{"id":138,"date":"2016-03-04T21:33:00","date_gmt":"2016-03-04T21:33:00","guid":{"rendered":"https:\/\/redrocksreview.com\/index.php\/2016\/03\/04\/fat-tire-roundness-and-flex-at-psi\/"},"modified":"2016-03-04T21:33:00","modified_gmt":"2016-03-04T21:33:00","slug":"fat-tire-roundness-and-flex-at-psi","status":"publish","type":"post","link":"https:\/\/redrocksreview.com\/index.php\/2016\/03\/04\/fat-tire-roundness-and-flex-at-psi\/","title":{"rendered":"Fat Tire Roundness and Flex at PSI"},"content":{"rendered":"
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If you fat bike, you talk about tire pressure. The goal for many is to run as low a pressure as possible. I was curious just how much it differed at various pressures.<\/p>\n

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So with that, an Intel Edison and Flex sensor were used to look at PSI.<\/p>\n

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The flex sensor was stuck to the inside of a Maxxis Minion FBF 4.8″ tire on an 82mm DT Swiss rim.<\/p>\n

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The amount of flex of the tire was measured using Python on the Intel Edison and attached poorly to the wheel.<\/p>\n

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The test rig is my Moots Frosthammer and the test route was simple loops around my driveway.<\/p>\n

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Four tests were performed at 10,8,6 & 4 PSI.  The result below is an amount of flex relative to being totally flat.<\/p>\n

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Raw data graphed, the lower the number the more flexed the tire.<\/p>\n

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Since the Edison has Wifi I just SSH’d in and ran my test.<\/p>\n

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So what is the most interesting here too me, the tire gets the most flex at 6 PSI! Not 4 like I would have assumed, and is the most round at 10 PSI.<\/p>\n

I would have assumed 4 was the most flat, but interestingly while 4 PSI does not provide the widest footprint it does react the most. By that I mean the profile of the tire changes the most at 4 PSI.<\/p>\n

Just some Friday nerdery.<\/p>\n

-Joe<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

If you fat bike, you talk about tire pressure. The goal for many is to run as low a pressure as possible. I was…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-138","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/posts\/138","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/comments?post=138"}],"version-history":[{"count":0,"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/posts\/138\/revisions"}],"wp:attachment":[{"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/media?parent=138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/categories?post=138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/redrocksreview.com\/index.php\/wp-json\/wp\/v2\/tags?post=138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}