TorqTube - 4Nm Precision Preset Torque-Limiting Extension

Premium Modular Torque Control

TorqTube brings professional preset torque control to Prestacycle ratchets and compatible 1/4" hex driving tools. Its compact inline design combines ±4% accuracy, all-metal construction, and a patented full-overrun mechanism in a torque limiter built for demanding bicycle service.

Professional ±4% Torque Accuracy

• Factory preset to a single torque value for fast, repeatable tightening.
• ±4% torque accuracy for precision bicycle assembly and service.
• No adjustments or setup required.
• Full mechanical overrun provides unmistakable feedback when preset torque is reached.
• Automatically resets after every use.

Patented Torque-Limiting Technology

• Patented preset torque-limiting mechanical overrun mechanism.
• Full mechanical overrun limits transmitted tightening torque once the preset torque is reached
• Spring design prevents calibration drift.
• Factory calibrated for 10,000+ torque cycles at the preset torque value.
• Over-torque resistant design protects the torque mechanism from damage if excessive force is applied.
• Direct drive for unscrewing without affecting the torque-limiting mechanism.

Premium All-Metal Construction

• Steel internal torque mechanism for professional durability.
• Anodized aluminum outer housing.
• Withstands drops exceeding 10 ft (3 m) without damage or loss of calibration.
• Designed for repeated professional workshop and race-service use.
• Color-coded by torque value for fast identification.

Modular 1/4" Hex System

• Standard 1/4" hex input and output.
• Works with compatible Prestacycle ratchets and standard 1/4" hex driving tools.
• Functions as a compact inline torque-limiting component rather than a separate complete torque wrench.
• Compatible with standard 1/4" hex bits and Prestacycle bit systems.
• Can be used with compatible power drills and power screwdrivers with the appropriate adapter.
• Ratchet, bits, adapters and accessories are sold separately.

Tighten With Precision. Unscrew With Strength.

• Clockwise operation provides preset torque limiting.
• Counterclockwise operation provides direct drive for unscrewing with no torque limiting.
• Safely handles up to 30 Nm of unscrewing torque.
• One TorqTube can move between compatible driving tools as the job requires.

Built for Professional Bicycle Service

• Ideal for repeated bike builds, pre-race checks and precision workshop service.
• Excellent for carbon fiber and lightweight components where correct fastener torque is critical.
• Designed for road, gravel, MTB, cyclocross, BMX, commuter, touring and e-bikes.
• Suitable for professional mechanics, race support, mobile mechanics and demanding home workshops.

TorqTube Torque System

• Available in 2, 3, 4 and 5 Nm.
• 6 Nm coming October.
• 7, 8 and 10 Nm planned for future release.
• Choose individual TorqTubes for the torque values you use most or combine multiple values into a modular professional torque system.

FIND THE RIGHT PRESTACYCLE TORQUE TOOL

Prestacycle offers a complete family of professional bicycle torque tools, each designed for a different style of service.

Mini TorqKeys™

The smallest preset torque tools for cyclists.

• Available in 2, 3, 4 and 5 Nm
• Ultra-compact pocket design
• Includes six bicycle tool bits
• Ideal for ride kits, travel, bikepacking and everyday maintenance

Pro TorqKeys

Professional preset T-handle torque tools.

• Available in 4, 5, 6, 7, 8, 10 and 12 Nm
• Faster workflow for professional workshops
• Ergonomic four-finger T-handle
• Ideal for race mechanics, workshops and frequent service

TorqRatchet GO Lite

Portable torque-indicating multi-tool.

• Real-time torque indication
• 3–12 Nm
• Ideal for cyclists who need one portable tool for many torque values

TorqRatchet ELITE Lite

Maximum precision torque-indicating multi-tool.

• Real-time torque indication
• 2–12 Nm
• Finest 0.5 Nm resolution
• Professional workshop capability in a portable format

TorqTubes™

Premium modular preset torque limiters for professional-level service.

• Available in 2, 3, 4 and 5 Nm
• ±4% torque accuracy
• All-metal construction
• Patented full mechanical overrun torque-limiting system
• Standard 1/4" hex input and output
• Works with compatible Prestacycle ratchets and standard 1/4" hex driving tools
• Power drill and power screwdriver compatible with the appropriate adapter
• Direct drive for unscrewing up to 30 Nm
• Over-torque resistant mechanism protects against damage from excessive tightening force
• Ideal for professional workshops, race mechanics and riders who want a premium modular torque system
• Requires a compatible driving tool — TorqTube does not operate as a stand-alone tool

Coming Soon: 6 Nm
Future Sizes: 7, 8 and 10 Nm

Always tighten fasteners to the torque specification recommended by the bicycle or component manufacturer.

Product Information

Product Type: Preset Inline Torque Limiter
Product Category: Torque Tools
Torque System: Preset Torque Limiter
Torque Limiting Method: Internal Mechanical Overrun
Primary Application: Bicycle Assembly and Service
Bike Compatibility: Road, Gravel, MTB, BMX, Cyclocross, Commuter, Touring, E-Bike
Assembly Required: No
Family: TorqTube
Model: 4 Nm
Manufacturer: Prestacycle
Brand: Prestacycle
SKU: 93804
EAN: 0689466938043
UPC: 689466938043
Country of Origin: Taiwan
Country of Design: USA
Warranty: 5 Years

Torque Performance

Preset Torque: 4 Nm
Preset Torque Setting: Factory Set
Preset Torque Adjustable: No
Torque Units: Nm
Torque Accuracy: ±4%
Torque Release Feedback: Full Mechanical Overrun
Torque Limiting Reset: Automatic
User Adjustable: No
User Calibration Required: No
Calibration Method: Factory Calibrated
Calibration Stability: Spring Design Prevents Calibration Drift
Rated Torque Cycles: 10,000+ @ Preset Torque
Over-Torque Protection: Yes
Routine Maintenance: None Required

Operation

Clockwise Operation: Torque Limiting
Counterclockwise Operation: Direct Drive for Unscrewing (No Torque Limiting)
Safe for Unscrewing: Yes
Maximum Unscrewing Torque: 30 Nm
Power Tool Compatible: Yes, With Appropriate Adapter
Power Drill Compatible: Yes, With Appropriate Adapter
Power Screwdriver Compatible: Yes, With Appropriate Adapter
Adapter Included: No

Construction

Construction: All-Metal
Body Material: Steel with Aluminum Outer Housing
Torque Mechanism Material: Steel
Outer Housing Finish: Anodized Aluminum
Body Color: Red
Impact Resistance: Withstands Drops Exceeding 10 ft (3 m) Without Damage or Loss of Calibration
Patent Status: Patented
Primary Technology: Patented Preset Torque-Limiting Mechanical Overrun

Drive & Compatibility

Drive Interface: Standard 1/4" Hex
Input Interface: Standard 1/4" Hex
Output Interface: Standard 1/4" Hex
Compatible Driving Tools: Prestacycle Ratchets and Compatible Standard 1/4" Hex Driving Tools
Compatible Accessories: Prestacycle Ratchets, Extensions, Bit Sets and Compatible 1/4" Hex Accessories
Compatible Bit Types: Standard 1/4" Hex Bits
Ratchet Included: No
Bits Included: No
Extension Included: No
Power Tool Adapter Included: No

Included Items

TorqTube: 1 × 4 Nm
Included Bits: None
Included Ratchet: None
Included Accessories: None
Carrying Case Included: No

Applications

Torque Function: Yes
Ratchet Function: Requires Compatible Ratchet
Precision Final Tightening: Yes
Fast Tightening: Depends on Driving Tool
Fast Loosening: Yes, With Compatible Driving Tool
Stem Bolts: Yes, When 4 Nm Is Specified by Component Manufacturer
Handlebar Clamp Bolts: Yes, When 4 Nm Is Specified
Seatpost Clamp Bolts: Yes, When 4 Nm Is Specified
Brake Components: Yes, When 4 Nm Is Specified
Derailleur Components: Yes, When 4 Nm Is Specified
Accessory Mount Bolts: Yes, When 4 Nm Is Specified
Professional Shop Use: Yes
Home Mechanic Use: Yes
Travel Use: Yes
Race Support Use: Yes

Dimensions & Weight

Shell Diameter: 15.9 ±0.05 mm (0.62 inches)
Overall Length: 75.75 mm (2.98 inches)
Maximum Overall Width: 18.1 mm (0.7 inches)
Tool Weight: 76 g
Total Package Weight: 78 g

Service & Support

Scheduled Service Required: None
Replacement Parts Available: No
Storage Recommendation: Dry Environment
Packaging Type: Heat-Sealed Bag

Specifications are subject to change without notice. Prestacycle continually improves its products through ongoing engineering and manufacturing refinements.

Disclaimers

Check with the manufacturer of your components and fittings for proper torque specifications. Always follow Manufacturer guidelines for installation and removal of nuts, bolts and screws.

Prestacycle warrants TorqTubes to be free from defects in materials and workmanship for five years or within the rated product life cycle, whichever occurs first, under the conditions stated herein. This warranty does not apply to normal wear, misuse, modification, or operation beyond the product's specified limits. TorqTubes provide direct-drive counterclockwise operation for unscrewing up to the specified maximum of 30 Nm.

This warranty is expressly limited to repair or replacement of product found to be defective. Prestacycle assumes no liability for loss or damage due to failure of any product to perform satisfactorily. Prestacycle makes no other warranty, expressed or implied, except that of title. Any and all other warranties are expressly disclaimed.

This warranty applies under conditions of intended use and is exclusive of equipment subjected to: Failure to follow recommended service procedures, Excessive duty cycle, exposure to the elements, shipping damage and modification not authorized by Prestacycle. No warranty claims will be honored without prior authorization for repair from Prestacycle. Any replaced or repaired equipment will be warranted for the remainder of the warranty term only.