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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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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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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ntappin

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


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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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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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