube or even at the bottom, there must be someone else with similar situation? please??

Ah, you have internal cable routing. Sorry to hear of that. This make all efforts all the more blind or challenging (as in a solution looking for a problem. External routing worked fine for decades and is easy to trouble shoot). Sorry that from your OP I didn't catch on to the internal routing.

Just the same you have to break down the cable system into smaller portions/lengths. If you ran the cable through the frame but not via the casing from the bars what happens? What about the cable running through only the casing? It's easy to miss route the cable in a frame such that it travels around some aspect wrongly, like gets intertwined with the other cable. Some internal routings really want a low friction cable sleeve in the frame to reduce the going around curves or into/out of the ports friction.

Without the bike in front of me I can't do much more then offer typical problems. Andy

would photos work?

Yep.

ok here are some photos

photo of whole bike


that is at bb. the part on right side is where gear cable goes through the left is the front gear cable housing.

that is the hole for cable goes through From the top

ok guys hope this helps. all suggest ions please

Why not just install new housing externally and solve the issue?

Have you tried blowing it out with compressed air? Possibly some debris in there.

No external housing? how would i connect the housing though, if the bike is set up as inner? should i use zip ties around the frame? or just use a long long housing around the frame to secure? suggestions?

I could be wrong but doesn't the cable stop in the BB shell pop out? This could give you more access to see where the problem is.

The housing would need to end in a stop, they have bolt on stops which I have used in similar situations, something like this, you would need to measure the diameter of the frame section where it is mounted to get the right rize.
https://www.ebay.com/itm/Cyclist-Cho...ble+stop&rt=nc

Yes you could used zip ties to secure the housing to the frame or they also have clamps specifically designed for this, like this type for example
https://www.ebay.com/itm/4Pcs-34-9mm...sid=m570.l1313

Odd construction.

Best I can tell, the left rear brake cable is routed externally with housing the whole length.

The shifter cables, however, are installed internally.

That would be my first step, see what could be popped off or unscrewed for better access.

One can measure how much cable goes in to determine where it is getting stuck.

Assuming some kind of factory internal housing, perhaps it can be punched out with a stiff wire. I'm not sure where one would get a real stiff wire, but perhaps a choke cable from an auto parts store.