KH frame bearing holder problem/question

[brycer1968]

I've got a new set up I've built up with a KH 36 frame and Nimbus ISIS
normal width hub that is causing me some grief. Thought that someone
might have some thoughts or expereince with this issue:

The KH bearing holders don't seem to completely eliminate movement
between the outer bearing race and the frame's bearing holders. It
shows in the form of more side to side wobble at the tire than I'd
expect, enough to make rubbing on the Maggie brake pads an issue when
idling (even with the brakes adjusted out where they barely make contact
with the wheel).
When I push the tire/wheel side to side in the frame, and watch and
feel closely what is going on at the hub, I can see and feel the bearing
moving with in the holder and the crank arms move slightly side to side
too with the side to side pushing too.

Other data:
1. I've built a relatively high tension 4 cross wheel (with 14 ga ss
spokes, Semcycle XL nipples, second generation airfoil rim, both spoke
head and nipple washers) So the lateral play at the rim is (or should
be) very small.

2. The side to side play seems to be there regardless of how tight the
bearing caps are although I notice the movement somewhat less when the
bearing caps are tightened down tight enough to keep the wheel from
rotating freely (It appears to be compressing the outer bearing race a
bit)

3. The bearing holders appear to fit the bearing well and the caps
even take some persuasion to come off the bearing when I remove the
wheel.

If you guys can't set me straight on this, next I was gonna use some
plasti-guage http://www.plastigauge.co.uk/how.html to measure the
assembled clearances or use an imporvised transfer dye (think carbon
paper) to see where the bearing contacts (or doesn't contact) the
bearing holders. My other thought was: the backlash/slop in the
cheaper bearings on this hub might magnified with a wheel this large?

Any thoughts? Anyone else had this problem?
Thanks,
Brycer1968


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[1-wheeled-grape]

My guess is that the bearing are 40mm, and the holders are 42mm, or
something along those lines. You could make a shim out of a drinks can
or rubber like the ones supplied with Koxx unis.


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[kington99]

1-wheeled-grape;1122391 wrote:
> My guess is that the bearing are 40mm, and the holders are 42mm, or
> something along those lines. You could make a shim out of a drinks can
> or rubber like the ones supplied with Koxx unis.



alas this isn't the issue, as no-one makes 40mm bearings for ISIS hubs


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[1-wheeled-grape]

Oh right, I didn't know that. In that case I have no idea!


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you wasted your time didn't you? :rolleyes:
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[Jerrick]

Do you have all the spacers on?


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[brycer1968]

Jerrick;1122449 wrote:
> Do you have all the spacers on?




Yup, one on each side.


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[saskatchewanian]

This seems odd, are you sure that it is the bearing slipping in the
housing and not the bearing slipping on the axle? If it is the bearing
slipping in the housing you could try jamming something between the
bearing and either the inner or outer lip of the casing, If it is
slipping on the axle you could add more spacers.


I never really understood having spacers for an ISIS setup as it is a
tapered spline. Unless everything has perfect tolerances they would
either prevent the cranks from going on all the way or leave room for
the bearing to slide anyway.


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[TonyMelton]

You could try putting another ISIS wheelset in the frame and seeing
whether the problem is still there. Then you'll know whether its the
frame or the bearings which is causing the problem.


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[brycer1968]

TonyMelton;1122957 wrote:
> You could try putting another ISIS wheelset in the frame and seeing
> whether the problem is still there. Then you'll know whether its the
> frame or the bearings which is causing the problem.



Yes, will try that tonight Tony. I did ride this on a 100k this
weekend and the flex seems to be less annoying than I originally
thought. I adjusted the Magura brake to accomodate idiling, with
greater clearance on the side I usually idle on - and I'm feeling much
better about it.

I'm wondering if anyone has had issues with Maggie brakes rubbing with
this hub/wheel/frame set-up and what solutions you found?


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[corbin]

brycer1968;1124490 wrote:
> Yes, will try that tonight Tony. I did ride this on a 100k this weekend
> and the flex seems to be less annoying than I originally thought. I
> adjusted the Magura brake to accomodate idiling, with greater clearance
> on the side I usually idle on - and I'm feeling much better about it.
>
> I'm wondering if anyone has had issues with Maggie brakes rubbing with
> this hub/wheel/frame set-up and what solutions you found?



My solution was to use a cable brake instead.

corbin


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