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High speed vibration on main gear

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Polar

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Hey everyone,

I recently replaced my landing gear with the heavier, taller, Grove gear. On the initial flights it appears to have a fairly pronounced vibration on takeoff and landing. I aligned the wheels as per the manuals, and it tracks straight as an arrow. Other than vibration it lands nicely. I didn't do anything to the brakes or wheels. The gear and the mounting bolts (and the vibration) are the only thing that's new.

It only happens on the ground, it's briefly noticeable at the end of the takeoff roll, and immediately upon touching down. So it worsens with speed and isn't noticeable below roughly 60mph. An A&P friend flew it and said it felt like a wheel out of balance, but I didn't change anything on the wheels.

Any ideas?? 🤔
 

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