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9

According to this link the thermal expansion of aluminum 6061 is 13 micro inches/(inch x °F). A headset has a diameter of 1.125 inches, and circumference of 3.5325 inches. Assuming you change the temperature of the headset from 70°F (room temperature) to 0°F (typical household freezer), you'll change the circumference by 13 x 70 x 3.5325 = 3215.5 micro ...


1

I got the new bearings Thursday evening and once I installed and tightened the headset there was no wobble. I took the bike out on a 130km cycle Friday and the bike was like new, going around corners felt so much better/safer/solid. I didn't feel I had to even reach for the brakes so I must have needed a new headset way before now. The LBS somehow ...


1

I had a similar problem with a recently serviced relatively old trek. When I applied brakes or did a bunny hop, I could feel the handle move around. This may not apply to you since your bike is no where near as old as mine was but this was the problem with mine. The bearings in the tube had worn out significantly and dirt and grime had taken the place of ...



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