{"product_id":"box-one-20-rim-451x17-5mm-28h-with-brake-surface","title":"Box One 20\" Rim 451x17.5mm 28h With Brake Surface","description":"\u003ch1\u003eBox One Focus 20\" Rim 451×17.5mm 28h With Brake Surface\u003c\/h1\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Box One Focus is a lightweight double-wall rim designed for 20\" BMX racing wheels. Built with a low-profile extrusion that removes excess material, this 28-hole rear rim weighs 280 grams and includes a machined braking surface for caliper or U-brake compatibility. Single eyelet construction allows higher spoke tension for improved wheel stiffness and durability.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cp\u003e• \u003cstrong\u003eDouble-wall construction\u003c\/strong\u003e – Inner support wall distributes spoke tension and impact loads across the rim structure for improved strength-to-weight ratio\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eSingle eyelets\u003c\/strong\u003e – Metal inserts at each spoke hole resist spoke pull-through under high tension, allowing tighter wheel builds without rim failure\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eLow-profile extrusion\u003c\/strong\u003e – Minimized material in non-structural areas reduces rotational weight without compromising lateral stiffness\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eMachined brake surface\u003c\/strong\u003e – Sidewalls are precision-machined to provide consistent braking performance with caliper or U-brake systems\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eENBMX compliant\u003c\/strong\u003e – Meets or exceeds European BMX standards for race rim performance and durability\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp\u003e• \u003cstrong\u003eRim size:\u003c\/strong\u003e 20\" × 1 1\/8\" (451mm BSD)\u003cbr\u003e• \u003cstrong\u003eInternal width:\u003c\/strong\u003e 17.5 mm\u003cbr\u003e• \u003cstrong\u003eSpoke holes:\u003c\/strong\u003e 28h\u003cbr\u003e• \u003cstrong\u003eWeight:\u003c\/strong\u003e 280 g (9.87 oz)\u003cbr\u003e• \u003cstrong\u003eERD (Effective Rim Diameter):\u003c\/strong\u003e 438 mm\u003cbr\u003e• \u003cstrong\u003eMaterial:\u003c\/strong\u003e 6061-T6 alloy\u003cbr\u003e• \u003cstrong\u003eWall type:\u003c\/strong\u003e Double-wall with single eyelets\u003cbr\u003e• \u003cstrong\u003eBrake compatibility:\u003c\/strong\u003e Rear wheel with machined brake surface (caliper\/U-brake)\u003cbr\u003e• \u003cstrong\u003eColor options:\u003c\/strong\u003e Anodized Black, Red, Blue, Gold\u003c\/p\u003e\n\u003ch2\u003eCompatibility and Ideal Use Cases\u003c\/h2\u003e\n\u003cp\u003eDesigned for rear wheels on 20\" BMX race bikes using rim brakes (caliper or U-brake). The 28-hole drilling pairs with standard BMX racing cassette or freewheel hubs for lightweight wheel builds. Best suited for competitive racing where weight savings and reliable braking are both required. 451mm BSD fits standard 20\" × 1 1\/8\" race tires. Not recommended for disc brake setups—brake surface adds weight unnecessary for disc applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e US orders ship direct from manufacturer and may arrive separately from other items.\u003c\/p\u003e \u003cdiv\u003e\u003cp.\u003e\u003ci\u003e\u003cu\u003e\u003cfont size=\"2\"\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/font\u003e\u003c\/u\u003e\u003c\/i\u003e\u003c\/p.\u003e\u003c\/div\u003e\u003cdiv style=\"\"\u003e\u003ci style=\"font-size: 0.875rem;\"\u003e\u003cu\u003e\u003cfont size=\"3\"\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/font\u003e\u003c\/u\u003e\u003c\/i\u003e\u003c\/div\u003e\u003cdiv style=\"\"\u003e\u003ci style=\"font-size: 0.875rem;\"\u003e\u003cu\u003e\u003cfont size=\"3\"\u003e\u003cb\u003e**Due to unique nature of this item, ALL sales of this product are FINAL. No Refunds or Returns**\u003c\/b\u003e\u003c\/font\u003e\u003c\/u\u003e\u003c\/i\u003e\u003c\/div\u003e","brand":"BOX COMPONENTS","offers":[{"title":"Red \/ 20\"x1-1\/8\"-1-3\/8\" (451MM)","offer_id":45037972521139,"sku":"BX-RM1345128-RD","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Polish \/ 20\"x1-1\/8\"-1-3\/8\" (451MM)","offer_id":45037972455603,"sku":"BX-RM1345128-SL","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 20\"x1-1\/8\"-1-3\/8\" (451MM)","offer_id":45037972422835,"sku":"BX-RM1345128-BK","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Blue \/ 20\"x1-1\/8\"-1-3\/8\" (451MM)","offer_id":45037972488371,"sku":"BX-RM1345128-BL","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8737\/2979\/files\/box-one-20-rim-451x175mm-28h-with-brake-surface.jpg?v=1779480717","url":"https:\/\/time2shinebmx.com\/products\/box-one-20-rim-451x17-5mm-28h-with-brake-surface","provider":"Time 2 Shine ","version":"1.0","type":"link"}