TOPEAK FastFuel Bolt-On – 0.5 L Top Tube Bag
The TOPEAK FastFuel Bolt-On top tube bag provides compact, easily accessible storage for nutrition and small essentials during road cycling, gravel riding and endurance adventures. Designed to sit on the bicycle's top tube, it keeps energy gels, bars and frequently used accessories within convenient reach.
With a 0.5 L capacity, lightweight 70 g construction and two mounting options, the FastFuel Bolt-On offers a practical solution for cyclists who prefer to carry essential items directly on their bike.
Its padded compartment, adjustable bolt-on mounting slots and alternative strap attachment system make it a versatile accessory for compatible bicycle frames.
Key Features
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0.5 L storage capacity: Compact compartment for energy gels, bars and other small riding essentials.
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Dual mounting options: Attaches directly to compatible threaded top tube bosses or with straps.
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Adjustable bolt-on slots: Elongated mounting openings help accommodate different frame configurations.
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Lightweight construction: Weighs approximately 70 g.
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Padded main compartment: Provides organized storage for small items during a ride.
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Quick-access design: Wide-opening compartment allows convenient access to nutrition and accessories.
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Cable access opening: Allows a charging cable to pass through the bag when carrying compatible electronic accessories.
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Durable materials: Constructed using 500D polyester, PU leather, TPE and engineering-grade polymer.
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Compact profile: Designed to fit along the top tube while limiting unnecessary bulk.
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Alternative strap mounting: Allows installation on compatible frames without dedicated top tube mounting bosses.
Technical Specifications
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Brand: TOPEAK
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Model: FastFuel Bag Bolt-On
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Manufacturer part number: TC2313B
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Product type: Bicycle top tube bag
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Capacity: 0.5 L
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Compartments: One padded main compartment
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Materials: 500D polyester, PU leather, TPE and engineering-grade polymer
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Mounting option 1: Bolt-on attachment to integrated top tube bosses
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Mounting option 2: Strap attachment to compatible bicycle frames
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Compatible top tube diameter for strap mounting: 35–75 mm
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Compatible head tube diameter for strap mounting: 30–50 mm
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Dimensions: 18.7 × 8.2 × 4 cm
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Manufacturer-listed weight: 70 g
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Cable access: Yes
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Color: Black
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Recommended activities: Road cycling, gravel riding, endurance cycling and everyday riding
Quick Access to Nutrition and Riding Essentials
During longer rides, convenient access to nutrition can make a meaningful difference in how easily a cyclist maintains their fueling routine.
The FastFuel Bolt-On positions a compact storage compartment directly on the bicycle's top tube, keeping energy gels, bars and other frequently used items close at hand.
Its wide-opening design makes accessing the compartment convenient during stops and when conditions allow safe access.
The 0.5 L capacity is particularly suited to cyclists who want to carry a small selection of essentials without adding a larger frame bag.
Bolt-On Mounting for Compatible Bicycle Frames
One of the FastFuel Bolt-On's defining features is its compatibility with bicycle frames equipped with integrated threaded top tube bosses.
The bag incorporates elongated mounting slots that allow some adjustment in its position, helping accommodate different frame geometries and mounting configurations.
Direct bolt-on installation provides a clean appearance and eliminates the need for top tube straps when the frame has suitable mounting points.
Before installation, cyclists should confirm that their frame includes compatible bosses and that the bag can be positioned without interfering with bicycle components or rider movement.
Alternative Strap Mounting for Greater Versatility
Despite its Bolt-On name, the FastFuel also supports installation using straps.
This option makes the bag suitable for a wider selection of bicycles, including certain frames without integrated top tube bosses.
Topeak specifies compatibility with top tubes measuring approximately 35–75 mm in diameter and head tubes measuring approximately 30–50 mm in diameter for strap mounting.
Actual fit depends on the bicycle's frame geometry, tube shapes and available mounting clearance.
This versatility makes the FastFuel Bolt-On a practical accessory for riders who use different bicycles or prefer a removable storage solution.
Lightweight and Compact Construction
Weighing approximately 70 g, the FastFuel Bolt-On provides useful storage without introducing substantial additional weight.
Its compact dimensions of 18.7 × 8.2 × 4 cm help maintain a streamlined setup on compatible road and gravel bicycles.
The bag uses a combination of 500D polyester, PU leather, TPE and engineering-grade polymer to balance durability, structure and low weight.
Its padded main compartment helps organize small items while providing a degree of cushioning during normal riding.
Convenient Cable Access
An integrated cable access opening allows a charging cable to pass through the bag.
This can be useful when carrying a compatible power bank or electronic accessory, provided the equipment fits safely inside the compartment.
It adds functionality beyond nutrition storage, allowing cyclists to organize small electronic accessories during longer outings.
Frame Protection and Installation Considerations
As with other bicycle bags, contact between the bag, straps, trapped dirt and the bicycle frame can gradually affect the paint finish.
Topeak recommends protecting contact areas with suitable protective film or foam before installation.
The bag should also be positioned securely and checked periodically to ensure that it remains stable and does not interfere with pedaling, steering or other bicycle functions.
A Practical Top Tube Bag for Road and Gravel Cycling
The TOPEAK FastFuel Bolt-On 0.5 L top tube bag is a versatile storage solution for cyclists who value quick access, compact dimensions and flexible mounting options.
Its lightweight design, padded compartment, adjustable bolt-on attachment and alternative strap mounting make it particularly appealing for road cycling, gravel adventures and longer endurance rides.
For riders seeking a small, accessible storage space without the bulk of a larger frame bag, the FastFuel Bolt-On offers a straightforward and functional option.
