i just got an LX m581 front derailleur. i know it is an older model and 9 spd compatible. would it be wrong if i run it with a 10 spd in the back? will i encounter any difficulties when ill tune it? i mostly use the large and the middle ring in front... rarely, when i do climbs i use the small one. also at the back, i keep it in the middle most of the time. any opinions?