(Pete Cresswell) wrote:
> Per Dan Burkhart:
> >Just wondering if anyone else here has built them 3 cross and how
they
> >held up over time.
>
> Haven't tried 3x, but how much do you weigh?
>
> I'm about 220# and have toasted 3 517's laced 2x on the rear....so
now I use
> something stronger in the rear.
At 350+ pounds, I felt that I needed something stronger than *any*
32-spoke wheel. (Rohloff claim that their hub makes a wheel that is as
strong as a 48-spoke rear wheel because it is dishless. I don't know
what measure of wheel strength they use to justify that claim. I
wanted 48 spokes anyway.)
So I set about adding some extra holes to the hub shell-- 8 extra on
the left and 16 extra on the right-- and laced up a 48-spoke wheel in a
crow's foot pattern:
http://img140.exs.cx/img140/328/bohmdriv6fo.jpg
That's 32 cross-2 spokes plus 16 radial ones, attached to a 750g Snow
Cat rim.
I used a 2.5 axis CNC mill to drill the hole pattern. I made a special
fixture plate to securely hold the opposite flange without marring it.
Thus I did not have to disassemble the hub for the machining operation.
I filled the 8 unused spoke holes with tiny screws, to make it easier
to keep track of the lacing pattern. The spokes worked out to be
unusal sizes-- 240mm and 220mm long-- so I had to have them cut to
order.
Drilling into a hub that expensive was an uneasy operation, but it all
went according to plan. I am confident that my hole pattern is held to
tighter tolerances than the original drilling.
Chalo Colina