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Generic · Chain tensioner
A spring-loaded, double-pulley tensioner for internally geared hub setups.
$34.99
PriceIn stock, ready to ship
The CT-S500 is a practical way to manage chain tension on a frame with vertical dropouts and a rear derailleur mount. Its double-pulley design and strong spring help keep the chain taut, while washers provide useful chainline adjustment during installation.
Sold by Ashburton Cycles
Verified store
Price
$34.99
Use
Single-speed internally geared hub
Pulley configuration
Double pulley
Chainline
41.8 mm
The CT-S500 is a chain tensioner for internally geared hub systems, designed for frames with a rear derailleur mount and vertical dropouts. It uses two jockey wheels and spring tension to take up chain slack, making it a useful option where the frame does not provide horizontal or sliding dropouts for direct chain adjustment.
Fitment is specific, so check your drivetrain before ordering. It is intended for single-speed chainline arrangements, accepts a rear sprocket from 18 to 20 teeth, and supports a maximum front chainring difference of 16 teeth. It is compatible with CN-HG93, CN-HG71 and CN-HG53 chains, as well as the CS-S500 sprocket.
Installation allows 5 mm of chainline adjustment using washers on the mounting bolt, helping you align the chain cleanly with the hub sprocket. The tensioner weighs just over 200 g in a published real-world measurement. Do not use it with coaster-brake or fixed-gear hubs; confirm the vertical dropout and drivetrain requirements before fitting.
A good choice for anyone building or converting a bike with vertical dropouts to an internally geared hub drivetrain and needing reliable chain tension without sliding dropouts.
Spring-loaded tension
Maintains chain tension as the drivetrain runs and helps accommodate normal chain slack.
Double-pulley layout
The two-pulley arrangement guides the chain through the tensioner for a controlled chain path.
For vertical dropouts
Designed for frames with a vertical drop end where the rear wheel cannot be moved to set chain tension.
5 mm chainline adjustment
Washers on the mounting bolt let you fine-tune alignment between the chain and rear sprocket.
Single-speed hub application
Intended for internally geared hub setups using a single-speed chainline arrangement.
Defined sprocket compatibility
Suitable for rear sprockets from 18 to 20 teeth, with a 20-tooth maximum.
Broad chain compatibility
Works with CN-HG93, CN-HG71 and CN-HG53 chains.
Important hub restriction
Not suitable for coaster-brake or fixed-gear hubs, so check your hub type before purchase.
Every detail as listed by the manufacturer.
Generic is a catalogue designation for products presented without a distinct store-brand identity. The term describes the retail classification rather than a separate manufacturer history or geographic origin. Generic-labelled products can still have clearly defined specifications, standards and compatibility requirements. For this component, the catalogue designation is retained while the fitment details identify the relevant road bottom bracket application.
Generic · Chain tensioner
A spring-loaded, double-pulley tensioner for internally geared hub setups.
$34.99
In stockUse
Single-speed internally geared hub
Pulley configuration
Double pulley
Chainline
41.8 mm
Chainline adjustment
5 mm
The CT-S500 is a practical way to manage chain tension on a frame with vertical dropouts and a rear derailleur mount. Its double-pulley design and strong spring help keep the chain taut, while washers provide useful chainline adjustment during installation.
The CT-S500 is a chain tensioner for internally geared hub systems, designed for frames with a rear derailleur mount and vertical dropouts. It uses two jockey wheels and spring tension to take up chain slack, making it a useful option where the frame does not provide horizontal or sliding dropouts for direct chain adjustment.
Fitment is specific, so check your drivetrain before ordering. It is intended for single-speed chainline arrangements, accepts a rear sprocket from 18 to 20 teeth, and supports a maximum front chainring difference of 16 teeth. It is compatible with CN-HG93, CN-HG71 and CN-HG53 chains, as well as the CS-S500 sprocket.
Installation allows 5 mm of chainline adjustment using washers on the mounting bolt, helping you align the chain cleanly with the hub sprocket. The tensioner weighs just over 200 g in a published real-world measurement. Do not use it with coaster-brake or fixed-gear hubs; confirm the vertical dropout and drivetrain requirements before fitting.
A good choice for anyone building or converting a bike with vertical dropouts to an internally geared hub drivetrain and needing reliable chain tension without sliding dropouts.
Spring-loaded tension
Maintains chain tension as the drivetrain runs and helps accommodate normal chain slack.
Double-pulley layout
The two-pulley arrangement guides the chain through the tensioner for a controlled chain path.
For vertical dropouts
Designed for frames with a vertical drop end where the rear wheel cannot be moved to set chain tension.
5 mm chainline adjustment
Washers on the mounting bolt let you fine-tune alignment between the chain and rear sprocket.
Single-speed hub application
Intended for internally geared hub setups using a single-speed chainline arrangement.
Defined sprocket compatibility
Suitable for rear sprockets from 18 to 20 teeth, with a 20-tooth maximum.
Broad chain compatibility
Works with CN-HG93, CN-HG71 and CN-HG53 chains.
Important hub restriction
Not suitable for coaster-brake or fixed-gear hubs, so check your hub type before purchase.