{"id":23761,"date":"2026-04-19T22:29:58","date_gmt":"2026-04-19T22:29:58","guid":{"rendered":"https:\/\/mybikething.com\/home\/?post_type=product&#038;p=23761"},"modified":"2026-04-21T21:24:14","modified_gmt":"2026-04-21T21:24:14","slug":"klein-attitude-comp-mtb-frame-17-med-3-5-lbs-zr9000-sunburst-fade-mint","status":"publish","type":"product","link":"https:\/\/mybikething.com\/home\/product\/klein-attitude-comp-mtb-frame-17-med-3-5-lbs-zr9000-sunburst-fade-mint\/","title":{"rendered":"Klein Attitude Comp MTB Frame | 17&#8243; Med | 3.5 lbs ZR9000 | Sunburst Fade &#8211; MINT"},"content":{"rendered":"<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\u2b50 <strong>Condition<\/strong> Near Mint \u2014 a few scuffs &#8211; very minor<\/p>\n<hr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\" \/>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\ud83d\udccf <strong>Will this fit me?<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Frame Size: Klein 17&#8243; \/ Medium<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The number to trust here is the effective top tube: at approximately 54cm, this frame sits squarely in medium territory by any modern sizing standard. Klein&#8217;s aggressive geometry \u2014 steep angles, short rear end, sloping top tube \u2014 means the seat tube was always going to be compact relative to reach.\u00a0 Don&#8217;t size this frame by the seat tube number. Size it by the reach.<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Top Tube (effective): ~54cm Actual: 56cm c-c<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Seat Tube: 16&#8243; center-to-top (Klein labeled 17&#8243;)<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Down Tube: 657mm center-to-center<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Chainstays: 420mm center-to-center<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Wheel Size: 26&#8243;<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Rear Dropout Spacing: 135mm<\/li>\n<\/ul>\n<hr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\" \/>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\ud83c\udfc6 <strong>The Story Behind the Frame<\/strong> <strong>Klein Attitude Comp \u2014 Serial #T BI-1246 \/ 19H 0100 NTUI123706R \u2014 Sunburst Fire Fade<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Gary Klein was an MIT-trained engineer who built his first aluminum frame as a student project in 1973. In a community south of Chehalis, Washington \u2014 a blue-collar logging town halfway between Portland and Seattle \u2014 Klein built his bike frame factory. His goal was to take the ordinary and make it extraordinary with the industry&#8217;s best materials and paint that cost upwards of $1,800 per gallon. The cherry on top? This frame was ridden before it was sold. The people who built these frames actually rode them. That&#8217;s a different kind of quality control.<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Compared to 6061, ZR9000 aluminum has yield strength about one-third higher and a fatigue life up to five times longer at the same loading.<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\ud83d\udeb4 <strong>The Ride<\/strong> The Attitude Comp has a reputation among veteran XC riders that hasn&#8217;t faded with time \u2014 stiff, responsive, and rewarding under hard efforts. The short chainstays and oversized tubing put pedaling power directly to the rear wheel with almost no flex loss. Riders who know how to set up a hardtail will find this frame pays back immediately. It&#8217;s not a comfort bike. It&#8217;s a performance bike that happens to look like a work of art.<\/p>\n<hr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\" \/>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\ud83d\udd27 <strong>What do I need to build this frame?<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Fork: 1-1\/8&#8243; threadless<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Headset: External 1-1\/8&#8243; threadless, 34mm cups<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Bottom Bracket: 73mm English (BSA) threaded<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Seatpost: 31.6mm<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Front Derailleur: 34.9mm band clamp, bottom pull<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Brakes: Cantilever or V-brake (rim brake only \u2014 no disc mounts)<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Rear spacing: 135mm \u2014 compatible with 8, 9, and 10-speed MTB drivetrains<\/li>\n<\/ul>\n<hr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\" \/>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\ud83d\udd27 <strong>Workshop Wisdom<\/strong> The internal cable routing through the top tube is a Klein signature \u2014 elegant when done right, fussy to set up. First set cables into shifters \/ brakes. Then run housing and barels to the internal guide holes. These have stops so housing wont slide through. Then route cable into the internal routing holes all the way to the rear side (exit side) &#8211; then slide housing internally and measure prior to cut.<\/p>\n<hr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\" \/>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\ud83d\udccb <strong>Other Frame Details<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Material: Klein ZR9000 proprietary aluminum alloy<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Made in USA \u2014 Chehalis, Washington \/ Waterloo, Wisconsin (Trek era, circa 2002\u20132003)<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Weight: 3.5 lbs (frame only)<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Serial: T BI-1246 \/ 19H 0100 NTUI123706R<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Paint: Sunburst fire fade \u2014 deep red \/ orange \/ yellow gradient, Durethane enamel finish<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Originally spec&#8217;d with XTR 9-speed<\/li>\n<\/ul>\n<hr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\" \/>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Is This Your Bike Thing?<\/strong> One of the finest American hardtail frames ever built \u2014 Klein&#8217;s fire fade Attitude Comp, ready for the build it deserves. Reach out before you buy and let&#8217;s make sure it&#8217;s the right fit.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Keywords:<\/strong> Klein, Attitude Comp, ZR9000, aluminum hardtail, 17&#8243; medium, 26&#8243;, sunburst fade, fire fade, vintage MTB, retro mountain bike, USA made, Chehalis, internal cable routing, 135mm spacing, V-brake, cantilever, 73mm English BB, 31.6 seatpost, Trek Klein, XC hardtail<\/p>\n","protected":false},"excerpt":{"rendered":"<p><iframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/Zai6S5QqHmM?si=Q8dSem3IeACn5fz0\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n","protected":false},"featured_media":23762,"template":"","meta":{"nf_dc_page":""},"product_brand":[],"product_cat":[55,894],"product_tag":[6247,6242,303,6250,6249,54,6241,6239,6143,6246,6244,791,3330,624,899,6245,6243,6251,1601,6248,2579,6252,6240],"product_folder":[],"class_list":{"0":"post-23761","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-a-bike-frames-forks","7":"product_cat-road-frames","8":"product_tag-135mm-spacing","9":"product_tag-17-medium","10":"product_tag-303","11":"product_tag-31-6-seatpost","12":"product_tag-73mm-english-bb","13":"product_tag-aluminum","14":"product_tag-aluminum-hardtail","15":"product_tag-attitude-comp","16":"product_tag-cantilever","17":"product_tag-chehalis","18":"product_tag-fire-fade","19":"product_tag-frame","20":"product_tag-internal-cable-routing","21":"product_tag-klein","22":"product_tag-medium-frame","23":"product_tag-retro-mountain-bike","24":"product_tag-sunburst-fade","25":"product_tag-trek-klein","26":"product_tag-usa-made","27":"product_tag-v-brake","28":"product_tag-vintage-mtb","29":"product_tag-xc-hardtail","30":"product_tag-zr9000","31":"product_shipping_class-bike-frames","33":"first","34":"instock","35":"taxable","36":"shipping-taxable","37":"purchasable","38":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/product\/23761","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/media\/23762"}],"wp:attachment":[{"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/media?parent=23761"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/product_brand?post=23761"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/product_cat?post=23761"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/product_tag?post=23761"},{"taxonomy":"product_folder","embeddable":true,"href":"https:\/\/mybikething.com\/home\/wp-json\/wp\/v2\/product_folder?post=23761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}