Its coming in the mail..Ive heard that I'll need a 1mm spacer?? Thats if I'm using the Shimano freewheel which I'm planning on getting (20 t). Heard the ACS is way noisy & I cant afford the White INd. Where can I get one that small? They come in 1 mm?? I am a noob...but I love my bike & my unborn bike.