I got my 09 Allez about 3 months and put about 500 or so miles on it. Lately when ive been shifting down to my 19T and 17T it begins to click then eventually the chain jumps or it misses a tooth or something, cause my pedal to jerk foward. If I shift back up and then back down it usually doesnt skip again. Im not sure were to even start looking to fix this problem. I tried a search but I really down know what I should be exactly looking to fix.
The bike has Sora and Tiaga components