{"product_id":"marin-alcatraz-2-frameset-purple-fade","title":"Marin Alcatraz 2 Dirt Jump Frameset (Purple Fade)","description":"\u003cp style=\"text-align:center;font-style:italic;font-size:18px;border:1px solid #ddd;background:#f7f7f7;padding:16px;\"\u003eA 26-inch single-speed frameset for the rider who wants to build a dedicated dirt jump or pump-track bike, light and simple enough to throw around on poppy manuals and big sends without a drivetrain to worry about.\u003c\/p\u003e\u003ch5\u003eOverview\u003c\/h5\u003e\u003cp\u003eThe Alcatraz 2 frameset is built around a Series 3 6061 aluminium frame designed specifically for dirt jump and park riding - short chainstays, a low stack, and horizontal rear dropouts that let you tension a single-speed chain by sliding the rear wheel rather than relying on a derailleur or tensioner cage alone. It's sold as a frame plus the small parts that are frame-specific rather than swappable build choices: the FSA No 57E headset and the Marin MTB bolt-type seat clamp both come included.\u003c\/p\u003e\u003cp\u003eThe frame takes a 73mm threaded bottom bracket with ISCG 05 tabs for a chain guide, and its 135x10mm horizontal rear dropout is built around single-speed use, with a Marin chain tension device keeping things snug without a derailleur. Internal cable routing is ambidextrous, so the rear brake line can be run on either side of the bars depending on how you set up your cockpit. Marin's own complete-build equivalent pairs this frame with a 100mm-travel coil fork and a single 32T chainring on a 104mm BCD, giving a sense of the build this frame is designed around.\u003c\/p\u003e\u003cp\u003eThis is the frameset for a rider who already knows they want a dedicated 26-inch dirt jump or pump-track bike and would rather choose their own fork, wheels and cockpit than buy a complete build.\u003c\/p\u003e\u003ch5\u003eWhy You'll Like It\u003c\/h5\u003e\u003cp\u003e\u003cstrong\u003eBuilt around single-speed simplicity\u003c\/strong\u003e\u003cbr\u003eThe horizontal rear dropout and included chain tension device mean you can run a true single-speed drivetrain with simple chain-line tensioning, with no derailleur hanger to protect or bend.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHeadset and seat clamp already sorted\u003c\/strong\u003e\u003cbr\u003eThe FSA No 57E headset and Marin MTB bolt-type seat clamp both come with the frame, so you're not sourcing frame-specific small parts separately before you can even start the build.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRouting that adapts to your cockpit\u003c\/strong\u003e\u003cbr\u003eAmbidextrous internal cable routing lets the rear brake line run on either side of the bars, so you can set the bike up moto-style or regular without being locked into one routing direction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA chain guide ready to go\u003c\/strong\u003e\u003cbr\u003eISCG 05 tabs mean a chain guide can be bolted straight on, which matters more on a dirt jump or park bike than almost any other riding style.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTwo sizes for different-height riders\u003c\/strong\u003e\u003cbr\u003eShort and Long options keep the geometry proportionate across a real range of rider heights, rather than forcing everyone onto one compromise frame size.\u003c\/p\u003e\u003ch5\u003eWho Is It For?\u003c\/h5\u003e\u003cp\u003eThe Alcatraz 2 frameset is for a rider who's set on building a dedicated dirt jump or pump-track bike and wants to choose their own fork, wheels, bar and cockpit rather than take a complete build's spec as given. It suits someone upgrading from a complete dirt jump bike who wants to keep a favourite fork or wheelset while refreshing the frame.\u003c\/p\u003e\u003cp\u003eIn India, that fits riders at the handful of dedicated pump tracks and dirt jump spots now appearing around the bigger cities, as well as BMX and freestyle riders looking for a 26-inch platform with modern mountain-bike sizing rather than a true BMX frame.\u003c\/p\u003e\u003ch5\u003eGood to Know\u003c\/h5\u003e\u003cp\u003eBecause the headset and seat clamp are already included, the remaining build list is mostly fork, wheels, bars, stem, cranks, chainring and brake - plan your parts list around those. The ISCG 05 tabs mean a chain guide is a simple bolt-on addition whenever you want one, rather than a frame-dependent upgrade.\u003c\/p\u003e\u003ch5\u003eTechnical Specifications\u003c\/h5\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Year\u003c\/strong\u003e: 2026\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame Material\u003c\/strong\u003e: Series 3 6061 aluminium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFork Material\u003c\/strong\u003e: N\/A - sold as frame-only; fork not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFork Construction\u003c\/strong\u003e: N\/A - fork not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDropout Style\u003c\/strong\u003e: 135x10mm horizontal rear dropout (single-speed chain tensioning)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrake Type\u003c\/strong\u003e: Disc (complete-build equivalent uses Shimano MT201 hydraulic disc, 160mm rotors front and rear)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeadset Included\u003c\/strong\u003e: Yes - FSA No 57E, semi-sealed cartridge bearings, 1 1\/8\" x 1 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeadtube Diameter\u003c\/strong\u003e: Tapered 1 1\/8\" x 1 1\/2\" (matches included headset)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeatpost Included\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeatpost Diameter\u003c\/strong\u003e: 30.9mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeatpost Clamp Included\u003c\/strong\u003e: Yes - Marin MTB Seat Clamp, bolt type\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront Derailleur Mount\u003c\/strong\u003e: N\/A - single-speed frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront Derailleur Type\u003c\/strong\u003e: N\/A - single-speed frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom Bracket Type\u003c\/strong\u003e: Threaded, 73mm shell, external sealed cartridge bearings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBB Shell Width\u003c\/strong\u003e: 73mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Routing\u003c\/strong\u003e: Internal, ambidextrous (rear brake can run either side)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDi2 Compatible\u003c\/strong\u003e: No - single-speed frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHub Spacing\u003c\/strong\u003e: Rear 135x10mm; front 110x20mm (per complete-build fork)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Chainring\u003c\/strong\u003e: 32T (104mm BCD, per complete-build spec)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain Guide Mounts\u003c\/strong\u003e: ISCG 05 tabs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel Size\u003c\/strong\u003e: 26\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch5\u003eAdditional Information\u003c\/h5\u003e\u003cul\u003e\n\u003cli\u003eCountry of Origin: China\u003c\/li\u003e\n\u003cli\u003eImported By: Ciclo Essentials Private Limited, B-55A, Sahakar Marg, Jaipur - 302005, India.\u003c\/li\u003e\n\u003cli\u003eNet Quantity: 1N\u003c\/li\u003e\n\u003cli\u003eCustomer Care Address: 291, 10 Main, 5 Block, Jayanagar, Bangalore - 560041. Ph: (080)47183232, Email: support@bumsonthesaddle.com\u003c\/li\u003e\n\u003cli\u003eCommodity: Framesets\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ciclo Essentials","offers":[{"title":"Long","offer_id":51231254315177,"sku":"74154402-L","price":38999.0,"currency_code":"INR","in_stock":false},{"title":"Short","offer_id":51231254347945,"sku":"741544001-s","price":38999.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/7793\/files\/Marin_Bikes_Alcatraz_Framekit.png?v=1792072178","url":"https:\/\/bumsonthesaddle.com\/products\/marin-alcatraz-2-frameset-purple-fade","provider":"BUMSONTHESADDLE","version":"1.0","type":"link"}