Report "Knocking noise A deep, loud knocking noise is heard with every rotation of the pedals. I'm not sure if I'm describing this right, but you'll hear the knocking noise with only one foot's worth of rotation--not with both. I'm not sure whether the knock is emanating from the left or right or if that's irrelevant--given the parts under that rear housing. But it never goes away during a 30-40 minute session. The elliptical was a "brand new" floor model--"little wear" only "minor surface scratches". Seems to ride just fine. But that knock will drive you crazy!"