I've been giving some thought to bearing holders lately and I have some
thoughts/questions that perhaps someone can comment on.
It seems that, by far, the most popular type of bearing holder is a two
piece (main cap?) style. This is where the upper part of the bearing
holder is attached to the end of the fork leg and the lower part of the
bearing holder attaches with screws/bolts to the upper part thereby
clamping the bearing in between.
The problem that I see is that if you over-tighten the bearing holder
you run the risk of damaging the bearings. If you under-tighten the
holders then you run the risk of them falling off or at the verly least
having a wobbly wheel.
One way to address this is to press-fit the bearings into a holder and
then figure out how to attach that to the frame. I believe Pashley,
Miyata, and some cheap taiwanese unicycles use this method (with varying
degrees of success).
So, what if you combine both? A split holder with a lip on the inner
and outer edges that when tightened completely (the bottom comes into
contact with the top) holds the bearing just right. With this type of
holder you would not need to worry about over-tightening since any
additional tightening would not put more pressure on the bearing. It
would simply put pressure on the threads of the screws. It would make
the process of much simpler since you would not need to use a subjective
measurement of what is "tight enough". And, because you could securely
tighten the screws you would not need to worry that they might come
loose while riding.
I also have a question regarding the bearing holders on the KH series
(and Summit) frames. They are nearly twice as wide as is necessary to
encompass a bearing. Nearly half of the width is not in contact with
the bearing. And, the bearing is not centered in the holder (it sits
slightly to the inside). So, the questions is: Why not have the
bearing holder narrower? An why put the bearing off-center? When I
tighten the bearing holders on both the Summit and KH24 I find they have
a tendency to pull the lower part to the outsite since there is nothing
there to hold the top and bottom apart.
I'm interested to know if anyone has build a bearing holder (or frame
that uses them) that addresses the above mentioned objections?
mgrant - Ever hoping for the best!
The sun is the same in a relative way but you're older, shorter of
breath, and one day closer to death.
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