Air bag helmet demo

An air bag bicycle helmet has been in the news lately, and there is an evaluation of it online, if you care for the details. However, years ago, Sheldon posted a scan of a poster for another air bag helmet on the site. Unfortunately, he had only a rather worn copy to scan from. We’ve now had the loan of a copy in fine condition and had it professionally scanned. A small copy of it is below but you may view it in its full glory elsewhere on the site.

Air bag helmet poster

Air bag helmet poster

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Shimano Alfine 11-speed hub

New article about the Shimano Alfine 11-speed hub. Thanks to Bruce Dance for most of the text, also Aaron Goss!

Shimano Alfine 11-speed hub

Shimano Alfine 11-speed hub

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Lock Strategy

Our article on locking bicycles has been updated and expanded. Don’t let your bicycle get stolen!

How to use a Kryptonite lock

How to use a Kryptonite lock

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ShelBroCo Helium!

Helium weighs only 0.13 times as much as air. Imagine what it can do for your tires! Find out about ShelBroCo Helium!

Helium tanks

Helium tanks

Helium-copter

Heliumcopter

Helium app

Helium app

Helium drop

Helium drop

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Shimano 9-speed cassettes

One-ramp sprocket for Shimano Hy0perglide cassette

One-ramp sprocket for Shimano Hyperglide cassette

Two-ramp 15T sprocket for Shimano Hyperglide cassette

Two-ramp 15T sprocket for Shimano Hyperglide cassette

Major update to our page on Shimano and Shimano-compatible 9-speed cassettes. We’ve fixed broken links from when manufacturers updated *their* Web pages, and updated information on availability.

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SRAM Automatix 2-speed hub

New article about the SRAM Automatix two-speed hub. We have information on maintenance, choice among variant models, and how to adjust the speed at which it shifts automatically.

Exploded diagram of the SRAM Automatix hub

Exploded diagram of the SRAM Automatix hub

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Morrow coaster brake page revised

Sheldonbrown.com keeps reference material available on older coaster brakes and internal-gear hubs. We’ve just revised the page on the antique Morrow coaster brake

Morrow coaster brake

Morrow coaster brake


 

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Customizing a fatbike

Bruce ingle on his customized fatbike

Bruce Ingle on his customized fatbike

Bruce Ingle customizes a fatbike —

Fatbikes are intended for use on soft, muddy, sandy, snowy surfaces but they need customization to make them truly practical for such use — in particular, fenders, wide-range gearing including ultra-low gears, and a way to carry baggage. Our new article will help you to customize a fatbike, but also gives you a look into customizing bicycles, in general.

The article is taken from a running e-mail discussion in which Bruce contemplates choices, decides on a bicycle purchase, and describes the various steps of customization and how they worked out.

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Gear Calculator updated and now also in German

The Sheldon Brown gear calculator is updated and improved: more tire sizes are covered including fatbikes, 29ers, 29+ and monster bikes, and we now have a version in German, as well as French.

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Remembering Sheldon

“The bicycle on the cover was produced on the Management Graphics Table Top Slidemaking System at Crimson Camera Technical Sales in Boston.  A bicycle enthusiast created the image using the tablet menu and cursor tracker.  The bicycle is made up of 99 vectors, 20 circles, and 5 ellipses.  This simple graphic was created to illustrate to customers what 4000-line resolution looks like.”

The “bicycle enthusiast” was Sheldon Brown who worked for a short time at Crimson Camera.  Sheldon died eight years ago today.
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