G Line 4 Speed SuperRoll Bar Control 2026 Electric Folding Bike
Size
Technical specifications
Description
Electric G Line is designed as a one-bike solution for the city and beyond. Confident on a wide range of surfaces, it delivers comfort and control hour after hour while remaining compact enough to travel and store easily.
Big ride feel, compact storage
The frame geometry gives a full-size riding experience yet folds into a compact, locked package in under 20 seconds using the original Brompton fold. It fits trains, car boots and small spaces — even one-person tents — and can carry a rack, mudguards and bags.
Engineered electric system, lightly summed
Brompton’s purpose-built electric system combines a robust rear motor, a cutting-edge battery and a handlebar display with Adaptive Range Estimation and Start Assist. The system supports over-the-air updates via the companion app.
Practical everyday kit
G Line arrives fitted with full-length mudguards and a roller frame as standard, plus custom puncture-resistant 20” tyres and a rugged front carrier block. It’s UL-certified for safety and includes space for a toolkit inside the frame.
Key Features:
Compact fold into a locked package in under 20 seconds, ideal for multi-modal travel and small storage spaces
Three sizes (Small, Medium, Large) with a single-size frame and adjustable stem and seatpost, developed with a world-leading bike fit expert
Integrated electric drive: robust rear motor, cutting-edge battery and handlebar display with Adaptive Range Estimation and Start Assist, plus over-the-air updates via companion app
Motor assist up to 15.5 mph and up to 45 miles of range
20” wheels with custom puncture-resistant tyres for a balance of agility and stability
Roller frame and full-length mudguards fitted as standard; compatible with racks, bags and water bottle mounts
UL-certified construction and rugged front carrier block for durable, adventure-ready use
Compact, travel-friendly design that stores a toolkit inside the frame and rolls smoothly when folded
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Frequently asked questions
I'd like to buy this item. How do I proceed?
You can buy this bike right now at the asking price. Click and go straight to checkout.
If you'd rather negotiate, here's how it works:
- Make an Offer:
Start by submitting an offer to the seller. You can offer the asking price or suggest a lower amount, it's up to you! The seller will then have the option to accept, decline, or make a counteroffer. - Secure Payment:
Once the seller accepts your offer, you'll receive a payment link via email. You can securely complete your purchase using a credit/debit card, PayPal, or Klarna. - Order Confirmation:
After payment, the seller will receive an order confirmation so they can arrange fulfilment of the bike.
You can either collect the bike in person or arrange to have it shipped to you by our specialist delivery partner.
I'd like to negotiate the price, how do I do this?
Whether you would like to purchase the bike for asking price, or try to get a better deal, we ask all buyers to submit an offer to the sellers first. Once an offer is accepted, you will be sent a payment link to complete the purchase!
- Click the "" button on the listing page.
- Enter your contact details and the amount you'd like to offer.
- The seller will either accept, decline or make a counteroffer.
- You will receive the outcome via email so keep your eyes peeled!
- Once you've agreed on the price, you'll be sent a payment link to complete the purchase.
- Your new bike will be shipped to you!
How can I contact the seller?
If you would like to ask the seller a question about the bike, then please use the Contact seller button above. The seller will receive your question by email.
If you have any questions on shipping, collections or returns, then feel free to reach out to us directly.
How long does delivery take, and how much does shipping cost?
Shipping costs are fixed at £89 no matter where you're living in the U.K.
We aim to deliver your new bike within 4-7 days* of placing an order. Here's the process:
- Once an order is placed, we contact the seller to arrange a suitable date for our delivery partner to collect the bike.
- The bike will then be delivered to you, typically the same day it's been collected from the seller.
- You're ready to ride! Our couriers collect and deliver the bikes without the need for them to be disassembled.
*Please note that delivery times may be longer if the seller is not at home for the couriers to collect the bike within the 4-7 day period.
Can I collect in person?
Yes! You can collect the bike from the seller yourself. We ask that you agree on a price first and follow the standard checkout process before arranging the meet-up.
This ensures that all transactions are completed securely on the MyNextBike platform.
Collection process
- Agree on a price with the seller
- Complete the purchase: You will be sent a payment link to finalise the transaction.
- Select "Collect in Person" at checkout
- Arrange the collection or viewing date
- Confirm whether you leave with the bike
Can I test ride the bike first?
Yes you can! It's the same process as if you are collecting the bike. We ask for buyers to agree a price first and follow the standard checkout process. This ensures that all transactions are completed securely on the MyNextBike platform, allowing us to provide buyer and seller protections.
How does buyer protection work?
Our Buyer Protection policy is in place to prevent any mis-selling on the platform and ensure you get exactly what you paid for! If the bike arrives "not as described", such as there is damage that wasn't disclosed in the listing, or the specifications are wrong, then you can return it to the seller free of charge. Simply contact our support team and we will arrange this for you. To learn more, please read here.