{"id":6462,"date":"2025-02-14T02:00:00","date_gmt":"2025-02-14T02:00:00","guid":{"rendered":"https:\/\/rcpress.com\/wp\/?p=6462"},"modified":"2025-02-14T02:00:00","modified_gmt":"2025-02-14T02:00:00","slug":"idr-vs-fdr","status":"publish","type":"post","link":"http:\/\/rcpress.com\/wp\/?p=6462","title":{"rendered":"IDR vs FDR"},"content":{"rendered":"<p>Gear ratio is a fundamental concept in RC car performance, balancing acceleration, speed, and torque.<\/p>\n<p>Internal Drive Ratio refers to the gear reduction inside the transmission or drivetrain before reaching the final wheels. It is determined by the car\u2019s built-in gearing (e.g., differential and internal gearbox).<\/p>\n<p>Final Drive Ratio (FDR) considers both the pinion and spur gears plus any internal reductions. It is calculated as:<\/p>\n<p>FDR = Internal Ratio \u00d7 (Spur Gear Teeth\/Pinion Gear Teeth)<\/p>\n<p>This number gives a better idea of how the overall system behaves. Higher gear ratios are useful for heavier cars or off-road vehicles that need more torque to move efficiently. Lower gear ratios are better for high-speed racing, where acceleration is less important than maintaining maximum velocity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gear ratio is a fundamental concept in RC car performance, balancing acceleration, speed, and torque. Internal Drive Ratio refers to&hellip;<\/p>\n","protected":false},"author":1,"featured_media":6463,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[124],"tags":[],"class_list":["post-6462","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-tip-drive-train"],"_links":{"self":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/6462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6462"}],"version-history":[{"count":1,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/6462\/revisions"}],"predecessor-version":[{"id":6464,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/6462\/revisions\/6464"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/media\/6463"}],"wp:attachment":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6462"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}