From Open Source LongTail Technology
Xtracycle LongTail Standard - Shared Source information
The bicycle industry is entering a new age of bike design. Changing culture and rising costs of resources are getting more people onto bikes, many of which are used for commuting, hauling groceries, or good old off-road fun. Xtracycle has been building the Free Radical kit for almost 15 years, with other manufacturers such as Surly jumping on the bandwagon to create one-piece frames. Sun has recently released the Atlas Cargo, an affordable full frame LongTail that is partially compatible with the LongTail Standard. Smaller fabricators are making their own bikes, and the demand for a shared standard is increasing.
What is Shared Standard?
Shared Standard programs allow individuals and organizations to access Xtracycle's LongTail Standard info for reference (e.g. when developing complementary systems), for review from a compatibility perspective (e.g. home prototyping, small scale fabricators, OEMs, and companies building bikes to meet the LT Standard).
1. It helps the customer.
Shared standards are rare in the bike world, but becoming commonplace in other industries. Consider Xtracycle the iOS or Android operating system for your bike. Having the Xtracycle installed, and the new expansion ports availble extends the capability of your bike many fold. Atop the basic operating system (i.e. the Xtracycle platform) can run various App's or in our case, Acc's (i.e. Xtracycle Accessories). While Xtracycle intends to be the dominant provider of the operating system or platforms (leveraging our production at scale, our growing distribution network, our extensive testing and user base), we acknowledge that we cannot create all the possible Acc's that all customers will want. That's where you come in. Access our shared source to develop your own Acc's (that's short for Accessories) for our platform. Sell those Acc's on your own website, or sell them on ours - we'll help you turn your passion for cycling into a revenue stream while connecting you to the most vibrant bicycle community on earth.
2. It helps the cargo bike retailer.
Cargo bike retailers have limited time, and full plates. Retailers need synchronization across product lines so they can buy more of fewer accessories at better margins to meet more customer needs. Cargo bikes beget accessories - whether they are to help carry stuff, passengers, perform in different weather conditions, or just for fun, all cargo bikes need accessories. We believe that Xtracycle's design mentality and history of success position our products to be the dominant solution within the affordable cargo bike space. As other manufacturers join in, making Acc's (that's short for accessories) or LT compatible bikes, retailers will benefit as they can sell many brands and solutions that all play nice together. Retailers are at the forefront of growing the reach of the bike industry - it's our job to make their job easier and more profitable, so they can reinvest in marketing, outreach and advocacy.
3. It helps the industry.
Other manufacturers will jump on the LongTail Standard bandwagon - many already have. Major manufacturers will too, it is simply just a matter of time. In the interest of extending the reach of our products and our vision for bikes, growing the market for Xtracycle Acc's, Xtracycle may choose to license our intellectual property to the right industry partner to scale our impact. Our original vision was to change the bike industry by introducing a new class of bicycle that could surpass the appeal of recent major trends in cycling (think the Mountain Bike). We now are seeing the industry embrace LongTail bicycles, and we are turning our attention to a new challenge. Before us stands the task of leveraging great products and service to catalyze individuals to conserve money and global resources by using bikes for more of their transportation needs. We cannot do this alone. To this end, we look to share our wisdom and benefit from the collective momentum around LongTail Standard compatible bikes, accessories, and solutions.
Xtracycle Intellectual Property
Xtracycle possesses critical intellectual property as detailed below.
Xtracycle has a utility patent on the FreeRadical cargo extension.
Xtracycle owns a trademark on the name "Xtracycle." Use of this name to describe or advertise your product without our written permission is in violation of the law.
Respecting the Shared Standard
Xtracycle has chosen to share the 'source code' for our inter-compatible line of bases and accessories so that other manufacturers and designers may design to our standard. Note, this shared-source relationship between us and you doesn't mean you are free to make and sell your own Free Radical like extensions, or independently claim that your product is 'LongTail Standard' compatible or Xtracycle Friendly. We see ourselves as the curators and stewards of this standard, and we determine which products merit the Xtracycle Friendly LongTail Design badge of approval.
Xtracycle Shared Source licensing permits non-commercial distribution of the source information (i.e. the content on this Wiki). Commercialization of the Long Tail Standard, use of the Xtracycle trademark without permission, or infringement of our patent is strictly forbidden.
We have provided this Wiki-based community forum to invite your feedback on the LongTail Standard and participation in the development of LongTail specific Acc's (Accessories). We have password protected certain documents to ensure against abuse of the above terms.
If you have specific questions about how you can engage with the LongTail Standard development community, please direct your questions to email@example.com.
Established Frame Standards
The two most important documents for framebuilders:
These pages explain the existing dimensions, and are intended to provide designers with deeper explanation of why things are the way they are, and what problems have been encountered before. For the authoritative dimensions and requirements, always refer to the LongTail Frame Standard and the Longtail Dimensions pages. This is a PDF that contains all of the details relevant to the frame of a longtail bike. It repeats much of the information below. For the final word, refer to the PDF.
- Terminology and Anatomy of the Free Radical
- H-rack Locations
- V-rack Locations
- Size of tubing
- Keep-out spaces for accessories
- Disc Brake Mount
- Rohloff mount
- Dropout direction
- Derailleur hanger
- Fender Mount
- Freeloader Strap Mounts
- Cantilever Stiffening
- Kickstand Plate
- Adventure Kit
Projects designed to be completed, with relative ease, at home, on your own, but we highly suggest having a friend help, hence, Do-It-Together.
- Pizza Loader
- Surf Board Rack
- Tray Bien Bike Carrier
- Passenger Canopy
- Amphibious Xtracycle
- Mobile bike based BBQ
A place for designers to discuss what should be made, and how. When creating new subjects, try to use the need that's being addressed, instead of the particular product. Make sure you delineate between what's a discussion and what's solid information. Also, remember that while Xtracycle isn't here to steal your ideas, anything you put on here is now open-source and as such is available for everyone to use freely.
- 2/3-Kid Carrier
- 29er compatible Longtail
- Mobile Pet Salon
- Propaganda holder
- Small dog carrier - specifically French Bulldogs
- 20"/Folding bike compatible Longtail
Please visit the Community Portal to share your custom designs, mods and ideas with other Xtracyclers.