Just bought my K2 Attack 2.0 about 2 weeks ago. got it for a steel because the crank needed replacing. I replaced the crank with a Truvativ 175mm crank with a 48/38/28 cog set up. After replacing this i can to find my derailleur wasn't up the the challenge of using all three gears (the new middle gear is 2 teeth smaller then the old largest gear). So i'm in the market for a new front derailleur but i don't know what im looking at or where to start. Some research i did is telling me a Shimano 105 but apparently it makes a differnce what your cog setup in the back is and i can only find setups for 9 and 10 speed in the rear and triple fronts when i need a 8 speed rear triple front. does this rear cog suggestion make a difference?