{"product_id":"supersprox-front-sprocket-ktm-husqvarna-gasgas-cst-1901","title":"Supersprox - 520 Countershaft Sprocket - KTM, Husqvarna, GasGas","description":"\u003ch1\u003eSupersprox 520 Countershaft (Front) Sprocket for KTM, Husqvarna \u0026amp; GasGas\u003c\/h1\u003e\n\u003cp data-path-to-node=\"1\"\u003eThe Supersprox Countershaft Front Sprocket is a heavy-duty, high-precision replacement drive sprocket engineered specifically for full-size KTM, Husqvarna, and GASGAS motorcycles. Front countershaft sprockets undergo extreme mechanical stress, harsh mud abrasion, and severe shock loads during acceleration and downshifting. Factory sprockets often wear prematurely or lack self-cleaning provisions, leading to accelerated chain wear and tight spots.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003ePrecision CNC-machined from SCM-435 molybdenum alloy steel, this sprocket undergoes advanced case-hardening to deliver exceptional tooth longevity and wear resistance. Features include self-cleaning mud grooves etched into the base of the tooth valleys, which continuously clear packed dirt, sand, and chain lube buildup. This prevents chain tension spikes caused by packed debris, extending the service life of both your front sprocket and drive chain.\u003c\/p\u003e\n\u003ch4 data-path-to-node=\"3\"\u003eFeatures:\u003c\/h4\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eSCM-435 Alloy Steel:\u003c\/b\u003e CNC-machined from premium steel and case-hardened for maximum tensile strength and long service life.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eSelf-Cleaning Mud Grooves:\u003c\/b\u003e Etched tooth valley grooves prevent dirt, silt, and mud buildup from tightening the drive chain under harsh off-road conditions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003ePrecision Tooth Profile:\u003c\/b\u003e Computer-designed tooth geometry provides smooth chain engagement, reduced mechanical drag, and quiet operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003eMultiple Tooth Count Options:\u003c\/b\u003e Available in 12T, 13T, 14T, and 15T options to easily fine-tune your final drive gearing for technical single-track or high-speed dual-sport riding.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,4,0\"\u003e\u003cb data-path-to-node=\"4,4,0\" data-index-in-node=\"0\"\u003eFactory Fitment:\u003c\/b\u003e Exact spline tolerances match the OEM countershaft to prevent slop and splined shaft wear.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"5\"\u003eWhat's in the Box:\u003c\/h4\u003e\n\u003cul data-path-to-node=\"6\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,0,0\"\u003e1x Supersprox Countershaft Front Sprocket\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,1,0\"\u003e\u003ci data-path-to-node=\"6,1,0\" data-index-in-node=\"0\"\u003e(Note: Select your desired tooth count—12T, 13T, 14T, or 15T—from the variant dropdown menu before checkout).\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"7\"\u003eFitment:\u003c\/h4\u003e\n\u003cul data-path-to-node=\"8\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,0,0\"\u003e\u003cb data-path-to-node=\"8,0,0\" data-index-in-node=\"0\"\u003eAustrian Platform Fitment:\u003c\/b\u003e Fits most 2000–2026 full-size 125cc–500cc KTM, Husqvarna, and GASGAS models across SX, SX-F, XC, XC-F, XC-W, XCF-W, EXC-F, TE, FE, MC, and EC lineups.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"7\"\u003eFitment Notes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp data-path-to-node=\"12\"\u003e\u003cb data-path-to-node=\"12\" data-index-in-node=\"0\"\u003eCountershaft Dome Washer Warning:\u003c\/b\u003e When replacing your front sprocket, always inspect the cupped dome washer (Belleville washer) behind the countershaft bolt. The dome washer acts as a spring mechanism to keep tension on the sprocket and seal. Reusing a flattened, worn dome washer allows the sprocket to wobble micro-millimeters on the shaft, which will quickly fret and strip the splines on your expensive transmission countershaft. Always replace or properly torque the dome washer to factory spec with red STUCK NUTZ threadlocker. Typical torque of 60 Nm \/ 44 ft-lbs  \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13\"\u003e\u003cb data-path-to-node=\"13\" data-index-in-node=\"0\"\u003eGearing Ratio Dynamics:\u003c\/b\u003e Dropping one tooth on the front countershaft sprocket (e.g., from a 14T to a 13T) is equivalent to adding roughly 3 to 3.5 teeth to the rear sprocket. This lowers your overall gearing, bringing power on quicker for tight single-track and low-speed technical crawling. Conversely, going up to a 15T front sprocket lowers engine RPMs at cruising speeds, making it ideal for dual-sport or highway transfers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0622\/5720\/1317\/files\/MADE_IN_CZECHIA.jpg?v=1744046246\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e12T Part Number: \u003cmeta charset=\"utf-8\"\u003eCST-1901-12-4\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e13T Part Number: \u003cmeta charset=\"utf-8\"\u003eCST-1901-13-4\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e14T Part Number: \u003cmeta charset=\"utf-8\"\u003eCST-1901-14-4\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e15T Part Number: \u003cmeta charset=\"utf-8\"\u003eCST-1901-15-4\u003cbr\u003e26.10\u003cbr\u003e\u003cbr\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003e\u003c\/b\u003e\u003c\/p\u003e","brand":"Supersprox","offers":[{"title":"12T","offer_id":50890043162789,"sku":"SUPSPX-CS-FRT-KTM-HUS-12T","price":23.0,"currency_code":"USD","in_stock":true},{"title":"13T","offer_id":50890043195557,"sku":"SUPSPX-CS-FRT-KTM-HUS-13T","price":23.0,"currency_code":"USD","in_stock":false},{"title":"14T","offer_id":50890043228325,"sku":"SUPSPX-CS-FRT-KTM-HUS-14T","price":23.0,"currency_code":"USD","in_stock":false},{"title":"15T","offer_id":50890043261093,"sku":"SUPSPX-CS-FRT-KTM-HUS-15T","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/5720\/1317\/files\/Supersprox_Front_Countershaft_Sprocket_520.png?v=1792869364","url":"https:\/\/www.tmbrmoto.com\/products\/supersprox-front-sprocket-ktm-husqvarna-gasgas-cst-1901","provider":"TMBR MOTO","version":"1.0","type":"link"}