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

Testing a cotterless crank with a wrench

Testing a cotterless crank with a wrench

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 width of the square taper of a cotterless¬† crank with an ordinary open-end wrench!

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Reorganization of headset tables

headset

top headset

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 enlarged. The tables now are in order of head tube race seat size, as the frame is the more difficult and expensive to replace, followed by fork crown race seat size. The tables are used in the article on headsets  and several other articles.

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Shimano 4-speed hub gears

Shimano Nexus 4-speed coaster-brake hub

Shimano Nexus 4-speed coaster-brake hub

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 version. Thanks go to Patricia Morris for assistance with translation.

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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

Four "650" tire sizes -- photo thansk to Aaron Goss of Aaron's Bke Repair.

Four “650” tire sizes — photo thanks to Aaron Goss of Aaron’s Bicycle Repair.

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.

An assortment of quick-releases showing how far they open

An assortment of quick-releases showing how far they open

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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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