Matt O'Toole said:On Mon, 12 Dec 2005 19:08:26 -0800, Joel wrote:
Quoted message said:Nonsense. Even the cheapest hubs last practically forever if you keep
them clean and greased. And even Tiagra hubs are better sealed these days
than Ultegra and Dura Ace used to be.
I'm curious about the seals on cup-cone hubs. Do they really make much
difference? What sort of service intervals can a person expect?
I've been riding on wheels that have the Shimano 2200 hubs (below Sora
level). These have nothing that could be called a seal... no rubber, no
labrinth... just a gap between the shield and the cone. After I
initially packed the bearings with marine grease, I decided to stick
some rubber grommets over the cones, to hopefully make the bearings
less exposed to the environment.
They lasted about 5,000 miles, including a fair amount of rainy riding,
before I noticed a clicking sound coming from the hubs whenever I'd
spin the wheels. At first I thought they must have been full of grit,
but now I wonder if it wasn't just the bearings clicking whenever they
reached an unpre-loaded point in the cycle... I generally adjust them
so that there is a tiny bit of play at some point in their rotation
(installed). The grease inside was thinner and darker than when I
packed them, but it really didn't look bad.
I'm wondering whether the grommets really help, or if the marine grease
would do a fair job of sealing that opening by itself. I also wonder if
the "sealed mechanisms" on the higher end hubs do much of anything. Any
thoughts or experiences? It'd be nice to be able to do 10,000 or 20,000
miles without touching the hubs...