I wanted to get some lower gears on my 2007 Fantom Cross. It came with 9 speed 12/26 and 39/48 rings on 130 BCD crankset, so I couldn't put smaller ring on. It has Tiagra shifters, ST 4500 I believe, and came with RD 5600 (105 10-speed) derailleur. I've often read that all Shimano 9 speed shifters and RD are compatible, so... I bought and installed CS-HG400-9 (11/36) and Alivio RD-M4000 SGS 9-speed derailleur. After straightening hanger and much adjustment, it still won't shift properly. Shifters are not pulling enough cable. The 9-speed road shifters aren't compatible with 9-speed MTB derailleur. What's my best option at this point? I really want those lower gears, but don't want to spend a fortune on an old but beloved bike.