I have a Kestrel road bike that I want to convert to a Tri bike with aerobars etc. I bought the bars, brakes and shifters but I havent done the conversion yet because I haven't figured out how to route the cables thru the frame once the old ones are removed. Any help would be greatly appreciated.

When I got my old Kestrel 4000 back from Kestrel (they repaired a crack and repainted it back in the mid-1990s) there were "pull strings" (fishing line I think) to pull in the cables with. It was a long time ago, but I think I just taped the cable to the string and pulled it through. So, you could attach a pull string to the old cable before pulling out the old cable. Pull the string in and use it to pull the new cable in.

Come to think of it, I'll need to do this soon. The 4000 is now my wife's bike (I went back to steel after cracking it) and I just got her some cross stop levers to add so the rear brake cable needs to come out and go back in. I'm open to any other tricks and ideas this thread may produce.

If Kestrel still existed in nearby Watsonville, CA., I would ask them, but they are gone now. Only the name lives on.

The easiest way to do this is to leave the inner wires in place when you pull out the old housing. Then use the wire as a guide to rethread the new housing back through the frame.

I thought of that but the housing doesnt go all the way thru the frame. It has "stops" where it enters the frame and where it exits the frame. I like the fishing line idea (see above)

OK, I never saw internal cables done like that so this is new to me. All the other internal cables I've dealt with run the housing completely through the top tube and out at the front and rear.