When OpenAI lets you down, ShelBroCo can save the day.
ShelBroCo and OpenAI
Tag: Sheldon Brown
Remembering Sheldon
Sheldon Brown would have been 77 years old today. We miss him very much.
In this picture his big brother Richard is reading to him. And at the right is the cover of the book Richard was reading.
“Run, run
As fast as you can,
You can’t catch me,
I’m the gingerbread man.”
Cable installation
John added photos and a quite a lot of additional information to our page about cables, and the page got too long — so we have split it into two pages. The original cables page now includes more background information — why use cables, the different types, and a video showing how they work. The cable installation page has many new photos, added details, and tricks and tips.
First cyclecomputer?
Our cyclecomputer database goes deep. We have found, scanned and posted a PDF of the manual for what is probably the first cyclecomputer, the Veltec Pacer 2000. We also have manuals for early Cateye, Avocet and Vetta computers, and rare brands.
Podcasts!
Podcasts –we now have a link to Harriet Fell’s and John Allen’s interview by Diane Jenks for her Outspoken Cyclist podcast — and links to other podcasts and videos as well. Find them on our podcasts page.
We are here!
Ah, the hand-wringing. It seems to have started with someone at the road.cc blog who inquired on our Facebook page, then posted on without waiting for our response.
Harris Cyclery has closed after a 70-year run, hit hard by pandemic supply issues. Sheldonbrown.com got its start when Sheldon worked at Harris Cyclery, and we are very grateful to Harris Cyclery for its support. But, since 2010, sheldonbrown.com (except for the /harris pages) has floated its own boat, through online advertising.
We don’t know yet what other affiliation we may find, or whether we’ll go it alone, but you may rest easy. Ride your bike, and feel free to come to us for help keeping it in top shape.
On-Road Repairs update
We have added to our page about on-road repairs. There is now a quick list so you can check which particular tools you might need for your bicycle, and we have covered some additional tools.
The basic on-road repairs will get you home or to the next bike shop on your bike, almost every time. If you can’t find the time or inspiration to learn them yourself, you might ride with someone who did!
ShelBroCo Quadratech
Introducing ShelBroCo QuadraTech Chainrings and sleeve nuts.
Throw away those obsolete chainrings! The unbearably vexing problem of sleeve-nut rotation has bedeviled generations of bicycle mechanics. Who else would you expect to come up with a solution but ShelBroCo?
Modeling bicycle dynamics
We publish another paper by Osman Isvan. He uses a simplified model with only 3 degrees of freedom and simulates system frequency response under steady-state and transient conditions. He investigates the effects on vibration isolation of several key parameters including tire pressure, frame compliance and riding position. The graph below from his paper, one of several, shows results when tire pressure is changed.
Osman Isvan on Hills, Winds — and Data
Osman Isvan takes a deeper look into hills and winds.
- Do you (or should you) work harder when climbing a hill?
- How hard do you (or should you) work on a given hill? Does it depend on your gearing? The slope of the hill? What are all the relevant factors?
- Do you (or should you) work harder against an uphill slope than you would work against a headwind? Why?
