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Read if you have Rollo Disks



 
 
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  #1  
Old December 4th 08, 10:01 PM posted to rec.sport.unicycling
danger_uni
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Default Read if you have Rollo Disks


Hi All,

There are a couple of issues I'm currently having to sort out with the
Rollo disks.
Issue #1: Standard Moment axle bolts appear to be too short to have
sufficient thread depth on installation of the production disks.
Issue #2: The disks may have been manufactured in two pieces with a
disk pressed into the hole in the middle. They were supposed to be
machined in one piece.

For those of you that have already received one, it would be
appreciated if you could hang tight for a few days while I try to sort
this out. Don't install them as tightening the axle bolt with too few
threads may damage your hub.

Thanks for your patience and sorry about the hassle.

Kris


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  #2  
Old December 4th 08, 10:20 PM posted to rec.sport.unicycling
danger_uni
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Default Read if you have Rollo Disks


OK- it looks like the 2nd issue was a false alarm. That's a relief.

However, it looks like there has been one posted disk where the middle
was broken by severely tightening the axle bolt. This would take a huge
amount of twisting force on that section. I am a bit baffled about how
it could occur as the inset shouldn't be under that much force.

Note that in general there isn't the same need to tighten axle bolts
ultra tight as there is with 4-square-taper cranks.

Again though- don't install until I've sorted out the issue of getting
longer axle bolts.

Kris


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  #3  
Old December 5th 08, 12:45 AM posted to rec.sport.unicycling
ntappin
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Default Read if you have Rollo Disks


The KH Ti hubs have bolts long enough for them. It is possible that the
08/09 hubs are long enough as well, but I will wait until Kris agrees
before I say that definitely.


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  #4  
Old December 5th 08, 12:52 AM posted to rec.sport.unicycling
surfer1024
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Default Read if you have Rollo Disks


the bolts that came with my 08 kh longneck (not ti hub), aren't long
enough.


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  #5  
Old December 5th 08, 01:31 AM posted to rec.sport.unicycling
danger_uni
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Default Read if you have Rollo Disks


There are very slight manufacturing tolerance variations when making
ISIS splines. As long as you are within the ISIS-defined standard,
that's completely normal. Because ISIS splines are tapered, the result
is that some cranks go on very slightly further than others. It's
possible that those of you that have ones that fit simply have cranks
that fit slightly further onto the splines.

But again- if it looks like you are just catching 1 or 2 threads, you
shouldn't try tightening the axle bolt because you run the risk of
stripping the hub threads.

There is a small gap between the back face of the Rollo disk and the
end of the axle, because the cranks never 100% completely go all the
way onto the axle. Because of this gap, it appears that if you work hard
enough at it you can tighen the axle bolt so much that it breaks the
back face of the disk.

However, this much pressure is not needed to keep your cranks secure.
As long as you just tighten the axle bolt to firm hand pressure, that's
enough. For those people accustomed to the old 4-square-taper hubs,
this is way less pressure than was needed with those hubs.

Kris


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  #6  
Old December 10th 08, 12:28 AM posted to rec.sport.unicycling
danger_uni
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Default Read if you have Rollo Disks


Hi All,

Extra-long axle bolts have been ordered in Taiwan at 25 mm length (the
current axle bolts are 18 mm).

As soon as their made, I'll air-ship bolts to all the importers who
currently have Rollo disks; they can send them on to everyone who
already bought them and are waiting on the bolts. That should take
about a month.

Starting next Spring, all Nimbus and KH ISIS hubs will come standard
with the longer bolts so will all be compatible with the Rollo disks.

Thanks for your patience!

Kris


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  #7  
Old December 10th 08, 12:53 AM posted to rec.sport.unicycling
surfer1024
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Default Read if you have Rollo Disks


danger_uni;1146633 wrote:
Hi All,

Extra-long axle bolts have been ordered in Taiwan at 25 mm length (the
current axle bolts are 18 mm).

As soon as their made, I'll air-ship bolts to all the importers who
currently have Rollo disks; they can send them on to everyone who
already bought them and are waiting on the bolts. That should take
about a month.

Starting next Spring, all Nimbus and KH ISIS hubs will come standard
with the longer bolts so will all be compatible with the Rollo disks.

Thanks for your patience!

Kris



Yay!


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  #8  
Old December 10th 08, 02:47 AM posted to rec.sport.unicycling
OneWheelLess
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Default Read if you have Rollo Disks


One question-
If over-tightening the crank bolts can shear the thin inner section of
the disk, how will this design be affected by the stresses of normal
use?
It seems that any weight that the rider places on the rollo disk is
transfered through that thin material. Also, since the center of the
rollo disk will not contact the end of the axel (in most cases), that
weak spot also bears the force needed to keep the crank snugly fastened
to the hub. It seems that even if the force does not immediately shear
the disk there may be enough force to stress the aluminum and result in
a less sudden premature failure.
If I am correct, this could be prevented by thickening the material
slightly, or by providing spacers to fill the gap between the inside
face of the disc, and the end of the axel.
Could this be a valid concern?


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  #9  
Old December 10th 08, 05:16 AM posted to rec.sport.unicycling
danger_uni
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Default Read if you have Rollo Disks


The shelf that the bolt face sits on is not actually that thin at about
4.5 mm - enough that it should be more than strong enough for the
appropriate axle bolt torque. The disk contains an insert section that
slides into the crank to support lateral force when standing on it;
again lots of metal for flat riding.

If you keep the Rollo disk on the cranks and hit it hard during a big
grind, you could break it. It's in a pretty vulnerable place. But
of course, the point of the disk is to take cranks that are good street
and trials cranks and turn them into good flatland cranks. If you are
going to try something that might really smash it, just take it off.


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  #10  
Old December 12th 08, 08:10 AM posted to rec.sport.unicycling
Probailer2
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Default Read if you have Rollo Disks


danger_uni;1146742 wrote:
If you keep the Rollo disk on the cranks and hit it hard during a big
grind, you could break it. It's in a pretty vulnerable place. But
of course, the point of the disk is to take cranks that are good street
and trials cranks and turn them into good flatland cranks. If you are
going to try something that might really smash it, just take it off.




With all respect, I don't think people will take the rollo disk off
when they will do a grind or stall etc. To much hassle. So expect some
breaks after a few months.


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