it came with the bike, so i wouldnt know. Besides i am a noob to biking, i just dont like it when i am going up the hill, chain slips and i almost eat it, happend to me twice today on the same hill. Another thing, i hear a metal contact sound as i pedal, i dont know if that helps.

However, that might be the bedals because when i am not pedling and going down hill the odd metal contact sound is heard,