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Author Archives: jsallen
Safe separation with the Copenhagen curb?
How does a Copenhagen cycle track make bicycling safer? By putting bicyclists behind a low curb, a curb which a motor vehicle with its big tires can mount, but a bicycle can’t. The curb increases safety for bicyclists the way … Continue reading
Posted in Bicycle facilities, Bicycling, Cycle tracks, Sidepaths
Tagged bicycle, Copenhagen, curb, cycle tracks, pedestrians
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Streetcars and bicycles
The rails for the E line branch of the Green Line subway/streetcar in Boston, Massachusetts, USA occupied the middle of two-lane Centre Street for over 20 years after service was discontinued. There had been a proposal to redo the street … Continue reading
Posted in Bicycle facilities, Bicycling, Bike lanes
Tagged Bicycling, Copenhagen, Oregon, Portland, streetcar, streetcars, tracks, tram
1 Comment
Copenhagen in 1937 — what can it tell us?
I thank Ralph Fertig of the Santa Barbara, California Bicycle Coalition for drawing the attention of the bicycling community to the following fascinating travelogue from Copenhagen, shot in Technicolor in 1937. Not all of the film is about bicycling, but … Continue reading
Posted in Bicycling, Cycle tracks, traffic circles
Tagged bicycle, Bicycling, bikeway, Copenhagen, cycle track, Denmark, Europe, vehicular, Vikings
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Drive ratios of bicycle hub gears
My examination of drive ratios of the SRAM S7 hub has led to examination of other hub gears. I now have information on a very large number of hubs posted online in a Web version of a Microsoft Excel workbook … Continue reading
Posted in Bicycling, Equipment, gearing
Tagged bicycle, gearing, internal hub gear, ratios, Rohloff, Shimano, Spectro, SRAM, Sturmey-Archer
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Very old Sturmey-Archer hub – made in USA?
I hold in my hand a piece of history. Some fortunate cyclist rode the hub shown below nearly a century ago. It turned up in the basement bike parts stash of my good friend, the late Sheldon Brown. These hubs … Continue reading
Corrected: SRAM S7 gear ratios are as claimed!
Probably only a few people saw the earlier version of this post, but in any case I take it back. I thank Alex Wetmore for correcting my error. The 17-tooth planet gear of the SRAM S7 hub, not the 12-tooth, … Continue reading
Gridlock Sam’s magic powers!
New York’s former Traffic Commissioner and Chief Traffic Engineer, Sam Schwartz, “Gridlock Sam,” who describes himself as a “traffic guru”, has posted a Web page [updated and expanded since my original posting, apparently deleted sometime after October, 2014 but available … Continue reading
Review of The Birth of Dirt
Review of The Birth of Dirt By Frank J. Berto I’ve just read Frank Berto’s book The Birth of Dirt (second edition), about the origins of the mountain bike. It’s a quick, fun read, and offers quite a thorough review … Continue reading
Posted in Bicycling, Books, Reviews
Tagged Berto, Frank Berto, Marin, Mountain Bike, MTB, Repack, Tamalpais
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Lessons from Taiwan
In the summer of 2002, I had the privilege of visiting Taiwan, by then a dynamic, modern industrialized country. Cars and trucks were in wide use, and there was frequent bus service in urban areas, but motor scooters were the … Continue reading
Posted in Bicycle facilities, Bicycling
Tagged bicycle, law, motor scooter, Taiwan, traffic
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