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gbj_tester
@TRA
I'm dredging, but would like some confirmation of my suspicions.
Built up a beater for a friend. Frame and forks look straight, wheels sit straight in the frame.
Headset is not perfect but i've used worse. 1" threaded. Alignment was confirmed with the Park alignment tool.
Bike has a weird gyroscopic steering feel. i.e. it likes to wander and wants to pull left or right - feels exactly like trying to turn a spinning wheel off balance when you're holding the axles.
There's no play in the steering and no binding of the headset. The lower race is flush against the fork crown seat.
The problem made the bike nearly unrideable when i had a 60mm stem and risers on, I switched to a 100mm stem and it's better, but still there in the background.
I suspect the fork steerer is not dead straight or the crown race is actually warped.
Also I think the geo of the frame is quite steep at the front potentially making it twitchy?