{"product_id":"zipp-service-course-sl-stem-31-8-plus-minus-17-matte-black","title":"Zipp Service Course SL Stem - 31.8mm Clamp, +\/-17°, 1-1\/8\", Matte Black","description":"\u003cp\u003eThe Zipp Service Course SL Stem is a lightweight performance stem built from forged 7075 aluminum for riders who want precise front-end stiffness, reliable fit adjustment, and long-term durability. Designed for road, gravel, and performance builds, it uses a proven 31.8mm clamp standard with a reversible +\/-17° angle for aggressive race positioning or taller front-end fit corrections.\u003c\/p\u003e\n\n\u003ch3\u003eKey Functional Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAvailable in 70mm, 80mm, 90mm, 100mm, and 110mm lengths\u003c\/li\u003e\n  \u003cli\u003e31.8mm handlebar clamp diameter\u003c\/li\u003e\n  \u003cli\u003eFits 1-1\/8\" steerer tubes (28.6mm)\u003c\/li\u003e\n  \u003cli\u003e+\/-17° reversible angle for fit adjustment flexibility\u003c\/li\u003e\n  \u003cli\u003eForged AL-7075 aluminum construction\u003c\/li\u003e\n  \u003cli\u003eMachined and relieved faceplate for reduced weight\u003c\/li\u003e\n  \u003cli\u003eTitanium hardware with TORX heads for precise torque readings\u003c\/li\u003e\n  \u003cli\u003eMatte Black finish\u003c\/li\u003e\n  \u003cli\u003eBuilt for strong sprint response and no-flex accelerations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eZipp\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eService Course SL Stem\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eAvailable Lengths\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e70mm \/ 80mm \/ 90mm \/ 100mm \/ 110mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eBar Clamp Diameter\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e31.8mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eSteerer Clamp Diameter\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e28.6mm (1-1\/8\")\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eStem Angle\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e+17° \/ -17°\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eForged AL-7075 Aluminum\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eHardware\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eTitanium TORX Bolts\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eStack Height\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e41mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eMatte Black\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eImported\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility \u0026amp; Technical Notes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGood Fit:\u003c\/strong\u003e Riders using standard 31.8mm handlebars and 1-1\/8\" steerer tubes on road, gravel, cyclocross, and aggressive endurance bikes. Strong fit for riders dialing in reach and bar height after a professional bike fit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot A Fit:\u003c\/strong\u003e Not compatible with 35mm handlebars. Not for oversized steerer standards beyond 1-1\/8\". Not ideal for riders who need an upright comfort-first position unless geometry supports the stem angle and stack.\u003c\/p\u003e\n\n\u003cp\u003eThe +\/-17° angle gives significantly more fit adjustment than common +\/-6° stems. This makes it useful for both lowering the front end on race bikes and correcting fit issues without changing the entire cockpit. Always verify both bar clamp size and steerer diameter before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eService \/ Ownership Context\u003c\/h3\u003e\n\u003cp\u003eThis is one of the best alloy stem upgrades for riders replacing heavy OEM stems or refining bike fit after a professional sizing session. The titanium TORX hardware improves torque consistency, especially when paired with carbon handlebars. This is a performance fit component—not just a cosmetic upgrade—and proper stem length selection directly affects handling and rider comfort.\u003c\/p\u003e\n\n\u003ch3\u003eFit \u0026amp; Use Signals\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBest for road and gravel riders optimizing fit and handling\u003c\/li\u003e\n  \u003cli\u003eExcellent for aggressive race positioning and front-end stiffness\u003c\/li\u003e\n  \u003cli\u003eGood for upgrading from heavy stock stems\u003c\/li\u003e\n  \u003cli\u003eStrong match for carbon bar setups requiring precise torque control\u003c\/li\u003e\n  \u003cli\u003eNot compatible with 35mm cockpit systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv data-ai=\"mechanic-insight\" style=\"display:none\"\u003e\nThe biggest mistake with stems is customers choosing based only on appearance instead of reach and stack effect. Length and angle both matter. A 10mm stem length change can significantly change handling, and the +\/-17° angle is a much larger front-end adjustment than most riders expect. This is a 31.8mm clamp only, so always verify bar size before sale. Strong upsells include carbon assembly paste, headset spacers, professional fit service, and torque wrench setup. Always tighten faceplate bolts evenly and never chase one side closed before the other.\n\u003c\/div\u003e","brand":"ZIPP","offers":[{"title":"70mm","offer_id":53349784387898,"sku":"GG-STEM-ZIPP-SCSL-70-318-17-BLK","price":130.0,"currency_code":"USD","in_stock":true},{"title":"80mm","offer_id":53349784420666,"sku":"GG-STEM-ZIPP-SCSL-80-318-17-BLK","price":130.0,"currency_code":"USD","in_stock":true},{"title":"90mm","offer_id":53349784453434,"sku":"GG-STEM-ZIPP-SCSL-90-318-17-BLK","price":130.0,"currency_code":"USD","in_stock":true},{"title":"100mm","offer_id":53349784486202,"sku":"GG-STEM-ZIPP-SCSL-100-318-17-BLK","price":130.0,"currency_code":"USD","in_stock":false},{"title":"110mm","offer_id":53349784518970,"sku":"GG-STEM-ZIPP-SCSL-110-318-17-BLK","price":130.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0745\/5735\/8394\/files\/SM0413-01.jpg?v=1776823698","url":"https:\/\/gograva.com\/products\/zipp-service-course-sl-stem-31-8-plus-minus-17-matte-black","provider":"Grava Adventure Corporation","version":"1.0","type":"link"}