Originally Posted by
Piff
As I understand it, this can also be a recipe for speed wobbles.
the causes can be from any number of sources.
anecdotal experience- I have one bike owned for nearly 5 decades, only speed wobbled once- rebuilt the front wheel with fresh rim and spokes, a training wheel I built from a used rim and Used! Spokes had 30 years on it.
I will blame the wheels.
I have 4 bikes that on a straight downhill stretch won’t wobble when riding “no hands” the vast majority do, very hard to nail down.
‘Severe speed wobble will really impact the confidence in a bike.
the three times I have experienced it, the incidents were started by an unanticipated lateral impact bump.
the worst barreling down Beverly Glen - went from sunny to shade fast and encountered a poor asphalt repair in shadow before my eyes adjusted. Wild ride and not in a good way.
shifting weight back, knee against the vibrating top tube and rear brake only was the way to control.
oh yeah, three of the four no hands stable on a straight descent? French bikes. A vote for 26mm top tube and 28mm down and seat tube?