User talk:Pardo

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August 2009
Welcome to Wikipedia. Although everyone is welcome to contribute constructively to the encyclopedia, adding content without citing a reliable source is not consistent with our policy of verifiability. Take a look at the welcome page to learn more about contributing to this encyclopedia. If you are familiar with Citing sources, please take this opportunity to add references to the article. Eeekster (talk) 01:07, 28 August 2009 (UTC)

February 2010
Welcome again. Nice additions to Belt-driven bicycle and Bicycle brake systems. I'd just like to drop a friendly note about American English vs British English. The Bicycle brake systems article happens to be in British English and so 'calliper' is correctly spelled with two 'l's and 'tyre' is correctly spelled with a 'y'. Bicycle is in American English and motorcycle is in British English. Some of the articles are marked, as with the last two, but most are not. Bicycle and motorcycle dynamics is in American English and hasn't had must activity in a while, so maybe you'd like to give it a look. -AndrewDressel (talk) 02:43, 3 February 2010 (UTC)


 * Any chance of you having more sources about Milton W. Raymond's X-2? It sounds fascinating, but I doubt all those details were included in a passing mention in Bicycling Science. It appears not to be included in the 3rd edition, and I left my 2nd edition home. I'm particularly skeptical of
 * "true circle", in which the wheels steer equally in opposite directions and thus steering the bicycle without substantially changing the lateral position of the tire contacts relative to the center of mass
 * and so would like to read more details such as what steering axis angle, fork offset, and trail did he use for the front and rear wheel? Can we even find out the year(s) it was built and tested? -AndrewDressel (talk) 15:41, 9 February 2010 (UTC)

Right, I tried to say (tersely) it was mentioned in Bicycling Science, but it really is just mentioned, no details at all. As far as I know, nothing is published. X-2 was constructed and first tested in the early 1980's; Raymond was still working on it in the early 2000's, but stopped due to his declining health, although he was still interested up to his death. It was built originally with a vertical rear axis and conventional-ish front axis; when it failed to self-balance (perhaps due in part to a very long wheelbase) Raymond rebuilt it with adjustable steering angles and offsets, though it is unclear to me how much he tried various combinations and if so what they were. At least for the moment, X-2 still exists so it should be possible to at least measure the last-used configuration. However, it is unclear what would be gained, as it did not self-balance. I think the interesting dynamics here are when steered (rather than balancing itself) and the use of two steered wheels. X-2 is not alone in this regard, as the "Swing Bike" also steered both wheels, albeit steering the rear wheel via the pedals.

Your recent edits
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Proposed deletion of Murphy brake


The article Murphy brake has been proposed for deletion&#32; because of the following concern:
 * Does not pass WP:GNG

While all contributions to Wikipedia are appreciated, content or articles may be deleted for any of several reasons.

You may prevent the proposed deletion by removing the notice, but please explain why in your edit summary or on the article's talk page.

Please consider improving the article to address the issues raised. Removing will stop the proposed deletion process, but other deletion processes exist. In particular, the speedy deletion process can result in deletion without discussion, and articles for deletion allows discussion to reach consensus for deletion. Churchgoer251 (talk) 02:47, 23 February 2012 (UTC)

Murphy brake
Some one deleted Murphy brake. Any idea why? Peter Horn User talk 18:55, 9 October 2012 (UTC)
 * OK, I noticed User talk:Pardo above. Peter Horn User talk 03:55, 10 October 2012 (UTC)

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