I have a few questions pertaining to chains and my conversion overall from single speed to "multi" speed.

1) I have Shimano 105 9 speed 5501 shifters. It came from a triple setup, but I was wondering if this shifter is double compatible w/o me accidentally shifting to a ring that's nonexistent.

2) For a triple setup, how many link chain should I be looking for? What about a double setup?

3) Has anyone tried different chains and noticed a big difference between the chains? There are some Dura Ace chains at my LBS for about $50, and then there are "generic" Shimano 9 speed chains for just $18. Please also recommend any other 9 speed chains of decent quality/price.

4) How much does cable and housing cost for a conversion like this?

5) Is it difficult to put everything together on my own? Or is it recommended that I bring everything to an LBS to set it up?

1. Your triple shifter should be compatible with a double setup.

2. There aren't separate chains for doubles and triples. New chains come longer than you need and you're meant to cut them down to the proper length, which can be accomplished by a few different methods. Park Tool is always a good place to start: https://parktool.com/repair/readhowto.asp?id=26.

3. I've used SRAM and Shimano chains of comparable quality and have never really noticed any difference. As for, say 105 vs. Dura Ace in Shimano chains, the main difference tends to be weight. If you're looking to cut weight that's fine, but in terms of dollars spent to grams saved, the chain isn't the most effective place to start, so I'd personally buy the cheaper chain.

4. It depends. Here's a good place to start: https://www.performancebike.com/bikes..._400002_400247. They also have a shifter combo for the same price.

5. I wouldn't say it's all that difficult, and it's definitely worth your while to learn. Find your way around the Park Tool website and give it a shot. You can always take it to the shop when you're done and have them make sure you did it right.