{"product_id":"brother-cycles-big-bro-frameset","title":"Brother Cycles Big Bro Adventure Frameset","description":"\u003cdiv style=\"font-family: 'Work Sans', sans-serif; font-size: 16px; line-height: 1.5; color: #1a1a1a; max-width: 100%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eA tough-as-nails 29er and 27.5+ steel adventure frame, from bikepacking races to round-the-world touring.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Big Bro is built for going a long way off the beaten track. Run it light for a bikepacking race, load it with front and rear panniers for a big tour, or strip it back for the trails. It has finished the Tour Divide and the Silk Road Mountain Race, and it will handle the North Downs Way without noticing.\u003c\/p\u003e\n\u003cp\u003eThe latest version uses heat treated 4130 chromoly, new rail-style sliding dropouts for a stronger rear end, a SRAM UDH hanger that takes Full Mount derailleurs, top tube bag mounts and extra rack mounts on the fork. Boost spacing clears 29 x 2.6 inch or 27.5 x 3 inch tyres. Brother's next batch of Big Bros is due in November 2026.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy we chose this for our customers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; margin-bottom: 25px;\"\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eGo anywhere:\u003c\/strong\u003e 29 x 2.6 inch or 27.5 x 3 inch tyres on Boost spacing\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eGeared, single speed or Rohloff:\u003c\/strong\u003e sliding dropouts, with a Rohloff dropout kit available\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eMounts everywhere:\u003c\/strong\u003e triple mounts on and under the down tube, on the fork legs, top tube bag mounts and rack mounts\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eModern standards:\u003c\/strong\u003e UDH hanger, stealth dropper routing, 44mm head tube\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eProven:\u003c\/strong\u003e tested on the South Downs, Snowdonia and the Highlands, then raced across continents\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; margin-bottom: 25px;\"\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eFrame: heat treated 4130 chromoly, double butted main triangle, ED coated\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eFork: 4130 chromoly tapered unicrown, 100mm suspension corrected, 15x110mm Boost thru axle included\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eRear: Boost 12x148mm thru axle included, sliding rail dropouts, SRAM UDH hanger\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eBrakes: 51mm IS disc mount, 180mm max rotor\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eTyre clearance: 29 x 2.6 inch or 27.5 x 3.0 inch\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eSeatpost: 30.9mm, stealth dropper routing, 33.1mm seat clamp included\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eHeadset: ZS44\/28.6 upper, EC44\/40 lower (not included)\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eBottom bracket: 73mm ISO threaded\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eChainrings: 48-36-26t triple, 44-30t double, 38t single\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eWeight: 2.60kg frame (medium), 1.37kg fork\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003eTested to ISO 4210 MTB standard, three year frame guarantee from Brother Cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGeometry\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 25px;\"\u003e\n\u003ctable style=\"width: 100%; min-width: 520px; font-size: 14px;\"\u003e\n\u003cthead style=\"background: #1B4F72; color: #ffffff;\"\u003e\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eS (16)\u003c\/th\u003e\n\u003cth\u003eM (18)\u003c\/th\u003e\n\u003cth\u003eL (20)\u003c\/th\u003e\n\u003cth\u003eXL (22)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat tube (C-T)\u003c\/td\u003e\n\u003ctd\u003e406\u003c\/td\u003e\n\u003ctd\u003e457\u003c\/td\u003e\n\u003ctd\u003e508\u003c\/td\u003e\n\u003ctd\u003e559\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEffective top tube\u003c\/td\u003e\n\u003ctd\u003e575\u003c\/td\u003e\n\u003ctd\u003e595\u003c\/td\u003e\n\u003ctd\u003e620\u003c\/td\u003e\n\u003ctd\u003e645\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead tube\u003c\/td\u003e\n\u003ctd\u003e95\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead angle\u003c\/td\u003e\n\u003ctd\u003e69.5\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e70.5\u003c\/td\u003e\n\u003ctd\u003e70.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeat angle\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChainstay (min)\u003c\/td\u003e\n\u003ctd\u003e445\u003c\/td\u003e\n\u003ctd\u003e445\u003c\/td\u003e\n\u003ctd\u003e445\u003c\/td\u003e\n\u003ctd\u003e445\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStack\u003c\/td\u003e\n\u003ctd\u003e598\u003c\/td\u003e\n\u003ctd\u003e605\u003c\/td\u003e\n\u003ctd\u003e616\u003c\/td\u003e\n\u003ctd\u003e630\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReach\u003c\/td\u003e\n\u003ctd\u003e392\u003c\/td\u003e\n\u003ctd\u003e410\u003c\/td\u003e\n\u003ctd\u003e432\u003c\/td\u003e\n\u003ctd\u003e452\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWheelbase\u003c\/td\u003e\n\u003ctd\u003e1083\u003c\/td\u003e\n\u003ctd\u003e1098\u003c\/td\u003e\n\u003ctd\u003e1118\u003c\/td\u003e\n\u003ctd\u003e1144\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 14px;\"\u003eAll measurements in mm and degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eIdeal for:\u003c\/strong\u003e bikepackers, expedition tourers and riders who want one tough steel mountain bike that can carry everything.\u003c\/p\u003e\n\u003cp\u003eBrother design their frames in London and we build them up on the bench in Bow, a few miles across East London. Bring us a parts list, a pile of components you already own, or just an idea, and we will spec, build and fit it for you. See the full \u003ca href=\"\/collections\/brother-cycles\"\u003eBrother Cycles range\u003c\/a\u003e, our other \u003ca href=\"\/collections\/framesets\"\u003eframesets\u003c\/a\u003e, or book a build through \u003ca href=\"\/pages\/bike-repair-east-london\"\u003eour workshop\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Brother Cycles","offers":[{"title":"Swamp Thing \/ Small","offer_id":55203083714899,"sku":"BRO-BIGBRO-ST-S","price":949.0,"currency_code":"GBP","in_stock":false},{"title":"Swamp Thing \/ Medium","offer_id":55203083747667,"sku":"BRO-BIGBRO-ST-M","price":949.0,"currency_code":"GBP","in_stock":false},{"title":"Swamp Thing \/ Large","offer_id":55203083780435,"sku":"BRO-BIGBRO-ST-L","price":949.0,"currency_code":"GBP","in_stock":false},{"title":"Swamp Thing \/ X-Large","offer_id":55203083813203,"sku":"BRO-BIGBRO-ST-XL","price":949.0,"currency_code":"GBP","in_stock":false},{"title":"Stealth Black \/ Small","offer_id":55203083845971,"sku":"BRO-BIGBRO-SB-S","price":949.0,"currency_code":"GBP","in_stock":true},{"title":"Stealth Black \/ Medium","offer_id":55203083878739,"sku":"BRO-BIGBRO-SB-M","price":949.0,"currency_code":"GBP","in_stock":false},{"title":"Stealth Black \/ Large","offer_id":55203083911507,"sku":"BRO-BIGBRO-SB-L","price":949.0,"currency_code":"GBP","in_stock":false},{"title":"Stealth Black \/ X-Large","offer_id":55203083944275,"sku":"BRO-BIGBRO-SB-XL","price":949.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1089\/7283\/5155\/files\/swamp1.jpg?v=1791144941","url":"https:\/\/www.aztecsbikes.com\/products\/brother-cycles-big-bro-frameset","provider":"Aztecs Bikes","version":"1.0","type":"link"}