Progressive Suspension
Progressive Suspension, fork spring kit heavy duty. 49mm
Progressive Suspension, fork spring kit heavy duty. 49mm
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45/65 lbs/inch spring rate. With 2.62" spacer. Progressive rate fork springs of superior quality. Precision wound and made of high quality chrome silicon wire. Provides a smooth ride but the progressive rate helps prevent bottoming out when taking big bumps. Each kit comes with progressive fork springs and necessary spacers. OEM replacement reference 45500337; 45500456; 45500373; 45500385; 45500447
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Why buy from Forty5°
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Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
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Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
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Founder-led aftersales
Get in touchQuestions after fitment? You'll speak to the people who installed it. We answer email and WhatsApp seven days a week.