Freewheel wobble is caused by misaligned threads on the wheel, as BikemanforU shows in this tutorial. Free shipping http://www.bikemanforu on bike parts, tires, tools, and cycle accessories. The irregular motion, which can be severe in some bicycles, starts inside the factory that manufactured the hub used in the bicycle wheel. Poorly machined hubs result in misaligned threads, which means the freewheel can't thread evenly onto the hub. Unbalanced rotation is the result. Since cassettes use a splined freehub with external ratchet system, they don't have this threading issue. Learn the difference in wheel hubs that accept a freewheel and the freehub that works for a cassette - and find out why cassettes don't have this problem. YouTube's award-winning guru of bicycle repair and maintenance delivers a close-up look at two examples of the issue - starting with a wobble so extreme it pulsates the crank and pedals. We also get a look at a tacoed wheel and how to get the freewheel off using special a special tool and a vise. Learn the art of self reliance with the BikemanforU channel Subscribing's free for new videos plus the bike shop LIVE Show.    / bikemanfooru   Social media - google + http://bit.ly/1eJU6fR @bikemanforu Like   / bikemanforu   and   / bikemanforu   Join tech happy hour #bikemanforu Fridays at 5:15 pm eastern http://www.younow.com