{"title":"BTS - Behind the Saddle Mounts","description":"\u003ch2\u003eWider than the pro default. Measurably faster.\u003c\/h2\u003e\u003cp\u003eBehind-the-saddle hydration has become the pro-field standard — every serious tri and TT setup now runs two bottles behind the saddle. The question is how they're mounted. Most systems put the bottles close together. AeroGain mounts them wide apart, in a V-formation, and in velodrome population testing that spacing measured \u003cstrong\u003e1–4 W faster than close-together mounting\u003c\/strong\u003e (n=17 athletes, 45 km\/h, 0° yaw). The wider the V, the less the bottles' aerodynamic wakes cancel each other out.\u003c\/p\u003e\u003ch3\u003eWhy wider is faster\u003c\/h3\u003e\u003cp\u003eBehind the saddle, each bottle sits in the rider's wake, partially filling the low-pressure void that would otherwise drag the rider back. When bottles are mounted close together, their wakes overlap — each bottle reduces the benefit the other provides. Opening them into a wide V lets each bottle work independently. The physics is straightforward; most systems don't exploit it because wider spacing is harder to engineer securely.\u003c\/p\u003e\u003ch3\u003eWhat's in this category\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAero BTS PRO system\u003c\/strong\u003e — the flagship. Tightest shell geometry, 900 ml integrated storage, 1–2 W faster than the standard BTS. Banned at Ironman Texas when ridden by Vincent Luis on debut — now fully approved by World Triathlon and Ironman.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAero BTS system\u003c\/strong\u003e — the standard. Same wide-V bottle positions and saddle clamp as the PRO. 800 ml storage, 60 g lighter, €50 less.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAero BTS PRO cup\u003c\/strong\u003e — PRO cup only, without saddle clamp. For riders who already have a compatible clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAero BTS cup\u003c\/strong\u003e — standard cup only, without saddle clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAero BTS Carbon Saddle Clamp\u003c\/strong\u003e — saddle-specific, carbon-rod clamp. Sold separately. Fits both cups.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHow to choose\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eStarting from scratch?\u003c\/strong\u003e Buy the full system — PRO or standard. Both include the saddle clamp. Choose PRO for the tightest shell (1–2 W faster than the standard BTS), 900 ml of storage, and a white logo that matches the Aero Cockpit. Choose the standard for the same wide-V geometry at 60 g less and €50 less.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAlready have a clamp?\u003c\/strong\u003e Buy the cup only. The PRO cup (900 ml) and standard cup (800 ml) both fit all Aero BTS Carbon Saddle Clamps.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNeed a clamp?\u003c\/strong\u003e The Aero BTS Carbon Saddle Clamp is sold separately. Each variant is tooled to one specific saddle — select yours from the variant list.\u003c\/p\u003e\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from other behind-the-saddle systems?\u003c\/strong\u003e\u003cbr\u003eBottle spacing. Most systems mount bottles close together — but close-together mounting overlaps the bottles' aerodynamic wakes, reducing the benefit each one contributes. The AeroGain wide V spaces them further apart so each bottle fills the low-pressure zone independently. That is why our velodrome data shows 1–4 W of advantage over the close-together default.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's the difference between the PRO and the standard?\u003c\/strong\u003e\u003cbr\u003eBoth use the same bottle positions and the same saddle clamp. The PRO adds a shell that hugs the bottles more tightly (1–2 W over the standard), 900 ml of storage vs 800 ml, and a white logo to match the Aero Cockpit. The standard is 60 g lighter and €50 less.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I upgrade from the standard cup to a PRO cup later?\u003c\/strong\u003e\u003cbr\u003eYes. The saddle clamp is shared between both systems. Buy the Aero BTS PRO cup and it mounts directly to your existing clamp.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eAero figures from AeroGain in-house velodrome population testing, n=17 athletes, 45 km\/h, 0° yaw, vs. two 750 ml bottles mounted close together. Full whitepaper available on request.\u003c\/em\u003e\u003c\/p\u003e","products":[{"product_id":"shiv-fuelcell-aero-bottle-mount","title":"Shiv Fuelcell aero bottle mount","description":"\u003cp data-start=\"2429\" data-end=\"2545\"\u003eLid for Specialized Shiv Tri Hydration Fuelcell, with integrated brackets for mounting a bottle cage on top.\u003c\/p\u003e\n\u003cul data-start=\"2547\" data-end=\"2847\"\u003e\n\u003cli data-start=\"2547\" data-end=\"2619\"\u003e\n\u003cp data-start=\"2549\" data-end=\"2619\"\u003eCompatible with the \u003cstrong data-start=\"2569\" data-end=\"2593\"\u003eSpecialized Shiv Disc Tri\u003c\/strong\u003e (Fuelcell version only)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2620\" data-end=\"2668\"\u003e\n\u003cp data-start=\"2622\" data-end=\"2668\"\u003eDirect replacement for original Fuelcell lid\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2669\" data-end=\"2746\"\u003e\n\u003cp data-start=\"2671\" data-end=\"2746\"\u003eMounting brackets allow secure installation of a standard bottle cage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2747\" data-end=\"2805\"\u003e\n\u003cp data-start=\"2749\" data-end=\"2805\"\u003eIdeal for longer races where extra hydration is needed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2806\" data-end=\"2847\"\u003e\n\u003cp data-start=\"2808\" data-end=\"2847\"\u003e\u003cem data-start=\"2808\" data-end=\"2847\"\u003eFuelcell and bottle cage not included\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2849\" data-end=\"2919\"\u003eGive your Shiv Tri added versatility with a top-mounted bottle option.\u003c\/p\u003e","brand":"AeroGain","offers":[{"title":"Default Title","offer_id":42162400788559,"sku":"AG-SH","price":139.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/IMG_3397.jpg?v=1751981060"},{"product_id":"xlab-gorilla-bottle-cage","title":"XLAB Gorilla Bottle cage","description":"\u003cp\u003eThe perfect companion to the AeroGain BTA mounts\u003c\/p\u003e\n\u003cul class=\"BlackBullet\"\u003e\n\u003cli\u003e6 gripping fingers clasp onto bottles with approx 5 kg of grip force\u003c\/li\u003e\n\u003cli\u003eTall sides support large bottles so they don't eject from the BTA system\u003c\/li\u003e\n\u003cli\u003eEasy bottle insertion with specially designed interior\u003c\/li\u003e\n\u003cli\u003eNo more lost bottles when you choose the \u003cspan class=\"xlab\"\u003eGORILLA CAGE\u003c\/span\u003e!\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AeroGain","offers":[{"title":"Matt black","offer_id":43589726208079,"sku":"XLAB-G-1","price":74.9,"currency_code":"EUR","in_stock":true},{"title":"Gloss black","offer_id":43589726240847,"sku":"XLAB-G-2","price":74.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/Carbon-Gorilla.jpg?v=1750092955"},{"product_id":"tririg-kappa-saddle-cage","title":"Tririg Kappa Cage","description":"\u003cp class=\"MsoNormal\"\u003e\u003cspan\u003eThe perfect companion to the AeroGain BTA mounts\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan\u003eThe Trigrig Kappa, the strongest and most versatile bottle cage on the market, engineered specifically for triathletes. Designed with a singular goal—optimal grip strength—the Kappa Bottle Cage prevents bottle launches better than any other option, making it the perfect choice for demanding setups like BTA mounts and rear-mounted hydration systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eSuperior Grip Strength: Prevents bottle launches with a solid wrap-around design that maximizes grip.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003e3K Carbon Fiber Construction: Provides unmatched stiffness and durability for both road and triathlon setups.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eVersatile Use: Works seamlessly with the Beta rear-mounted carrier or any saddle-based setup, as well as front BTA setups.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eEasy Installation: Features spine relief slots for zip-tie mounting or bolt-on compatibility with standard BTA mounts.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AeroGain","offers":[{"title":"Default Title","offer_id":43709637918799,"sku":"TR-K","price":74.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/kappa-cage-tririg-1_jpg.webp?v=1760896267"},{"product_id":"tririg-kappa-cage-saddle","title":"Tririg Kappa Cage Saddle","description":"\u003cp class=\"MsoNormal\"\u003e\u003cspan\u003eThe perfect companion to the AeroGain BTA mounts\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan\u003eThe Kappa Saddle Cage is designed to offer superior bottle retention and convenience for the lower bottle on our BTA mounts, and behind-the-saddle hydration, making it the ultimate solution for triathletes and cyclists. Built upon the strengths of the original Kappa cage, the Kappa Saddle inverts the geometry for rear-mounted bottles, ensuring secure retention and easy access.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eRevolutionary Retention Design: The inverted retention tab provides the best bottle retention available for behind-the-saddle applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eEasy Bottle Access: The new tab position allows for easier bottle removal and replacement, perfect for on-the-go hydration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eUltra-Strong Construction: Thick walls and zip-tie mounting slots ensure solid and convenient mounting, while the no-cutout design guarantees strength.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e\u003cspan\u003eThe Kappa Saddle Cage eliminates the need for straps or cords and ensures that bottles stay secure over any terrain, providing a hassle-free hydration solution for serious athletes.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AeroGain","offers":[{"title":"Default Title","offer_id":43709658595407,"sku":"TR-KS","price":74.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/KappaSaddleBottleCage_01_jpg.webp?v=1760897426"},{"product_id":"xlab-gorilla-bottle-cage-copy","title":"XLAB Torpedo Reload Kit","description":"\u003cp data-start=\"0\" data-end=\"39\"\u003eBuilt for staying aero, not sitting up.\u003c\/p\u003e\n\u003cp data-start=\"41\" data-end=\"281\"\u003eThe XLAB Torpedo system is a proven BTA hydration setup designed to let you drink without breaking position. Positioned cleanly between your arms, it keeps airflow smooth while giving you constant, easy access to fluids during hard efforts.\u003c\/p\u003e\n\u003cp data-start=\"283\" data-end=\"585\"\u003eThe bottle and straw system is fully optimized for in-position use: you drink through the bite valve without lifting your head, and the leak-free design means no mess—whether you’re riding smooth tarmac or rough roads. Refilling is simple and can be done on the fly, so you stay focused on performance.\u003c\/p\u003e\n\u003cp data-start=\"587\" data-end=\"753\"\u003ePaired with our Double Bottle BTA system V2, it integrates neatly into a dual hydration setup—giving you both capacity and convenience without compromising aerodynamics.\u003c\/p\u003e\n\u003cp data-start=\"755\" data-end=\"832\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eA practical solution when you want to stay low, stay fast, and stay hydrated.\u003c\/p\u003e","brand":"AeroGain","offers":[{"title":"Default Title","offer_id":45159280345167,"sku":"XL-TR","price":89.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/torpedo-reload-kit-black_1.jpg?v=1777628852"},{"product_id":"aero-bts-pro-system","title":"Aero BTS PRO system","description":"\u003cp\u003eWhen Vincent Luis lined up at Ironman Texas with the Aero BTS PRO behind his saddle, race officials banned it on the spot. They hadn't seen anything like it. The system has since been reviewed and fully approved by World Triathlon and Ironman. The data didn't change.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1–2 W faster\u003c\/strong\u003e than the Aero BTS standard system — which is itself already 1–4 W faster than two bottles close together\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e900 ml of integrated storage\u003c\/strong\u003e — 100 ml more than the standard BTS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShell hugs the bottles\u003c\/strong\u003e — tighter profile, less exposed surface, smaller wake\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhite logo\u003c\/strong\u003e — designed to match the Aero Cockpit\u003c\/li\u003e\n\u003cli\u003eSaddle-specific carbon-tube build, ~350 g, holds 2 × 1000 ml bottles\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AeroGain","offers":[{"title":"Wove V8","offer_id":45399712825423,"sku":"AG-BTS-P-03","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Gebiomized Stride","offer_id":45399712858191,"sku":"AG-BTS-P-02","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Prologo T Galle TT","offer_id":45399712890959,"sku":"AG-BTS-P-10","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"ISM PN3.1","offer_id":45399712923727,"sku":"AG-BTS-P-01","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Specialized Sitero","offer_id":45399712956495,"sku":"AG-BTS-P-6","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Dash Integrated seat post","offer_id":45399712989263,"sku":"AG-BTS-P-8","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Selle Italia Watt Superflow","offer_id":45399713022031,"sku":"AG-BTS-P-5","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Fizik Transiro Aeris","offer_id":45399713054799,"sku":"AG-BTS-P-4","price":349.0,"currency_code":"EUR","in_stock":true},{"title":"PRO Stealth Team","offer_id":45444493869135,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/IMG_0735.jpg?v=1780297582"},{"product_id":"aero-bts-pro-cup","title":"Aero BTS PRO - cup","description":"\u003cp\u003eThe PRO cup unit on its own — for riders who already have an Aero BTS Carbon Saddle Clamp and want to add the PRO's 900 ml storage tray and tighter bottle shell.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e900 ml of integrated storage\u003c\/strong\u003e — 100 ml more than the standard cup\u003c\/li\u003e\n\u003cli\u003ePRO shell geometry — hugs the bottles for a tighter aero profile\u003c\/li\u003e\n\u003cli\u003eFits all Aero BTS Carbon Saddle Clamps\u003c\/li\u003e\n\u003cli\u003eHolds 2 × 1000 ml bottles in the wide V-formation\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eSaddle clamp not included. 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