Would have saved you a pile of money if you had just changed the rear cassette to have an 11 tooth..ie up from 87 gear inches to 94 gear inches..but with the 56 teeth chainwheel you now have a top gear of 101 gear inches...Seems a lot of money to spend just so you can pedal downhill more quickly..to gain momentum to climb up the next hill...Why not just relax ..slow down and enjoy the scenery..You have a 20 inch wheeled folding bike for goodness sake..not a carbon fibre road bike..!