A completely strapless, aero-optimised long top tube pack that integrates seamlessly on your bike to increase carry capacity for long, fast days in the saddle.
The Aero Bolt-On Long Top Tube Module is a performance-oriented solution for competitive gravel racers who need to carry a bit more on their bikes, while maintaining a clean, secure fit.
The module can be run in isolation or combined with the Aero Frame Module, to create a complete watt-saving system that also increases carry capacity.
For years we’ve helped riders go further, now we’re helping them to go faster. Learn how.
– Works with Frame Module to improve aerodynamics
– Transfer panel technology reduces drag
– Waterproof, zipped closure
– Ultralight Hexagrid construction
Materials & Technology
Product Information
Weight
– Top tube module – 120g
Total System Weight (incl. Frame Module)
– Aero System (Medium) – 325g
– Aero System (Large) – 355g
Storage Configuration
– Single main compartment
Closure System
– Full length waterproof zipper
Attachment System
– Two M5 hex-headed bolts anchor module to top tube mounts ensuring a gap-free fit
– Elastic tensioner contours to the stem and draws Transfer Panels inwards for a flush fit and aerodynamic efficiency
Reinforced Structure
– Full-length internal carbon base plate ensures a rigid, strap-free fit to the top tube
– Internal HDPE thermoplastic frame
Waterproofing
– Seam Welded: bespoke materials and RF welding create watertight seams
Visibility
– Reflective graphics
Testing Data
Care & Maintenance
Climate Footprint
Raw Material Processing and Product Assembly are the most significant contributors to our products climate footprints.
Estimated Carbon Emissions For
Aero Bolt-On Long Top Tube Module

| You can find out more about CO2e estimates and how they are calculated here. |
Specifications
64 mm bolt spacing and 5 cm of fore-aft adjustment ensures precise alignment between the module and rear of the stem, essential for maximising aerodynamic performance.
Product Information
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SAVE MONEY. MODIFY AT ANY TIME. PAUSE, SKIP OR CHANGE
Close all zippers before washing
Wash at max 30°C
Hand washing with cold water (or gentle wash cycle)Using mild, high quality detergent
Drip drying in shade, do not machine dry
Avoiding ironing and bleachThe instructions on your garment’s label
Sorting your clothing by color
Avoiding fabric softener.
Our clothing isn’t meant to be dry cleaned and soaking clothing is not ideal
Storage
Unused sealed sachets should be stored inside the box in a well-ventilated, dry place and protected from moisture, heat and direct sunlight. Can be stored for up to 3 years.
Size
Each sachet contains 30g powder.2 x 30g sachets per carton box.
Makes 2x litres of bike cleaner
100% plastic free packaging
Readily biodegradable ingredients
100% water free
Refill your old bottle and help reduce plastic waste
92% saving in packaging compared to 2 x 1L bike cleaner
100% environmentally friendly ingredients, including plant based raw materials
Supplied in a compostable sachet and printed with vegetable inks
FSC recycled card box containing 2 x sachets – that makes 2L of bike cleaner
Safe on all parts and surfaces including carbon fibre
Will not harm seals, cables, disc brake pads or rotors
Alkaline based and free from alcohol, CFCs, EDTA, solvents or acids
Vegan & vegetarian friendlyCruelty free, not tested on animals
Sachet Instructions
1. Grab your empty old bottle of Muc-Off. (You may need a pair of adjustable pliers to remove the trigger from the bottle). Or purchase our Bottle for Life.
2. Fill up to the shoulders of the bottle with 1 litre of lukewarm water for faster formula activation!
3. Carefully cut one corner of the sachet open along the diagonal cut lines.
4. You can carefully pour the sachet straight into the top of the bottle. Or using the box, fold the inside of the lid together using the printed lines as a guide and use this as a funnel to pour the powder into your bottle. (Please see our video for full instructions on this.
5. Screw your spray trigger back onto the top of the bottle. Ensure it’s tight!
6. Shake the bottle vigorously for 30-60 seconds to activate the formula. If you notice any undissolved powder simply keep shakin’ it!
7. Go clean that filthy bike!