Category Archives: Tires


Compass Tires: Standard vs. Extralight

Compass tires are available in two versions: standard and extralight. What is the difference between the two? The difference is in the casing. The standard casing is already quite light and supple, but for the Extralight, we worked with Panaracer … Continue reading

Posted in Tires | 42 Comments

Research & Development

Over the last decade-and-a-half, I’ve thought a lot about product development. Long before Bicycle Quarterly and Compass Bicycles, I was involved with several companies as a technical writer and translator. Part of my job was writing instructions, so I got … Continue reading

Posted in Testing and Tech, Tires | 43 Comments

Tire Pressure: Data and Details

A little while ago, I wrote about how new scientific research has allowed us to design wide, supple tires that offer the speed of narrow, high-end racing tires. The key finding is that above a certain threshold, increasing tire pressure … Continue reading

Posted in Testing and Tech, Tires | 19 Comments

The Tire Pressure Revolution

Of all our research on tires, the most revolutionary finding is this: Tire pressure has almost no effect on a tire’s speed. We did not believe it at first, either, so we’ve tested it numerous times. It’s been confirmed numerous … Continue reading

Posted in Testing and Tech, Tires | 124 Comments

TPI and Tire Performance

Tires with supple casings are faster, more comfortable and simply more fun to ride. Most cyclists know this, but how do you measure “suppleness”? A measure that often is used to describe the quality of tires is “threads per inch” … Continue reading

Posted in Tires | 21 Comments

Optimizing Tire Tread

Most tire manufacturers agree that supple sidewalls and a thin tread make a tire fast, but the role of the tread pattern remains poorly understood. Most modern tires have either a completely smooth tread (slicks) or a coarse tread pattern … Continue reading

Posted in Tires, Uncategorized | 54 Comments

The Actual Width of Tires?

Sometimes we get an e-mail or a phone call from a customer asking, “I bought the Compass 32 mm tires, but they only measure 28.5 mm on my rims. Why is this?” Decades ago, some tire makers cheated when stating … Continue reading

Posted in Tires | 26 Comments