Calvin's Corner

Mechanical musing and industry insights from Park Tool Director of Education Calvin Jones.

  • Ride 2 Recovery: Great Lakes Challenge

    The Ride 2 Recovery is a non-profit organization that sponsors rides around the USA for injured military veterans. Ride 2 Recovery considers cycling an important part of the recovery process. It is something most all of the patients with mental and physical disabilities can participate in, and it's just fun.

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  • Measuring Up

    How we choose to measure things is important. Most of the world uses the metric system of measurement. While the metric system is based on a standard meter, for mechanical uses such as on bicycles, it is will help to understand metrics better if you consider the millimeter the basic unit.

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  • Cities, Bicycles, and the Future of Bells

    Bike gatherings are always of interest, at least to bike-minded people. In the middle of June there was something of a "gathering of tribes" in the Twin Cities, Minnesota area. The Nature Valley Grand Prix was in town. Cyclists clad in bright Lycra from all over the USA and the world are competing here in a grueling five-day race. The bikes are sleek, the athletes fit, and everyone shares a common goal... to WIN!!

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  • Getting a Sense of the Problem

    In bicycle repair, or any other mechanical work for that matter, we should bring to the table our five senses. We need as much input as possible in order to process the data and come to a resolution on the issues before us. This article will expatiate upon the "five senses" and how they facilitate our ability to diagnose and repair. There are some that may advocate for a sixth sense, but you will not find me among them.

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  • Campagnolo® Ultra-Torque™ and Record® Group

    As manufacturers release new groups and components, there are often new features that require new service procedures. This article will discuss the newer component groups available from Campagnolo®.

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  • CYCLING... the book

    With the arrival of summer, it is prime time for good riding and fine reading. In this edition of Calvin's Corner I will provide a book report of a tome which influenced me, and my way of thinking. It is sometimes long after reading a piece of literature, and then by rereading it, does it become clear what it means to you. Such a book is CYCLING, published by the C.O.N.I. (Comitato Olimpico Nazionale Italiano), Rome, Italy.

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  • Gore® Ride-On® Cable Installation

    This article will describe the installation of the Gore® Ride-On® cable system. This is a cable housing system that relies on a tubing system to seal the inner shifting or brake wire, thereby preventing dirt and water from entering. The system is composed of housing, a full length removable liner tube, a coated brake (or shift) wire, end caps (ferrules) for both frame housing stops and component housing stops, "grub" seals for ends of the wire system, cable end crimps, and crimp covers.

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  • Shimano® Coasting System

    This article will discuss the Shimano® "Coasting" system. The Coasting system uses a 3-speed internal hub. The shifting is done automatically the "Automatic Unit." The electricity to operate the Automatic Unit comes from the dynamo (generating) front hub.

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  • Thinking About Your Ride

    The optic of this article will be on the relationship of the human body with the bicycle. There is both an art and science to placing and positioning the human body on a bicycle for maximum performance. This article addresses you as a casual cyclist rather than as the elite level cyclist, who must concentrate on maximum performance. It asks you to think about how you sit on a bike. You will enjoy riding more by using common sense, paying attention to how you feel, and by using trial and error in your positioning.

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  • This I Believe

    It is difficult to go through life and not wonder if you are doing anyone any good. As the 2008 Olympic Games begin, it gives me pause to think about what I have done, or not done, for, well, the world.

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