{"product_id":"primary-clutch-spring-140-330-sku-05-140-330","title":"Primary Clutch Spring (140-330) \/\/ SKU: 05-140-330","description":"\u003ch3\u003ePrimary Drive Clutch Spring (140-330) \/\/ SKU: 05-140-330\u003c\/h3\u003e\n\u003cp\u003eFine-tune your clutch engagement and maintain consistent peak operating RPM under heavy load with the Bikeman Performance \u003cb\u003e140-330 Primary Clutch Spring\u003c\/b\u003e. As a core component of your drive clutch calibration, the primary spring directly governs engagement speed, upshift timing, and peak RPM retention across your powerband.\u003c\/p\u003e\n\u003cp\u003eFeaturing a \u003cb\u003e140 lb initial load and a 330 lb finish load\u003c\/b\u003e, this spring profile delivers crisp, responsive engagement while the aggressive 330 lb finish rate provides heavy side pressure to hold target operating RPM without fading during long, full-throttle pulls or high-horsepower boost loads. Precision-manufactured from high-tensile spring steel, it resists heat sag and rate degradation under severe operating conditions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Performance Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e140-330 Spring Rate Curve:\u003c\/b\u003e 140 lb initial rate delivers responsive, controlled engagement; 330 lb finish rate maintains high belt clamping force at full shift-out.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHolds Target Shift RPM:\u003c\/b\u003e Prevents RPM drop and belt slippage under heavy horsepower, high boost, or severe hill-climbing loads.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHigh-Tensile Alloy Construction:\u003c\/b\u003e Engineered to withstand rapid compression cycles, extreme under-hood temperatures, and high torsional stress without losing rate profile over time.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eVersatile Tuning Component:\u003c\/b\u003e Ideal for pairing with stock or aftermarket adjustable clutch weights to tailor clutch calibration to specific tracks, elevations, or power mods.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSKU:\u003c\/b\u003e 05-140-330\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eInitial Load:\u003c\/b\u003e 140 lbs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFinish Load:\u003c\/b\u003e 330 lbs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eComponent Type:\u003c\/b\u003e Primary Drive Clutch Spring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003ePrimary Function:\u003c\/b\u003e Controls engagement speed, upshift force, and high-load peak RPM retention\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":53717232419109,"sku":"05-140-330","price":27.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6436\/9701\/files\/05-140-330.webp?v=1788209936","url":"https:\/\/www.bikemanperformance.com\/products\/primary-clutch-spring-140-330-sku-05-140-330","provider":"Bikeman Performance","version":"1.0","type":"link"}