Author Archives: John

SunTour Perfect, Pro-Compe and New Winner freewheels

Posted on September 2, 2015 by John

New page on SunTour Perfect, Pro-Compe and New Winner freewheels. These are no longer made, but there are a lot of them around and they offer many options including the ability to work with older frames that have smaller overlocknut … Continue reading →

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Cyclecomputer and GPS accuracy

Posted on August 29, 2015 by John

New page about the history of distance and speed measurement on bicycles, and the limitations of accuracy in measurement. Did you know that GPS readings wander, so you can rack up some distance even if you are standing still?

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Cyclecomputer database

Posted on August 17, 2015 by John

Our pages of cyclecomputer instructions have now been brought completely up to date, with links to user manuals for almost every make and model, including GPS. These pages are a unique resource.

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Additions to the Gear Calculator

Posted on July 25, 2015 by John

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

Posted on July 18, 2015 by John

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

Posted on July 11, 2015 by John

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

Posted on July 2, 2015 by John

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

Posted on June 4, 2015 by John

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

Posted on May 23, 2015 by John

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

Posted on May 14, 2015 by John

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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