{"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 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Each variant is tooled to the exact rail geometry of a specific saddle model — not a universal adapter — so it sits securely and stays in position under race loads.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentral carbon rod\u003c\/strong\u003e — maximum stiffness, minimal flex from start to finish\u003c\/li\u003e\n\u003cli\u003eSaddle-specific moulding — tooled to your saddle's rail geometry\u003c\/li\u003e\n\u003cli\u003eCompatible with both the Aero BTS cup and the Aero BTS PRO cup\u003c\/li\u003e\n\u003cli\u003eAvailable for 8 saddle models — select below\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AeroGain","offers":[{"title":"ISM PN3.1","offer_id":45307792425039,"sku":"AG-BTS-CL-1","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Gebiomized Stride","offer_id":45307792457807,"sku":"AG-BTS-CL-2","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Wove V8","offer_id":45307792490575,"sku":"AG-BTS-CL-3","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Fizik Transiro Aeris","offer_id":45307792523343,"sku":"AG-BTS-CL-4","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Selle Italia Watt Superflow","offer_id":45307792556111,"sku":"AG-BTS-CL-9","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Selle Italia Watt Superflow 3D","offer_id":45518128283727,"sku":"AG-BTS-CL-12","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Specialized Sitero","offer_id":45307792588879,"sku":"AG-BTS-CL-6","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Pologo T Galle TT CPC","offer_id":45307792621647,"sku":"AG-BTS-CL-10","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Prologo Dimension CPC Nack 143","offer_id":45480486273103,"sku":"AG-BTS-CL-11","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Dash Integrated Seatpost","offer_id":45307792654415,"sku":"AG-BTS-CL-8","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"Pro Stealth Team","offer_id":45444486037583,"sku":"AG-BTS-CL-14","price":149.95,"currency_code":"EUR","in_stock":true},{"title":"PRO Aerofuel","offer_id":45518128316495,"sku":"AG-BTS-CL-13","price":149.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/7657\/1215\/files\/AG-BTS-CL-12.png?v=1781539291"},{"product_id":"aero-bts-double-bottle-mount","title":"Aero BTS cup","description":"\u003cp\u003eThe standard Aero BTS cup on its own — for riders who already have an Aero BTS Carbon Saddle Clamp and want a replacement cup or the lighter alternative to the PRO.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e800 ml of integrated storage\u003c\/strong\u003e — inner tubes, CO2, tools, tyre lever\u003c\/li\u003e\n\u003cli\u003eWide V-formation — same bottle positions as the PRO cup\u003c\/li\u003e\n\u003cli\u003e60 g lighter than the PRO cup\u003c\/li\u003e\n\u003cli\u003eFits all Aero BTS Carbon Saddle Clamps\u003c\/li\u003e\n\u003cli\u003eHolds 2 × 1000 ml bottles\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eSaddle clamp not included. 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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":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Gebiomized Stride","offer_id":45399712858191,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Prologo T Galle TT","offer_id":45399712890959,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"ISM PN3.1","offer_id":45399712923727,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Specialized Sitero","offer_id":45399712956495,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Dash Integrated seat post","offer_id":45399712989263,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Selle Italia Watt Superflow","offer_id":45399713022031,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Fizik Transiro Aeris","offer_id":45399713054799,"sku":null,"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},{"title":"Prologo Dimension CPC Nack 143","offer_id":45480922841167,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"PRO Aerofuel","offer_id":45518088339535,"sku":null,"price":349.0,"currency_code":"EUR","in_stock":true},{"title":"Selle Italia Watt Superflow 3D Carbon","offer_id":45808358916175,"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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