The Trek Slash+ 9.7 SLX/XT Electric Mountain Bike Is Oh So QuietTrek's Slash+ features dual idler pulleys for enhanced shifting performance and rider confidence, though a rattling noise persists.
Trek's $99 Electronic Bicycle Bell is essentially a Bluetooth Speaker you attach to your handlebars - Yanko DesignBicycle bell with customizable sound and music speaker functionality by Trek Bikes