April 9th 2003
MnHPVA Meeting
Meeting Report: Tim Dunsworth
Photos& HTML: Mark Stonich
Show-N-Tell
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The parking lot highlight was two Twikes (one pedal-electric and one all electric) brought by Carl Gulbronson. Eventually we did move inside and start the meeting by about 7:30. Show and tell items were a little thin on the ground this month, but lasted us until about 8:30

Paul's Homebuilt Handcycle
Trail news:
* The Cedar Lake Trail may soon be closed while the old Cedar Lake Road wooden bridge is replaced.
* The Gateway Trail is closed where it crosses hiway 61 for a while.
* Nobody had any hard news about the work schedule for extending the Greenway farther east. This season, or ??. Ditto for the downtown end of the Cedar Lake Trail.

Dave Gray's QR Pedals
Carl and Jim Black told us about the Living Green Expo scheduled for the coming weekend of the 12th and 13th at the state fairgrounds. It is in the Education building (near the main Snelling Ave entrance) and the hours are 10 to 6 on Saturday and 11 to 6 on Sunday. Admission is free. For more info see www.livinggreenexpo.org on the web. The street in front of the building will be blocked off for demos of hybrid cars, electric scooters, Twikes, Quadribents, etc.

Lance Oberg's Seat Strut Clamp
Nick Demma showed the latest iteration of his big white fabric streetliner. It has a stiffer frame (using mahogany and cedar strips) so the fabric can be stretched tighter, and the nose shape has been tweaked a bit. He had .030 lexan windshield panels on the ride after the Hoigaards slide show, but since then he changed to .060 to reduce the noise the thin stuff makes. Another change since then is a clear panel on the nose for his headlight to shine through. The lights are now microprocessor controlled with steady, turning, braking, and hazard modes available from handlebar switches. The system now includes over 60 LED?s, with 20 in each of the turn indicator clusters alone!

Jeff Caswell's Phil Wood Hubs
John Evingson showed his ultra-fat tire Iditabike again, for those who hadn't seen it a few meetings ago or at the ice races. The rims are 80 mm wide (!), made in a small run of 100 by a Mexican company (that has probably gone under since then) and intended mainly for sand riding. They weighed three pounds before he drilled them out extensively. The front tire is a "normal" downhill mountain bike tire forced to a flatter shape by the wide rim, but the back tire is a custom wide tire made for sand and the Iditabike race. It has very pronounced chevron-shaped tread bars that cause a lot of buzzing on a smooth surface but work very well on snow and sand. He usually uses one large tube per tire, but can use two narrower tubes side by side to get an even flatter profile. He runs the tire pressures at 4 to 20 psi! That sounds extremely low, but the large volume of the tires makes it about right, and in fact 20 psi feels on the firm side. Mark says a 1.75" x 26" tire can roll quite well on as little as 45 psi.

John made the frame from stainless steel tubing in a run of five for the Iditabike, and this one is the last of the five. Despite the wide forks and rear triangle the frame only weighs about four pounds and the fork two pounds. The whole bike runs about 30 pounds, and in the Iditabike he packs on only about 15 - 20 pounds of food and light-weight camping gear, mostly on the front rack (the small rear rack takes a custom bag for light and bulky clothing layers). The frame was deliberately built on the light side so it would flex and give a cushy ride at slow speeds. The cranks are from Caramba, with large arms that are drilled out with two lengthwise holes to make a fairly light and stiff crank.


Mark Stonich's Dummy Headset Spacers

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