any thunder riders here grinded down to the axle? mine are starting to get some (albeit shallow) grooves, i was wondering what the timeframe is for it to happen.
If you are skating normally, not crusty raw concrete curbs or pool coping, Thunders usually last a good while, but as they are a thinner metal on the hanger than some other trucks, they don't last as long on the crusty stuff and can be eaten to axle in a week on really raw grinds, but that was more just seeing how quick they could go through them.
I still have some from years ago that people skated to axle then took off and they still skate fine, although the flat grinded surface is more a pain than the newer thinner fresh truck feel.
So overall, from a week to many years, going both opposites of the scale. Most of the guys I know go through trucks within a year, or at least swap them out when they start to feel too worn down, often about 3 to 6 months minimum really.