{"title":"Theory Parts","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0003\/3698\/6131\/files\/THEORY_BANNER.webp?v=1789801487\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThoery\u003c\/strong\u003e - from the minds behind the \u003cstrong\u003eMerritt\u003c\/strong\u003e and \u003cstrong\u003eRixin\u003c\/strong\u003e brands -  specialise in s\u003cspan class=\"s1\"\u003eimple and durable bike parts for BMX and Bikelife cimmunities that provide great performance at a lower budget. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","products":[{"product_id":"theory-american-bottom-bracket-cups","title":"Theory American Bottom Bracket Cups","description":"\u003cp\u003e\u003cstrong\u003eColoured CNC American bottom bracket cups, for a colour change, or if you have a Mid BB you can convert it to American with these cups.  \u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e• CNC machined.\u003c\/p\u003e\n\u003cp\u003e• Wide choice of colours.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Theory","offers":[{"title":"Black","offer_id":56780317884802,"sku":"BOTTH4500BLAAM","price":15.99,"currency_code":"GBP","in_stock":true},{"title":"Blue","offer_id":56780323062146,"sku":"BOTTH4500BLUAM","price":15.99,"currency_code":"GBP","in_stock":true},{"title":"Dark Blue","offer_id":56780323127682,"sku":"BOTTH4500DBLAM","price":15.99,"currency_code":"GBP","in_stock":true},{"title":"Gold","offer_id":56780323193218,"sku":"BOTTH4500GOLAM","price":15.99,"currency_code":"GBP","in_stock":true},{"title":"Pink","offer_id":56780323258754,"sku":"BOTTH4500PINAM","price":15.99,"currency_code":"GBP","in_stock":true},{"title":"Polished","offer_id":56780317950338,"sku":"BOTTH4500POLAM","price":15.99,"currency_code":"GBP","in_stock":false},{"title":"Red","offer_id":56780323324290,"sku":"BOTTH4500REDAM","price":15.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3698\/6131\/files\/theory-american-bottom-bracket-cups-bmx-parts-alansbmx-1256964662.jpg?v=1788451971"},{"product_id":"theory-euro-bottom-bracket","title":"Theory Euro Bottom Bracket","description":"\u003cdiv class=\"product__description rte\"\u003e\u003cstrong\u003eThe Theory Euro BB kit includes 2 threaded aluminum cups with 2 sealed bearings in each cup and internal tube spacer. Great replacement for your SE Bike and others that use a threaded BB. Select for 19mm or 22mm crank spindle.\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"product__description rte\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product__description rte\"\u003e\u003cspan\u003e19 or 22mm.\u003cbr\u003eBlack, Blue, Silver or Red.\u003c\/span\u003e\u003c\/div\u003e","brand":"Theory","offers":[{"title":"Black \/ 19mm","offer_id":56792198283650,"sku":"BBOTH002BK19","price":45.99,"currency_code":"GBP","in_stock":false},{"title":"Black \/ 22mm","offer_id":56792198316418,"sku":"BBOTH002BK22","price":45.99,"currency_code":"GBP","in_stock":false},{"title":"Blue \/ 19mm","offer_id":56792198349186,"sku":"BBOTH002BL19","price":45.99,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 22mm","offer_id":56792198381954,"sku":"BBOTH002BL22","price":45.99,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 19mm","offer_id":56792229839234,"sku":"BBOTH002RD19","price":45.99,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 22mm","offer_id":56792229872002,"sku":"BBOTH002RD22","price":45.99,"currency_code":"GBP","in_stock":true},{"title":"Silver \/ 19mm","offer_id":56792229904770,"sku":"BBOTH002SV19","price":45.99,"currency_code":"GBP","in_stock":true},{"title":"Silver \/ 22mm","offer_id":56792229937538,"sku":"BBOTH002SV22","price":45.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3698\/6131\/files\/theory-euro-bottom-bracket-bmx-parts-alansbmx-1256964661.jpg?v=1788451849"},{"product_id":"theory-410-coloured-bmx-chain-100l","title":"Theory 410 Coloured BMX Chain 100L","description":"\u003cdiv class=\"product__description rte\"\u003e\n\u003cspan\u003e\u003cstrong\u003eTheory classic 1\/8\" chain for BMX and other single speed bikes, 110 link, in a ton of colours to match your setup. \u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eSpec\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e110 Links\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1\/2\" x 1\/8\" inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eHigh-strength HiTen steel\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtras:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncludes joining link\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Theory","offers":[{"title":"Black","offer_id":56811640783234,"sku":"CHATH1000BLA","price":13.99,"currency_code":"GBP","in_stock":true},{"title":"Blue","offer_id":56811640816002,"sku":"CHATH1000BLU","price":13.99,"currency_code":"GBP","in_stock":true},{"title":"Gold","offer_id":56811640848770,"sku":"CHATH1000GOL","price":13.99,"currency_code":"GBP","in_stock":true},{"title":"Pink","offer_id":56811648844162,"sku":"CHATH1000PIN","price":13.99,"currency_code":"GBP","in_stock":true},{"title":"Purple","offer_id":56811640947074,"sku":"CHATH1000PUR","price":13.99,"currency_code":"GBP","in_stock":true},{"title":"Red","offer_id":56811640979842,"sku":"CHATH1000RED","price":13.99,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":56811641012610,"sku":"CHATH1000WHI","price":13.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3698\/6131\/files\/theory-410-coloured-bmx-chain-100l-bmx-parts-alansbmx-1256949299.jpg?v=1788444689"},{"product_id":"theory-conserve-cranks","title":"Theory Conserve Cranks","description":"\u003cp\u003e\u003cstrong\u003eTheory 3 piece design with chromoly arms. RH compatibility only. Comes with 19mm 8 Spline Spindle. Bearings not included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSpindle length is 138mm, 155mm or 175mm. 138mm is standard BMX width. \u003c\/p\u003e\n\u003cp\u003eSome Fat tire bikes like a Fat Ripper require a\u003cspan\u003e \u003c\/span\u003e210mm spindle\u003cspan\u003e \u003c\/span\u003e(sold separately)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat Arm Length do I need?\u003c\/strong\u003e\u003cbr\u003eTo an extent, it's personal preference. Traditionally, BMX cranks have been 175mm, but this evolved from BMX racing. Since the advent of park and for street riding, especially for riders running pegs, shorter arm lengths like 160 and 165mm have become popular. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat Bottom Bracket do I need?\u003c\/strong\u003e\u003cbr\u003eCranks nowadays usually don't come with bottom bracket bearings - this is so you can select the BB you need for your frame. You need two pieces of information when ordering a BB - the crank's spindle size - in this case \u003cstrong\u003e19mm\u003c\/strong\u003e and the BB size of your frame - see image below showing the types. \u003cstrong\u003e\u003ca title=\"BMX Bottom Brackets\" href=\"https:\/\/alansbmx.com\/collections\/bmx-bottom-brackets\"\u003eChoose your BB here.\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitting\u003c\/strong\u003e\u003cbr\u003eDon't forget to use grease in your bearings and your pedal threads when installing cranks. See our note about \u003ca title=\"Pedal Fitment\" href=\"https:\/\/alansbmx.com\/collections\/pedal-fitment\"\u003e\u003cstrong\u003epedal fitment here.\u003c\/strong\u003e\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Theory","offers":[{"title":"Black \/ 170mm \/ 138mm","offer_id":56811661787522,"sku":"CRATH3000170BLA","price":64.99,"currency_code":"GBP","in_stock":true},{"title":"Black \/ 175mm \/ 138mm","offer_id":56811659788674,"sku":"CRATH3000175BLA","price":64.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3698\/6131\/files\/theory-conserve-cranks-bmx-parts-alansbmx-1256949304.jpg?v=1788444569"},{"product_id":"theory-verify-sprocket","title":"Theory Verify Sprocket","description":"\u003cdiv class=\"product__description rte\"\u003e\n\u003cp\u003e\u003cstrong\u003eThe Verify sprocket from Theory is simple and effective 6061 aluminum sprocket that won't break the bank. 24mm bore and includes adapters for 19mm and 22mm spindles. 1\/8\" teeth. Perfect upgrade for the easily-bent steel sprockets that come on many complete bikes. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e• 6061 aluminium.\u003cbr\u003e• 25T or 28T.\u003cbr\u003e• 24mm bore with 19 \u0026amp; 22mm adaptors.\u003cbr\u003e• Colours: Black, gold, blue, silver, purple, red.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e25 or 28T?\u003c\/strong\u003e\u003cbr\u003e25 teeth is standard now on most \"freestyle\" bikes. If you change to a 28T you will have more speed, most Pros run a 28T or larger (with 9T rear). \u003cstrong\u003eNOTE: You might need more links in your chain if you change from 25 to 28 teeth. \u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Theory","offers":[{"title":"Black \/ 25T","offer_id":56883162939778,"sku":"SPRTH100025BLA","price":21.99,"currency_code":"GBP","in_stock":true},{"title":"Black \/ 28T","offer_id":56883163136386,"sku":"SPRTH100028BLA","price":21.99,"currency_code":"GBP","in_stock":false},{"title":"Blue \/ 25T","offer_id":56883196199298,"sku":"SPRTH100025BLU","price":21.99,"currency_code":"GBP","in_stock":true},{"title":"Blue \/ 28T","offer_id":56883196232066,"sku":"SPRTH100028BLU","price":21.99,"currency_code":"GBP","in_stock":false},{"title":"Gold \/ 25T","offer_id":56883162972546,"sku":"SPRTH100025GOL","price":21.99,"currency_code":"GBP","in_stock":true},{"title":"Gold \/ 28T","offer_id":56883163169154,"sku":"SPRTH100028GOL","price":21.99,"currency_code":"GBP","in_stock":false},{"title":"Purple \/ 25T","offer_id":56883163038082,"sku":"SPRTH100025PUR","price":21.99,"currency_code":"GBP","in_stock":false},{"title":"Purple \/ 28T","offer_id":56883163234690,"sku":"SPRTH100028PUR","price":21.99,"currency_code":"GBP","in_stock":false},{"title":"Red \/ 25T","offer_id":56883163070850,"sku":"SPRTH100025RED","price":21.99,"currency_code":"GBP","in_stock":true},{"title":"Red \/ 28T","offer_id":56883163267458,"sku":"SPRTH100028RED","price":21.99,"currency_code":"GBP","in_stock":false},{"title":"Silver \/ 25T","offer_id":56883163005314,"sku":"SPRTH100025SIL","price":21.99,"currency_code":"GBP","in_stock":true},{"title":"Silver \/ 28T","offer_id":56883163201922,"sku":"SPRTH100028SIL","price":21.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3698\/6131\/files\/theory-verify-sprocket-bmx-parts-alansbmx-1257403035.jpg?v=1788804613"}],"url":"https:\/\/alansbmx.com\/collections\/theory-parts.oembed","provider":"Alans BMX","version":"1.0","type":"link"}