Bike type
Folding bikes (Brompton): front bags, carrier blocks and lines
Brompton Front Bags carry up to 10 kg on the frame, Brompton Electric needs its own block and bag, and the US block lists A, C, P, T and G Line fitment.
Also listed as Brompton, folding bike
We may earn a commission if you buy through links on this page. How we make money
Short answer
On a Brompton, front bags clip to a Front Carrier Block on the frame, and Brompton says they carry up to 10 kg. Brompton Electric uses a dedicated block, so it needs an Electric-compatible Front Bag. For the valve and bar size, check your own bike with the valve finder; no source we read covers folding bikes.
Key facts
- Tire and rim pressure limits
- Schwalbe says the sidewall pressure range should never be exceeded or undershot.[1]
- How to check your valve
- Look at the stem. A thin stem (nominally 6 mm, per Park Tool) with a small locknut at the top is Presta. A wider stem, about 8 mm (5/16 in), is Schrader. Dunlop/Woods has a narrow tip over a large ring. The valve finder on this site walks through each.[2]
- Pumps and inflation
- Not confirmed
- Tubeless and repair
- Not confirmed
- Handlebar and mounts
- Not confirmedMeasure your bar; no source says which diameter folding bikes use.
- Bags and racks
- Brompton says its Front Bags carry up to 10 kg, with the load on the frame rather than the handlebars. Its US Front Carrier Block listing gives fitment for A Line, C Line Mk5 and Mk6, P Line Mk1, T Line and G Line.[3][4]
- Lighting rules
- Rules are set by place, not by kind of bike. For example, California requires a white front lamp visible from 300 feet in darkness, while Oregon requires a white front light visible from at least 500 feet in limited visibility. Check your own state or province.[5][6]
- Charging and batteries
- Not confirmedFor Brompton Electric's battery, see the e-bike page for CPSC's charging advice.
- Maker cautions
- Brompton says Brompton Electric uses a dedicated Front Carrier Block, so it needs an Electric-compatible Front Bag with space for the battery. Brompton does not map each bag to a line, so check the bag's listing.[3]
- Not confirmed
- The US Front Carrier Block listing names no Electric models and no maximum load; that Electric is left out is our reading of the list, not a Brompton statement. No source we read covers valves or bar diameters on folding bikes.[4]
Watch out for
- Brompton Electric uses a dedicated Front Carrier Block, so a standard block and bag are not the Electric setup.
- Brompton's US Front Carrier Block listing names 5 mm and 4 mm Allen keys and a Phillips screwdriver as the tools to fit it.
- Brompton's 10 kg figure is for its Front Bags carried on the frame; it is not a handlebar load.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
Home floor pump
Park Tool PFP‑10 Home Mechanic floor pump (160 psi)Choose the PFP-10; it is the only version listed.
Park Tool lists a head for Presta and Schrader valves. Check which valve your bike has first.
Phone mount
SP Connect Universal Bike Mount (phone, 20‑44 mm bars and stems)Choose the Universal Bike Mount (SKU 53342).
SP Connect lists tool-free fitting to bars or stems of about 20-44 mm. Measure yours first.
Next: Brompton front bags, standard vs Electric and how to measure your handlebar.
Questions
How much can a Brompton front bag carry?
Brompton says its Front Bags can carry up to 10 kg, with the load on the frame rather than the handlebars.[3]
Does a standard Brompton front bag fit Brompton Electric?
Brompton says Brompton Electric uses a dedicated Front Carrier Block, so it needs an Electric-compatible Front Bag with space for the battery. See Brompton front bags, standard vs Electric.[3]
Which Brompton lines does the US Front Carrier Block fit?
Brompton's US listing gives A Line, C Line Mk5 and Mk6, P Line Mk1, T Line and G Line, and lists no Electric models.[4]