{"id":95860,"date":"2025-06-15T12:27:07","date_gmt":"2025-06-15T10:27:07","guid":{"rendered":"https:\/\/bikefit.lu\/?post_type=product&#038;p=95860"},"modified":"2026-03-05T22:27:36","modified_gmt":"2026-03-05T21:27:36","slug":"profile-design-sonic-ergo-39a-2","status":"publish","type":"product","link":"https:\/\/bikefit.lu\/lb-lu\/product\/profile-design-sonic-ergo-39a-2\/","title":{"rendered":"39a Aluminum Extensions"},"content":{"rendered":"<h5>Specs<\/h5>\n<ul>\n<li><b>Construction:<\/b> 6061-T6 aluminum, pre-drilled for bar-end shifter cable routing<\/li>\n<li><strong>Extension <\/strong><strong>Length:<\/strong> 340 or 400mm<\/li>\n<li><strong>Extension Angle:<\/strong> 39 Degrees<\/li>\n<li><strong>Extension Rise:<\/strong> 87mm (bottom to top)<\/li>\n<li><strong>Extension Offset:<\/strong> 15mm total<\/li>\n<li><b>Outer Diameter: <\/b>22.2mm<\/li>\n<li><strong>Inner Diameter:<\/strong> 19.2mm<\/li>\n<li><strong>Shifter Compatibility:<\/strong> Electronic or Mechanical<\/li>\n<li><strong>Includes<\/strong>: Sold as a Pair (1 Right and 1 Left Extension)<\/li>\n<li><strong>Color:<\/strong> Anodized Matte Black<\/li>\n<li><strong>Weight:<\/strong> 206g\/pair<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p class=\"textbox ai-optimize-43\" dir=\"ltr\">The new range of extensions have evolved from their well proven T-Series. They have been designed to offer distinct fit options. They have also adopted a new naming system whereby the name gives the angle and material of the extension. Thus 39a is a 39\u00b0 bend in aluminum.   <\/p>\n<p class=\"textbox ai-optimize-44\" dir=\"ltr\"><strong>Performance<\/strong><\/p>\n<p class=\"textbox ai-optimize-45\" dir=\"ltr\">The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why they provide different fit options so each rider can chase their best performance.  <\/p>\n<p class=\"textbox ai-optimize-46\" dir=\"ltr\"><strong>Fit Data<\/strong><\/p>\n<ul>\n<li class=\"ai-optimize-49\">The 39a extensions have a 39\u00b0 for the grip . The rider can choose whether to hold high for the shrugged position or low for a more open, head up position. <\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2357\/3659\/files\/A-II-Ext-MSR-39a_480x480.jpg?v=1706569036\"><\/p>\n<ul>\n<li class=\"ai-optimize-50\">The 39a offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch. <\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2357\/3659\/files\/A-II-Ext-Offset-39a_1024x1024.jpg?v=1706569082\"><\/p>\n<ul>\n<li class=\"ai-optimize-51\">Of course we didn&#8217;t forget the importance of aerodynamics &#8211; adding a Kamm shaping to the rise section.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2357\/3659\/files\/A-II-Ext-AeroShaped-39a_480x480.jpg?v=1706635023\"><\/p>\n<ul>\n<li class=\"ai-optimize-52\">Lastly they added ergonomic shaped end caps making the hand grip more comfortable.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2357\/3659\/files\/A-II-Ext-Aero-Tip_1024x1024.jpg?v=1706566334\"><\/p>\n<p class=\"ai-optimize-53\"><strong>Origin<\/strong><\/p>\n<p class=\"ai-optimize-54\">Recent Trends in aerobar fit have been towards higher hand positions, so they&#8217;ve increased the rise compared to previous generation extensions. They have focused on the most popular angles from their previous range and added the 39a as a multi position option. <\/p>\n<p class=\"ai-optimize-55\"><strong>Tech Guide<\/strong><\/p>\n<ul>\n<li class=\"ai-optimize-56\">All the extensions have a 22.2mm diameter in the clamping area.<\/li>\n<li class=\"ai-optimize-57\">They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes.<\/li>\n<\/ul>\n<p class=\"ai-optimize-58\"><strong>Who is it for?<\/strong><\/p>\n<p class=\"ai-optimize-59\">The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips. <\/p>\n","protected":false},"featured_media":95864,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[4838],"product_tag":[5736,5737,5111,5116,5126,5181,5180],"class_list":{"0":"post-95860","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-kontaktpunkt-cockpit-lb-lu","7":"product_tag-39a-lb-lu","8":"product_tag-extensions-lb-lu","9":"product_tag-offroad-lb-lu","10":"product_tag-profile-design-lb-lu","11":"product_tag-road-lb-lu","12":"product_tag-triathlon-lb-lu","13":"product_tag-ultra-cycling-lb-lu","14":"product_shipping_class-large-items-lb-lu","16":"first","17":"instock","18":"taxable","19":"shipping-taxable","20":"purchasable","21":"product-type-variable"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>39a Aluminum Extensions - bikefit.lu<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bikefit.lu\/lb-lu\/product\/profile-design-sonic-ergo-39a-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"39a Aluminum Extensions\" \/>\n<meta property=\"og:description\" content=\"The new range of extensions have evolved from their well proven T-Series. They have been designed to offer distinct fit options. They have also adopted a new naming system whereby the name gives the angle and material of the extension. Thus 39a is a 39\u00b0 bend in aluminum.  Performance The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why they provide different fit options so each rider can chase their best performance.  Fit Data   The 39a extensions have a 39\u00b0 for the grip . The rider can choose whether to hold high for the shrugged position or low for a more open, head up position.    The 39a offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch.    Of course we didn&#039;t forget the importance of aerodynamics - adding a Kamm shaping to the rise section.   Lastly they added ergonomic shaped end caps making the hand grip more comfortable.  Origin Recent Trends in aerobar fit have been towards higher hand positions, so they&#039;ve increased the rise compared to previous generation extensions. They have focused on the most popular angles from their previous range and added the 39a as a multi position option. Tech Guide   All the extensions have a 22.2mm diameter in the clamping area.  They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes. Who is it for? The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bikefit.lu\/lb-lu\/product\/profile-design-sonic-ergo-39a-2\/\" \/>\n<meta property=\"og:site_name\" content=\"bikefit.lu\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-05T21:27:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/bikefit.lu\/wp-content\/uploads\/2025\/06\/39a-Side-2up_850x.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"850\" \/>\n\t<meta property=\"og:image:height\" content=\"850\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Availability\" \/>\n\t<meta name=\"twitter:data1\" content=\"In stock\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/bikefit.lu\\\/lb-lu\\\/product\\\/profile-design-sonic-ergo-39a-2\\\/\",\"url\":\"https:\\\/\\\/bikefit.lu\\\/lb-lu\\\/product\\\/profile-design-sonic-ergo-39a-2\\\/\",\"name\":\"39a Aluminum Extensions - 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Lastly they added ergonomic shaped end caps making the hand grip more comfortable.  Origin Recent Trends in aerobar fit have been towards higher hand positions, so they've increased the rise compared to previous generation extensions. They have focused on the most popular angles from their previous range and added the 39a as a multi position option. Tech Guide   All the extensions have a 22.2mm diameter in the clamping area.  They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes. Who is it for? The extensions will fit in any aerobar that is designed for 22.2mm. 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