SheldonBrownBlog

Plotting sprocket pairs and ratios as a two-dimensional graph makes it possible clearly to see which pairs have nearly the same ratio — and to identify good sequences.

We have a graph and an article to describe it.

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Now for the first time, we have created a page that shows and describes the different types of cassette bodies all the way from early Uniglide up through the latest 11- and 12-speed systems. There is far more compatibility than you might expect, and some incompatibility that you might not. See how you might be able to make a 7-speed hub into 10-speed, or vice versa…

We have expanded our coverage of repair of leather saddles — several new photos and paragraphs of text. Also, in case you would rather not repair your saddle yourself, we have updated information on where to send it.

The saddle in the image below was assembled from an Idéale Model 92 top and Model 80 undercarriage. Good as new!

We continue with our postings from the lost pages of the Sutherland’s Handbook for Bicycle Mechanics, 6th Edition — this time, the rebuilding instructions, parts list and troubleshooting chart for the Sachs/SRAM Pentasport 5-speed hub.

It is no wonder that cyclists choose to ride in the comfort, safety and privacy of our own homes. Yes, stationary bicycles are popular. But, if you are going nowhere, how about doing it at a relaxing pace?

ShelBroCo has answers! Read about them here!

Sheldon Brown died on February 4, 2008. It’s hard to believe 14 years have past since then. This is a picture of Sheldon at a younger age.

That isn’t a mouse under his front tire. Selfie pioneer — he tripped the shutter of his camera with an air bulb.

The SRAM DualDrive hub was the mainstay hub for hybrid gearing for 15 years, from 2000 through 2015. Very many are still in use. Read here about how to install, adjust and adapt its unusual shifting parts.

Our page on ways to measure bicycle components can save time and avoid the need for  some expensive tools. We have now added information on how to compare chains. And the example in the photo here:  How to determine  the length of a cable without uncoiling it.