Author Archives: John

Additions to the Gear Calculator

New crank lengths have been added to the Gear Calculator and Internal Gear Calculator, so they can calculate gain ratios for children’s bicycles with cranks down to 100 mm (less than 4 inches).

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More hubs in cable-pull cribsheet

Added information on four hubs to the internal-gear hub cable pull cribsheet: Shimano Alfine 11-speed SRAM G9 Sturmey-Archer S3X Sturmey-Archer ASC Thanks to Jeff Meredith and Michael Wilson for the measurements!

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Measuring tricks

We have a new article on how to perform the precise measurements needed to determine whether bicycle parts fit each other, without expensive and fragile tools. There are a number of clever tricks — for example, you can test the … Continue reading

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Reorganization of headset tables

Our tables of headset sizes have been reorganized to make it easier to determine which headset can be made to fit which frame and fork. Fork crown race seats can be milled down and head tube race seats can be … Continue reading

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Shimano 4-speed hub gears

Expanded coverage of Shimano Nexus 4-speed hub gears — we now have rebuilding information, translated from manuals in German which are the only ones we could find online — complete instructions for both the freewheeling/Rollerbrake version and the coaster brake … Continue reading

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Shimmy, or speed wobble

A new article on shimmy, or speed wobble — what it is, why it happens, how to prevent it and how to recover from it.

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More tire-sizing updates

http://sheldonbrown.com/650b.html : added more info on “27 five” tires, and a photo (thanks to Aaron Goss!). http://sheldonbrown.com/tire-sizing.html : added several tire sizes

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Sheldonbrown.com’s angle on the Trek quick-release recall

Sheldonbrown.com’s angle on the Trek quick-release recall. This addresses technical issues which we haven’t seen covered in news reports.

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Update to the page on 26-inch tires

Update to the page on “26-inch” tires — there are actually 5 common tire sizes called 26-inch and if that isn’t enough one is also called “27.5” The updates cover new developments in availability, naming and tire widths.

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New tire sizes in Gear Calculator

Several tire sizes have been added to the Gear Calculator: Fatbike sizes: 26 inch tires, 26 x 3.8, 4.0, 4.25, 4.7 Wide 29ers: 29 x 2.7 and 3.0 32 inch and 36 inch (common on unicycles).

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