April 12, The Unicrown Fork Those who have been reading this blog for some time, are no doubt familiar with my rants against unicrown forks. When the topic comes up, some agree, others question my fixation on this detail, and others still want to know what a unicrown fork is. Now that I am temporarily living with a unicrown forked bike , the time seems right to elaborate. A vey basic primer in bicycle fork construction: There are many fork crown designs in existence, but the general concept is the same. Now, a unicrown fork is constructed differently in that there is no crown. The two fork blades are bent towards each other at the top, then typically welded together at the steerer tube. A unicrown fork is simpler and less expensive to make than a lugged crown fork, which is why it has become so ubiquitous among contemporary bicycle manufacturers. For some time now I’ve been trying to figure out the history of the unicrown fork, and I keep reading about the first mountain bikes, BMX bikes, and the quest for rigidity – suggesting that its origins were in the s.
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A positive number means your head angle will increase; you’re installing a shorter fork. The diagonal row of zeros shows, of course, that if you replace an old fork with a new fork of the same length, there will be no change in head angle. If all else remains the same, a steeper head angle is quicker handling, while a shallower head angle is slower handling.
KMC ZHXドロップバスターBMX自転車チェーン（1速、cm x cm、L、シルバー）【海外直送】 – KMC ZHX DropBuster BMX Bicycle Chain (1-Speed, cm x cm, L, Silver).
This began to turn around in the camera and electronics industries in the s, but Japanese companies didn’t figure out how to make and sell bicycles for the U. As the s opened, the U. While Japanese bicycles were manufactured to very tight tolerances, and nicely finished considerably better than their European competition , the Japanese had not yet come to terms with the average American’s being taller and heavier than the average Japanese.
This gap was wider at the time than it is now, due to the privations the Japanese population suffered during and after the war. Royce Union he most widely distributed Japanese bike of this era was sold under the name Royce Union. This was a speed, pretty much all steel except for the handlebar stem and the Dia Compe brakes. This bike was only available in one size, 20″, which was considerably too small for an average American man.
Frame identification by frame number
It was not until I applied the Japanese Imperial calender could I sort out variations in the model list. Not all Japanese manufacturers use it and it may not be used now. The western date for the year 1 on the Japanese Imperial calender is Manufacturers sometimes just use the last numeral as the one they list ie 3 could represent , , etc to which could mean the year the tubing was made, 6 years before
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Vintage Bicycle Genealogy and Archive
Posted by John Ellsworth at 5: I retired the Kestrel, got rid of the Columbia cruiser and my Trek MTB, and most recently sent the Shogun in triple form off to live with my folks with the hope that Dad would make some use of it in the coming years. But moving from a house with a barn to an apartment with no onsite storage has given me the need and the opportunity to think more about simplifying my bicycle situation.
BMX”all tubes chromoly frame”serial#M4K) Tange forks, Sugino VP BMX 44 crank. In good condition, straight, some minor surface rust, bubbling. I am happy to answer any questions or send more detailed photos upon request.
Included at his site is Jalon’s excellent write up of the geometry and physical properties of the various tubings and what it all means. The length of some of the tubes in a set is different between makers as is the length of butted sections. As a result, the total tubeset weights are not indicative of the relative weight of the resulting bike. They were a clever French innovation using a special cassette of cogs that mounts onto a special hub. Great idea, but poorly engineered and tested; they proved to be unreliable.
For more information, see Sheldon Brown’s comments at http:
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Larger Image The name says it all – the top of the Schwinn line. Schwinn today is part of Pacific Cycle. While Schwinn often had a reputation for building heavy bikes for kids, the Paramount line had a reputation for finely crafted, relatively light road bikes. That is obviously a great price. The very nice woman selling it was good natured about the low price.
• New Old Stock dating from around • New in original packaging, chrome does have some minor pitting. • Keep in mind these are nearly 30 years and have moved around the world a bit so may have some minor blemishes.
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Classic Redline BMX project
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This collection of forks is probably a good representation of the total range of road fork lengths in production. The longest, the Tange CrMo TIG unicrown fork, can be found on many production road bikes made in the mid ‘s.
You know you need to get some exercise, and biking seems a likely choice. You need to buy your first mountain bike. Most people simply have a budget and expect to get a decent enough bike with this. But what exactly is a decent enough bike? It depends on what you need, or what you think you need. Here are some tips on how to buy your first bike. Be prepared to spend if you want a quality ride. Think about your goals and your budget It is possible to get a mountain bike for around Php 4, These are the no frills generic bikes sold in malls and stores where parents get toy bikes for their toddlers.
They are generally heavy, have less durable components, and are butt ugly. If you plan to go farther, weight becomes an issue, which means you need to look beyond the generic bikes, and spend a bit more. The difference is like online dating and then finally meeting eyeball to eyeball with your date. The bike of your dreams may just be waiting for you in your friendly neighborhood LBS.