What's new at sheldonbrown.com
Sutherland’s planned to cover new internal-gear hubs in the 6th Edition (1996) of its Handbook, but then left them out. In straightening up my office recently, I found the nearly finished draft pages. We have permission, and we’ll be adding them to our Internet republication of Sutherland’s Handbook of Coaster Brakes and Internal-Gear Hubs — including trouble charts and comparative parts lists not to be found elsewhere. First hub is now online: the Shimano 4-speed – John Allen.
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 –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.
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.
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!
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?
We have added new sections on derailer maintenance to the derailer adjustment page, including how to cannibalize rear derailers, being careful about compatibility, and how to check cables, 
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.
A few months ago, a reader prompted us to make some updates to our chainwheel bolt circle cribsheet. But now we have followed up on that effort, greatly expanding our coverage, and we have added a set of templates which allow you quickly to identify the bolt circle of alnost every model of chainring, and the tooth count, without the need to measure or count by hand. It’s all here: https://sheldonbrown.com/cribsheet-bcd.html. Example template is at the right.
If you can correct any inaccurate information or you can identify a chainring that we do not cover, please let us know. We are not too proud to take corrections, and we’ll even credit you on the site for your contribution!
New article about the GoPro Hero5 Session action camera, latest in our series of articles about shooting video from a bicycle. This is a very small and light camera which will not weigh down a helmet and is especially good for use on a drone. It has some advantages and disadvantages worth knowing about.Note: the photo may be larger than life size! The camera is about 1 1/4 inches on a side.
