{"product_id":"shimano-csm9100-sprocket-unit-10-12t-1","title":"Shimano Csm9100 Sprocket Unit [10-12T]","description":"\u003ch2 data-end=\"42\" data-section-id=\"1cx03c7\" data-start=\"0\"\u003eShimano CS-M9100 Sprocket Unit (10–12T)\u003c\/h2\u003e\r\n\r\n\u003ch3 data-end=\"59\" data-section-id=\"c32iwk\" data-start=\"44\"\u003eWhat Is It?\u003c\/h3\u003e\r\n\r\n\u003cp data-end=\"373\" data-start=\"60\"\u003eThe Shimano CS-M9100 Sprocket Unit is an \u003cstrong data-end=\"139\" data-start=\"101\"\u003eoriginal replacement small-cog set\u003c\/strong\u003e for Shimano 12-speed MTB cassettes. It includes the \u003cstrong data-end=\"217\" data-start=\"192\"\u003e10T and 12T sprockets\u003c\/strong\u003e, which are the smallest gears on modern wide-range MTB cassettes like the XTR, XT, SLX, and Deore 12-speed systems.\u003c\/p\u003e\r\n\r\n\u003cp data-end=\"502\" data-start=\"375\"\u003eIt’s used when the smallest cogs are worn out (which often happens first because they handle the highest chain load and speed).\u003c\/p\u003e\r\n\r\n\u003chr data-end=\"507\" data-start=\"504\"\u003e\r\n\u003ch3 data-end=\"525\" data-section-id=\"1iz91iu\" data-start=\"509\"\u003eKey Features\u003c\/h3\u003e\r\n\r\n\u003cul data-end=\"824\" data-start=\"526\"\u003e\r\n\t\u003cli data-end=\"573\" data-section-id=\"16thmxl\" data-start=\"526\"\u003eReplacement \u003cstrong data-end=\"573\" data-start=\"540\"\u003e10T + 12T steel sprocket pair\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"619\" data-section-id=\"1c3whz0\" data-start=\"574\"\u003eDesigned for Shimano 12-speed MTB cassettes\u003c\/li\u003e\r\n\t\u003cli data-end=\"667\" data-section-id=\"1tsk3qv\" data-start=\"620\"\u003eOEM Shimano part for precise fit and shifting\u003c\/li\u003e\r\n\t\u003cli data-end=\"729\" data-section-id=\"1j4bi5j\" data-start=\"668\"\u003eUsed in wide-range cassettes like 10–45T and 10–51T systems\u003c\/li\u003e\r\n\t\u003cli data-end=\"824\" data-section-id=\"6zesyk\" data-start=\"730\"\u003eHigh-strength steel construction for wear resistance\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"829\" data-start=\"826\"\u003e\r\n\u003ch3 data-end=\"849\" data-section-id=\"1yl5694\" data-start=\"831\"\u003eSpecifications\u003c\/h3\u003e\r\n\r\n\u003cul data-end=\"1217\" data-start=\"850\"\u003e\r\n\t\u003cli data-end=\"894\" data-section-id=\"cwafzr\" data-start=\"850\"\u003eType: Cassette sprocket replacement unit\u003c\/li\u003e\r\n\t\u003cli data-end=\"915\" data-section-id=\"1gflgoj\" data-start=\"895\"\u003eTeeth: 10T + 12T\u003c\/li\u003e\r\n\t\u003cli data-end=\"939\" data-section-id=\"7wmqiv\" data-start=\"916\"\u003eSpeed: 12-speed MTB\u003c\/li\u003e\r\n\t\u003cli data-end=\"1091\" data-section-id=\"1ldg31p\" data-start=\"940\"\u003eCompatibility:\r\n\t\u003cul data-end=\"1091\" data-start=\"959\"\u003e\r\n\t\t\u003cli data-end=\"980\" data-section-id=\"tdz3xo\" data-start=\"959\"\u003eShimano XTR M9100\u003c\/li\u003e\r\n\t\t\u003cli data-end=\"1003\" data-section-id=\"1e0z8qn\" data-start=\"983\"\u003eShimano XT M8100\u003c\/li\u003e\r\n\t\t\u003cli data-end=\"1027\" data-section-id=\"10msnwb\" data-start=\"1006\"\u003eShimano SLX M7100\u003c\/li\u003e\r\n\t\t\u003cli data-end=\"1091\" data-section-id=\"1dzqm61\" data-start=\"1030\"\u003eShimano Deore M6100\u003c\/li\u003e\r\n\t\u003c\/ul\u003e\r\n\t\u003c\/li\u003e\r\n\t\u003cli data-end=\"1120\" data-section-id=\"p9xk3r\" data-start=\"1092\"\u003eMaterial: Hardened steel\u003c\/li\u003e\r\n\t\u003cli data-end=\"1164\" data-section-id=\"pgqu9\" data-start=\"1121\"\u003ePosition: Smallest two cogs on cassette\u003c\/li\u003e\r\n\t\u003cli data-end=\"1191\" data-section-id=\"10i7ocx\" data-start=\"1165\"\u003ePart number: Y1X498020\u003c\/li\u003e\r\n\t\u003cli data-end=\"1217\" data-section-id=\"1rstfrq\" data-start=\"1192\"\u003eWeight: ~20–25 g (pair)\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"1222\" data-start=\"1219\"\u003e\r\n\u003ch3 data-end=\"1232\" data-section-id=\"yntdlk\" data-start=\"1224\"\u003ePros\u003c\/h3\u003e\r\n\r\n\u003cp data-end=\"1490\" data-start=\"1233\"\u003e✔ Genuine Shimano OEM replacement part (perfect compatibility)\u003cbr data-end=\"1298\" data-start=\"1295\"\u003e\r\n✔ Much cheaper than replacing the full cassette\u003cbr data-end=\"1348\" data-start=\"1345\"\u003e\r\n✔ Restores crisp shifting in worn high gears\u003cbr data-end=\"1395\" data-start=\"1392\"\u003e\r\n✔ High durability steel construction\u003cbr data-end=\"1434\" data-start=\"1431\"\u003e\r\n✔ Ideal for riders who frequently use the 10T sprocket\u003c\/p\u003e\r\n\r\n\u003chr data-end=\"1495\" data-start=\"1492\"\u003e\r\n\u003ch3 data-end=\"1505\" data-section-id=\"yncdlj\" data-start=\"1497\"\u003eCons\u003c\/h3\u003e\r\n\r\n\u003cp data-end=\"1773\" data-start=\"1506\"\u003e✖ Only fixes the smallest two cogs — not full cassette wear\u003cbr data-end=\"1568\" data-start=\"1565\"\u003e\r\n✖ Can be nearly half the price of budget cassettes (value depends on wear level)\u003cbr data-end=\"1651\" data-start=\"1648\"\u003e\r\n✖ Requires cassette disassembly tools and correct reassembly\u003cbr data-end=\"1714\" data-start=\"1711\"\u003e\r\n✖ Not always widely stocked (can be harder to find locally)\u003c\/p\u003e\r\n\r\n\u003chr data-end=\"1778\" data-start=\"1775\"\u003e\r\n\u003ch3 data-end=\"1807\" data-section-id=\"lom3wk\" data-start=\"1780\"\u003eWho Is It Suitable For?\u003c\/h3\u003e\r\n\r\n\u003cul data-end=\"2052\" data-start=\"1808\"\u003e\r\n\t\u003cli data-end=\"1859\" data-section-id=\"1fwrdmu\" data-start=\"1808\"\u003eRiders running Shimano 12-speed MTB drivetrains\u003c\/li\u003e\r\n\t\u003cli data-end=\"1914\" data-section-id=\"1kkya6a\" data-start=\"1860\"\u003eXC and trail riders who use high-speed gears often\u003c\/li\u003e\r\n\t\u003cli data-end=\"1998\" data-section-id=\"a8thoo\" data-start=\"1915\"\u003eRiders who have worn out the 10T\/12T but the rest of the cassette is still good\u003c\/li\u003e\r\n\t\u003cli data-end=\"2052\" data-section-id=\"1dyed66\" data-start=\"1999\"\u003eMechanics doing partial drivetrain refurbishments\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"2057\" data-start=\"2054\"\u003e\r\n\u003ch3 data-end=\"2081\" data-section-id=\"10onbcu\" data-start=\"2059\"\u003eWho Should Use It?\u003c\/h3\u003e\r\n\r\n\u003cp data-end=\"2112\" data-start=\"2082\"\u003eThis is best for cyclists who:\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"2405\" data-start=\"2113\"\u003e\r\n\t\u003cli data-end=\"2176\" data-section-id=\"v2jl0c\" data-start=\"2113\"\u003eNotice \u003cstrong data-end=\"2176\" data-start=\"2122\"\u003eskipping or wear specifically in the smallest cogs\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"2243\" data-section-id=\"1qv1ixn\" data-start=\"2177\"\u003eWant to extend cassette life instead of replacing the whole unit\u003c\/li\u003e\r\n\t\u003cli data-end=\"2312\" data-section-id=\"n04ok6\" data-start=\"2244\"\u003eRun Shimano Deore → XTR 12-speed systems on HG\/Micro Spline setups\u003c\/li\u003e\r\n\t\u003cli data-end=\"2405\" data-section-id=\"11w9i1b\" data-start=\"2313\"\u003eRide in fast terrain where the 10T is frequently used (road sections, hardpack, XC racing)\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"2410\" data-start=\"2407\"\u003e\r\n\u003ch3 data-end=\"2427\" data-section-id=\"1g7992f\" data-start=\"2412\"\u003eBottom Line\u003c\/h3\u003e\r\n\r\n\u003cp data-end=\"2776\" data-start=\"2428\"\u003eThe Shimano CS-M9100 10–12T sprocket unit is a \u003cstrong data-end=\"2523\" data-start=\"2475\"\u003esmart repair part rather than a full upgrade\u003c\/strong\u003e. It lets you replace the most wear-prone gears in a 12-speed cassette, restoring performance at a lower cost than a full cassette replacement. It’s most valuable when your drivetrain is still healthy but the smallest gears have started to wear or skip.\u003c\/p\u003e\r\n","brand":"Shimano","offers":[{"title":"Default Title","offer_id":45472333791292,"sku":"Y1X498030","price":415.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2261\/8940\/files\/6937_A4bIEiYSRfi2.jpg?v=1780924660","url":"https:\/\/www.olympiccycles.co.za\/products\/shimano-csm9100-sprocket-unit-10-12t-1","provider":"Olympic Cycles","version":"1.0","type":"link"}