{"id":1538,"date":"2020-07-07T13:14:53","date_gmt":"2020-07-07T17:14:53","guid":{"rendered":"http:\/\/sheldonbrown.com\/blog\/?p=1538"},"modified":"2021-01-12T09:52:11","modified_gmt":"2021-01-12T14:52:11","slug":"update-to-bolt-circle-diameter-cribsheet","status":"publish","type":"post","link":"https:\/\/sheldonbrown.com\/blog\/2020\/07\/07\/update-to-bolt-circle-diameter-cribsheet\/","title":{"rendered":"Update to Bolt Circle Diameter Cribsheet"},"content":{"rendered":"<p>We have reviewed <a href=\"https:\/\/www.sheldonbrown.com\/cribsheet-bcd.html\">the bolt circle diameter cribsheet<\/a>, checked bolt-hole spacings using trigonometry and made some corrections. Apparently, the spacings were measured rather than calculated based on angles &#8212; and measurement is never exact! We have also added entries for several new patterns. Some of the new ones with uneven spacings had to be reverse-engineered from photos and, though we think that we have them right, we welcome feedback.<\/p>\n<figure id=\"attachment_1540\" aria-describedby=\"caption-attachment-1540\" style=\"width: 500px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-1540\" src=\"http:\/\/sheldonbrown.com\/blog\/wp-content\/uploads\/2020\/07\/bcd-measure1smIMG_0672-600x378.jpg\" alt=\"Measuring bolt-circle diameter\" width=\"500\" height=\"315\" srcset=\"https:\/\/sheldonbrown.com\/blog\/wp-content\/uploads\/2020\/07\/bcd-measure1smIMG_0672-600x378.jpg 600w, https:\/\/sheldonbrown.com\/blog\/wp-content\/uploads\/2020\/07\/bcd-measure1smIMG_0672-300x189.jpg 300w, https:\/\/sheldonbrown.com\/blog\/wp-content\/uploads\/2020\/07\/bcd-measure1smIMG_0672.jpg 650w\" sizes=\"auto, (max-width: 500px) 85vw, 500px\" \/><figcaption id=\"caption-attachment-1540\" class=\"wp-caption-text\">Measuring two holes away, right side to right side (or left side to left side) gives the most accurate result with a 5-bolt chainring.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>We have reviewed the bolt circle diameter cribsheet, checked bolt-hole spacings using trigonometry and made some corrections. Apparently, the spacings were measured rather than calculated based on angles &#8212; and measurement is never exact! We have also added entries for several new patterns. Some of the new ones with uneven spacings had to be reverse-engineered &hellip; <a href=\"https:\/\/sheldonbrown.com\/blog\/2020\/07\/07\/update-to-bolt-circle-diameter-cribsheet\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Update to Bolt Circle Diameter Cribsheet&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"sfsi_plus_gutenberg_text_before_share":"","sfsi_plus_gutenberg_show_text_before_share":"","sfsi_plus_gutenberg_icon_type":"","sfsi_plus_gutenberg_icon_alignemt":"","sfsi_plus_gutenburg_max_per_row":"","footnotes":""},"categories":[3],"tags":[1057,5,1058,1059,1055,247,517,61,244,1060],"class_list":["post-1538","post","type-post","status-publish","format-standard","hentry","category-updates","tag-bcd","tag-bicycle","tag-bolt-circle","tag-bolt-circle-diameter","tag-chainring","tag-chainwheel","tag-crank","tag-crankset","tag-diameter","tag-stack-bolts"],"_links":{"self":[{"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/posts\/1538","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/comments?post=1538"}],"version-history":[{"count":3,"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/posts\/1538\/revisions"}],"predecessor-version":[{"id":1543,"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/posts\/1538\/revisions\/1543"}],"wp:attachment":[{"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/media?parent=1538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/categories?post=1538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sheldonbrown.com\/blog\/wp-json\/wp\/v2\/tags?post=1538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}