Pilgrim said:
So, I turn to the gear heads. How would you build a bike that was
capable of carrying an adult passenger? Obviously strong wheels are
necessary.
Yep. I recommend a 48 spoke rear wheel, dishless if possible.
Quoted message said:Also you'd need a beefy rack. Does anyone make one with a
200lbs or greater weight limit?
No. I would make my own if I wanted to carry a passenger. The
closest thing I've seen to suitable is the Burley Moose Rack, but like
most things made by Burley, I think it's no longer in production. At
200 lbs. payload, I think the dropout eyelets and 5mm fasteners used
to anchor most rack stays would become as much of an issue as the
rack's construction. I'd be inclined to braze or weld on some good-
sized nuts (like 8mm) to carry the load. Or just weld the rack
directly to the frame.
Quoted message said:Would you make them sit side saddle,
or straddling the rack. Forward facing or rear? Where could they hold
on? Where could they put their feet? I've seen kids riding around on
each other's foot pegs. Could BMX foot pegs attached to the rear axle
work? Could you even attach a full second seat?
Footpegs are a good idea IF you use a BMX hub with a 14mm axle, and a
frame with substantial stays and dropouts-- the Redline Monocog comes
to mind on that count. The axle of a loose-ball 14mm axle hub can be
slewed over to the drive side for the purpose of adding spacers and
mounting a multi-speed freewheel. The spacer and locknut would have
to be ground, turned, or otherwise reduced in diameter to no more than
19mm (to fit through a freewheel), and you'd probably have to get an
axle with milled flats to fit a 3/8" dropout slot.
To skip all that complication, you could use motorcycle "highway pegs"
mounted to the chainstays just ahead of the dropouts or perhaps
appendages on the rack itself. But using a hub with a reinforced
axle, like the Gusset Jury hub, is still a good idea to prevent axle
bending or breakage. Unlike the rear wheel of a tandem which mostly
just carries the weight of the stoker, the rear wheel of the bike you
have in mind will be called upon to carry most of the weight of both
riders.
You can use a tandem stoker stem and cut=down MTB bar to give your
passenger a good way to hold on. a regular bike seat isn't the right
shape for a spraddle-legged backseat rider, but a motorcycle "pillion
pad" is just right. Take note; they range in price from about $30 to
over $300, with the latter pricing designed to fleece Harley-riding
and wannabee-Harley-riding morons.
http://www.royalenfieldusa.com/deluxe-standard-pillion-matches-deluxe-standard-solo-seat-p-424.html
http://search.ebay.com/pillion-pad_W0QQ_trksidZm37QQfromZR40
For all the trouble you'd go to in the attempt to make a single bike
work for two, you might find it easier to use an Xtracycle Free
Radical attachment for your bike, which offers handy options like seat
cushions and footboards.
http://www.rideyourbike.com/xtracycle.html
Chalo