RD25 Rear Derailleur Chain Tensioner

About this item

Product Identity: This cycle component is an RD25 rear derailleur chain tensioner built specifically for folding cycle drivetrain setups with a 7-speed rear derailleur.
Core Function: As a rear derailleur chain guide, it works with a compatible rear derailleur to guide and maintain proper tension on the chain throughout every move and pedal stroke.
Construction & Material: Crafted from aluminum alloy, this bike drivetrain part features a lightweight open-frame arm, a hook-style derailleur-hanger mounting section, and an included locking hanger screw for secure installation.
Key Specifications: This folding bike chain tensioner is equipped with an 8-tooth nylon guide wheel that measures 32.5 mm in diameter, paired with a 114 mm long arm 12 mm broad guide-wheel assembly, weighing only 110.6 g total.
Usage Advantage: The chain tensioner delivers smoother, more consistent chain movement on a 7-speed folding bike, supporting reliable moving and stable chain retention during regular rides.

Whether you are a daily traveler, a weekend tourer, or someone who simply enjoys the convenience of a folding bike, keeping your drivetrain running smoothly makes each travel more enjoyable. This cycle component is an RD25 rear derailleur chain tensioner designed exclusively for folding cycle setups paired with a 7-speed rear derailleur, giving you a specially designed upgrade that fits your bike’s unique configuration. As a rear derailleur chain guide, its primary job is to work alongside your existing compatible rear derailleur to guide the chain and hold consistent tension across the full range of gears. This means fewer skipped work periods, less chain slap, and more predictable power transfer with every pedal stroke, whether you are climbing a gentle hill or cruising along a flat city path. Crafted from lightweight yet strong aluminum alloy, this bike drivetrain part equilibrium durability with a feathery feel thanks to its open-frame arm design. The hook-style derailleur-hanger mounting section makes positioning straightforward, and the included locking hanger screw helps hold everything firmly in place once installed, so you can ride assuredly that the component will stay aligned. This folding bike chain tensioner comes with an 8-tooth nylon guide wheel measuring 32.5 mm in diameter, a 114 mm long arm, and a 12 mm broad guide-wheel assembly, all adding up to a total weight of just 110.6 g. The nylon wheel helps friction and working noise, while the compact overall profile keeps your drivetrain looking clean and uncluttered even on space-conscious foldingIn everyday use, the chain tensioner helps create a smoother, more reliable moving experience on your 7-speed folding bike. From quick commutes across city leisurely rides along waterfront paths, it supports stable chain retention and consistent performance, making it a practical addition for anyone who wants their folding bike to move crisply ride post-ride.

Option: Black