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I ride my bike on and off road in all sorts of conditions and whilst I've spent time using Dinitrol to protect the inside of my steel frame, I've done nothing with the inside of my steerer tube (perhaps naively believing that aluminium doesn't corrode, which I'm sure isn't the case).
It occurred to me today that the lower portion of my steer tube picks up all sorts of muck and road salt; should I be doing anything to protect against this (a simple bung would probably do the trick)?
That said my crankset is possibly 15 years old and on its third or fourth frame, has been covered in all sorts of muck and seems fine.
Yes, I have some perfect oil for that, apply twice daily
Okay, so that's a yes then. Maybe some grease inside the steerer tube and a bung would do the trick (Dinitol stays slightly fluid and I wouldn't want this or GT85 seeping out onto the carbon legs).
I've never bothered using anything since the early 90's. It's not an airplane.
Put some grease on it if you like I suppose but don't use a bung.
That will just keep water in if<span style="font-size: 0.8rem;">Â any gets down from the top of the steerer. Unless you remove it every time you clean the bike.</span>
1 fairly isolated example there of the fork snapping in Perth Western Australia where it's nearly always dry and has no salt corrosion.... unless it's eating through it's not an issue at all.
Grease or Boeshield
or oil would be enough. A bung would just trap moisture, and cause problems.