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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