It's because they sit.
Tires need flexing in order to live. It's the flexing action that brings up
the oils and such from inside the tire that keep it alive. Without that
flexing, a tire will much more rapidly check and crack on the sidewalls. No
kidding, I'm not making this up, it comes from the tire industry. This is
why those tires you've had on a car you drove go to heck in a handbasket
when you park the car for a few months.
Bearings in a car get rotated and heated up by use quite frequently. This
drives out moisture and circulates the grease over the metal surfaces.
Trailer bearings just sit there, undisturbed and cold. So the condensation
that does get into them doesn't get driven out. And as the water patiently
works through the grease, it starts to rust the metal. Wet rusty bearings
don't work well, even if they have good brand names like Timkin.
----- Original Message -----
From: "Doug Braun" <doug@dougbraun.com>
To: "Ron Schmittou" <rs1121@earthlink.net>; <shop-talk@autox.team.net>
Sent: Thursday, October 11, 2007 12:29 AM
Subject: Re: [Shop-talk] trailer advice needed
> So generally speaking, why are trailer tires and wheel
> bearings so lousy?
> I always hear about them failing. And it sounds like
> it is a much more dangerous problem on a trailer
> compared to a car.
>
> Those parts never give me much trouble on my car...
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