Bare knuckle performance
Bare Knuckle Performance, sprung chain tensioner
Bare Knuckle Performance, sprung chain tensioner
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A secondary (rear wheel) chain tensioner. We all know that rear chain slap; whipping; stretch and regular adjustments comes with the territory. Sounds bad but this automatic chain tensioning device makes the world a better place by keeping a constant tension on the bottom side of the chain for a nicer ride; less maintenance and a longer lasting chain. Note: Requires fitment and welding by a qualified mechanic.
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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.