Originally Posted by
F red
I have a bike with 4400 Tiagras, and 5500 105s, and I'm trying to find the right wire harness for them.
That doses't tell us much, you need to be real specific if asking this type of question, what are you STI you are using, rather than just saying what the bike has as a whole.
Originally Posted by
F red
So far I've ended up with wire harnesses that people will say will work, but neither seem compatible.
Have you tried going to the source, rather than going with what people say will work?
http://techdocs.shimano.com/media/te...9830686508.pdf
Being as what you are looking at is old, think 13 years since introduction, and 7 since they were discontinued, getting the correct ones unless NOS may be an issue.