Additions to cranks page

John has added quite a bit of text to the cranks page; more about crank length, and an entirely new section on how to check for several kinds of damage; also several illustrations where there were none before.

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Gear calculator updated

The Gear Calculator has been updated with new Shimano, SRAM and Campagnolo cassettes, and the new Shimano Steps 5-speed internal-gear hub for E-bikes. French and German versions of the Calculator have been updated too.

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Revised article on truing wheels

We have a major revision to our article on truing wheels, referring to some new tools and additional techniques. There are several new photos. Enjoy.

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Addition to post about 360-degree video

Thanks to Philip Carlson, our article about 360-degree video now includes a video clip illustrating the nighttime performance of the Garmin VIRB 360 camera. As expected, there is camera-motion blur, but it looks much different from that with a conventional camera.

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Rebuilding freewheels

We have a much expanded description of how to rebuild a freewheel, now a new article and no longer just a paragraph in our main article on freewheels.

Using two chain whips to remove the outer sprocket

Using two chain whips to remove the outer sprocket

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Revisions to Sachs/SRAM Internal-gear hub pages

Every once in a while we go back and review our pages to deal with product changes and link rot. We just did that with all our pages about Sachs and SRAM internal-gear hubs. You will find product manuals here which are hard to find anywhere else. You can start with our main page about these hubs.

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Deinterlacing video

We have many pages about shooting, editing and processing bicycle video. Here’s a new page about deinterlacing. What is that? well, the page will tell you. It can do a lot to improve the quality of older standard-definition video footage, and especially, footage shot with a camera in motion. Deinterlacing cleans up the image and doubles the frame rate for smooth motion. Here is a deinterlaced video running at 60 frames per second. If your Internet connection supports the 60 per second frame rate without skipping frames, this is going to look super-smooth. Click on the title and expand the image for best results.

Shining Sea Path at Ter Heun Road from John Allen on Vimeo.

What is this video about? Two cyclists cross Ter Heun road on the Shining Sea Rail Trail in Falmouth, Massachusetts, USA. The crossing is close to an intersection and has a gate in an attempt to slow cyclists down, and a sign instructing cyclists to walk their bicycles — which may be preferable for a person with poor bicycle handling skills but is slower than riding, and so increases the likelihood of being caught by surprise as the traffic situation changes. More about this intersection is at

The video here is formatted at 60 frames per second. A display which runs at that speed or a multiple will show smooth motion. I’m getting that result when viewing the video on vimeo, though not with the video embedded in thsi page.

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Addition to freewheels page

There’s a new section in our freewheels page showing how freewheels work and what is inside.

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Sheldon’s 75th

Sheldon Brown would have been 75 years old today. We miss him dearly.

Sheldon Brown T-shirts are sold by Harris Cyclery at the store and by mail order.

Proceeds from the sale of these T-shirts will be donated to bicycle charities.

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Videos and articles about Paris-Brest-Paris

Harriet Fell, owner of this site, was one of the first Americans to finish the iconic 1200km Paris-Brest-Paris ride, and was one ammong several people to give talks about PBP at an event run by the Charles River Wheelers bicycle club in February, 2019.

Here is a video of her talk. You may click on the link to YouTube in the video to view it in HD resolution and with closed captions. (We are still looking for someone to clean up the Google translation into French…interested?)

Several other people also spoke at the February event. We have a new page linking to all the videos and to our articles about PBP.

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