Is the frame ruined / repairable?
Probably/probably not worthwhile
Is it normal for a frame to corrode like this based on usage?
Steel will show rust in 24 hours from just having been touched with a human hand. If you have done no preventative maintenance then yes.
Should this be covered under the frame builders "Lifetime Warranty"?
Warranties cover craftsmanship and material defects. This is neither, you just haven't done any rust prevention on a corrosion prone material.
Should I just accept i've got reasonable usage from the frame and let it go?
I suspect so
Warranties cover craftsmanship and material defects. This is neither, you just haven't done any rust prevention on a corrosion prone material
If it's a custom frame from an established brand I'd expect them to be spraying frame saver inside. If it's just a dude making frames then yeah ok.
@PhilDAS started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Probably/probably not worthwhile
Steel will show rust in 24 hours from just having been touched with a human hand. If you have done no preventative maintenance then yes.
Warranties cover craftsmanship and material defects. This is neither, you just haven't done any rust prevention on a corrosion prone material.
I suspect so