What could be wrong with my bike?

[Nina]

When riding my bike, lately the whole bike is shaking like crazy. I can hardly let go one of my hands off the handlebar. Both wheels seem round and not buckled. They are not loose either, at least I can

[Martine]

Hi Mary,
If everything is tight and the wheels are round. The runout should be checked. That is turn the bike upside down and spin the wheels. See if they are spinning in the same plane. If they are then the only other possibility would be a broken frame. If that

[Nina]

Hi Mary,
Richards advice shows an adequate analysis, probably the frame, small chance of the fork holding the front wheel.
Strickly spoken I am not in favour of welding irrespective of the type of frame.
Steel bike frames with lugs are soldered: using a silver/metal alloy, at temperatures of around 1000 degrees. Welding on this type of frames can cause a circle around the weld that is brittle and, due to the dynamic forces on the frame, is the next spot where the frame brakes again.
(Due to the higher temperature when welding, the carbon in the steel migrates and concentrates in a specific temperature zone, causing the brittleness)
DeBewerker

[Martine]

Thanks debewerker for the expanded analysis. Mostly if she has a frame problem and the bike is so hard to control she shouldn

[thill]

Hi,

Sounds like the steering bearings to me. If you put the front brake on and then roll the bike forwards and backwards can you feel any looseness in the steering head? if so try tightening the bearings a little.

Good luck.