We are here!

Harris cyclery logo

Ah, the hand-wringing. It seems to have started with inquired on our Facebook page, then posted on the road.cc blog without waiting for our response.

Harris Cyclery has closed after a 70-year run, hit hard by pandemic supply issues. Sheldonbrown.com got its start when Sheldon worked at Harris Cyclery, and we are very grateful to Harris Cyclery for its support. But, since 2010, sheldonbrown.com (except for the /harris pages) has floated its own boat, through online advertising.

We don’t know yet what other affiliation we may find, or whether we’ll go it alone, but you may rest easy. Ride your bike, and feel free to come to us for help keeping it in top shape.

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On-Road Repairs update

We have added to our page about on-road repairs. There is now a quick list so you can check which particular tools you might need for your bicycle, and we have covered some additional tools.

The basic on-road repairs will get you home or to the next bike shop on your bike, almost every time. If you can’t find the time or inspiration to learn them yourself, you might  ride with someone who did!

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ShelBroCo Quadratech

Introducing ShelBroCo QuadraTech Chainrings and sleeve nuts.

Throw away those obsolete chainrings! The unbearably vexing problem of sleeve-nut rotation has bedeviled generations of bicycle mechanics. Who else would you expect to come up with a solution but ShelBroCo?

ShelBroCo Quadratech System

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Derailer adjustment — and maintenance

We have added new sections on derailer maintenance to the derailer adjustment page, including how to cannibalize rear derailers, being careful about compatibility, and how to check cables,

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Modeling bicycle dynamics

We publish another paper by Osman Isvan. He uses a simplified model with only 3 degrees of freedom and simulates system frequency response under steady-state and transient conditions. He investigates the effects on vibration isolation of several key parameters including tire pressure, frame compliance and riding position. The graph below from his paper, one of several, shows results when tire pressure is changed.

Graph from Osman Isvan’s paper on bicycle dynamics

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Extensive revision of chainwheel bolt-circle information

Example templateA few months ago, a reader prompted us to make some updates to our chainwheel bolt circle cribsheet. But now we have followed up on that effort, greatly expanding our coverage, and we have added a set of templates which allow you quickly to identify the bolt circle of alnost every model of chainring, and the tooth count, without the need to measure or count by hand. It’s all here: https://sheldonbrown.com/cribsheet-bcd.html. Example template is at the right.

If you can correct any inaccurate information or you can identify a chainring that we do not cover, please let us know. We are not too proud to take corrections, and we’ll even credit you on the site for your contribution!

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GoPro Hero 5 Session camera

New article about the GoPro Hero5 Session action camera, latest in our series of articles about shooting video from a bicycle. This is a very small and light camera which will not weigh down a helmet and is especially good for use on a drone. It has some advantages and disadvantages worth knowing about.Note: the photo may be larger than life size! The camera is about 1 1/4 inches on a side.

GoPro Hero 5 Session action camera

GoPro Hero 5 Session action camera

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GPS not working right on your smartphone?

Older smartphone no longer maps bicycle routes well? Rides are recorded as 173,000 hours long? (Really!) New article by our friend Mark Sevier explains these problems and offers some solutions.

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Update to Bolt Circle Diameter Cribsheet

We have reviewed the bolt circle diameter cribsheet, checked bolt-hole spacings using trigonometry and made some corrections. Apparently, the spacings were measured rather than calculated based on angles — and measurement is never exact! We have also added entries for several new patterns. Some of the new ones with uneven spacings had to be reverse-engineered from photos and, though we think that we have them right, we welcome feedback.

Measuring bolt-circle diameter

Measuring two holes away, right side to right side (or left side to left side) gives the most accurate result with a 5-bolt chainring.

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Osman Isvan on Hills, Winds — and Data

Osman Isvan takes a deeper look into hills and winds.

  • Do you (or should you) work harder when climbing a hill?
  • How hard do you (or should you) work on a given hill? Does it depend on your gearing? The slope of the hill? What are all the relevant factors?
  • Do you (or should you) work harder against an uphill slope than you would work against a headwind? Why?

Hill and Wind factors in Osman’s effort

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