SKU: 62612147712

ByK E-540 x 3i

$359.55 $399.50
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No.2 Bestseller on duoplus.be >

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USA
  • USA
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Ships within 48 hours · Estimated delivery Jul 10 - Jul 15

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Description

ByK E-540 x 3iThe perfect fit bike for fast growing kids 540x3i Age: 7 11 years Height: 130 160 cms Ability Level: Confident rider, with the safety of internal gears and added footbrake. A totally innovative bike never before has a bike at this level offered so much dynamically, efficiently and safely. We have considered every component to increase strength and lower the overall weight. Features the super cool Shimano 3 speed internal gears with a footbrake, and

The perfect fit bike for fast growing kids

540x3i | Age: 7 - 11 years | Height: 130 - 160 cms

Ability Level: Confident rider, with the safety of internal gears and added footbrake.

A totally innovative bike - never before has a bike at this level offered so much dynamically, efficiently and safely. We have considered every component to increase strength and lower the overall weight.

Features the super cool Shimano 3 speed internal gears with a footbrake, and the incredibly lightweight ByK RGO frame. Just 11+kg.

They grow up so fast don't they? Now, their bicycles can grow with them! Trade in your ByK for a larger model within 1 year of purchase, you get 50% back of the original purchase price, towards a new bike. Trade it in within 3 years of purchase and you'll get 30% back of the original price, towards a new bike.

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FRAME : Butted Alloy Frame, Low Gravity Concept Design, CRM Forks
GEARS: Shimano 3 speed internal gears
WHEELS: Dynamic Advantage Tall Alloy Wheels, Reinforced 36 Hole with Toughnut Eyelets
Tyres: Low-Profile, Low-Resistance Design with Tough Tubes
Brakes: Alloy Tektro Front & Rear Calibrated V brakes
Brake Levers: Alloy Tektro Custom Sized Levers
Saddle: Adjustable, Comfort XL Midi Deluxe
Handlebars: Custom Width Low Rise V-Bars
Safety Reflectors: Included
Bells: Included
Kickstand: Included

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WEIGHT: 10.7kg
MINIMUM SEAT HEIGHT: 66cm

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ByK Bikes want to make sure you love your ByK as much as they love making them, so they will do everything in our power to make sure you are a happy ByK customer. If you’re experiencing an issue with your ByK, we want to assist you in resolving that issue. Please contact us first to ask if we can fix the issue. If not, we'll help you with the warranty process, if the issue is outside of normal 'wear and tear.'

Please note that the warranty applies only to the original owner of the product and proof of purchase must be shown at time of warranty enquiry. If your purchased item is not as described or faulty upon receipt of purchase, ByK will happily refund or exchange your purchase.

More information can be found on the Byk Australia website here.

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Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 62612147712

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4.2 ★★★★★
Based on 1273 reviews
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B
Book fanatic
Omaha, US
★★★★★ 5
Adds comfort and support
Color: Green, Size: Twin
I’ve been using this bamboo mattress topper for a couple of weeks now, and it completely changed the feel of my bed. My mattress was starting to feel too firm and uncomfortable, especially on my lower back and shoulders, but this topper added the perfect amount of cushioning without making the bed feel overly soft or saggy. The cooling effect was one of the biggest surprises. I tend to sleep hot and usually wake up sweating during the night, but the bamboo-derived fabric feels breathable and much cooler than regular mattress pads I’ve owned before. It stays comfortable throughout the night and doesn’t trap heat like memory foam toppers sometimes do. I also really appreciate the waterproof protection. It gives peace of mind without feeling stiff or making that annoying crinkling noise some waterproof covers have. The surface still feels soft, plush, and smooth. It honestly feels more like a hotel-style pillow top than a basic mattress pad. The thickness is just right for pressure relief. It helped reduce the soreness I usually wake up with in my back, and I’ve been sleeping much more comfortably overall. The deep pockets also held securely on my twin mattress and didn’t slide around, even after moving a lot during sleep. Another thing I liked was how fluffy and well-made it looked right out of the package. After letting it expand for a bit, it became nicely plush and evenly padded. The stitching seems durable, and it still looks great after washing. If you’re looking for a softer, cooler sleeping surface with added waterproof protection and better support for aches and pains, this mattress topper is definitely worth it. It made my bed feel newer and far more comfortable without needing to buy a whole new mattress.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
W
WillieBeW3
Port Orchard, US
★★★★★ 5
BDEUS Twin Mattress Topper, So Soft
Color: Green, Size: Twin, Color: Green, Size: Twin
Having purchased BDEUS products in the past, I was very looking forward to ordering the mattress topper made of viscose (a material derived from bamboo) just to see (and feel) the benefits of the material. My concern about the material, viscose derived from bamboo, is that the process to manufacture the material can be chemically intensive leading to harsh smells. I can say the topper has no off-putting smells. The quality of the manufacturing is present as there are no loose threads/seams, the material has no defects, and the print is uniform. The use of the material also leads to increased durability while enhancing the topper’s breathability and cooling properties. The topper is fitted meaning the topper will not come off the mattress very easily (even though you may need sheet straps if you are a wild sleeper). But the softness is wild, I mean this has to be one of the softest materials I have felt, and it feels very luxurious. Waterproofing and moisture-wicking is also a benefit as small spills are not absorbed into the fabric. The topper is also very thick and plush, and while the product listing touts “Back Pain Relief” it may be too soft depending on how firm, or soft, you prefer your mattress. I have to say this is definitely a five-star offering from BDEUS. This topper is for my daughter but I’m going to order a queen-sized topper for my bed as the price is just right.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
V
Verified Purchase
Vanessa Morrell
Birmingham, US
★★★★★ 4
Definitely not cooling but comfortable
Color: Dark Grey, Size: Queen
Definitely makes my mattress more comfortable. Not finding it very cooling! Came quickly and arrived intact
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 2026
S
Saltywench
Lake Worth, US
★★★★★ 5
This topper has definitely provided me with better, more comfortable sleep.
Color: Green, Size: Twin
I recently tried a twin mattress topper made from bamboo-derived viscose, and I'm quite impressed. The topper is thick, waterproof, and offers excellent comfort, especially for those who struggle with back pain or sleep hot. The bamboo and polyester blend gives it a soft, cooling surface that's perfect for a restful night's sleep without the sweaty feeling often associated with memory foam. What I really appreciate is its dual function. It's breathable, allowing for good air flow, and fully waterproof, which helps keep the mattress underneath safe from spills. This is especially useful if you have kids or pets. The topper's thickness is just right—it provides great support without feeling too soft or too firm. It cradles pressure points well, offering relief to my hips, back, and shoulders. The fluffy filling holds up well over time, maintaining its softness and support. It fits securely on mattresses, thanks to a deep pocket skirt that prevents any sliding or bunching. This topper has definitely provided me with better, more comfortable sleep.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
B
Bunny
Whiting, US
★★★★★ 5
Soft and comfy
Color: Green, Size: Twin, Color: Green, Size: Twin
This mattress pad is much thicker and fluffier than the one I had before. With I took it out of the package, it was vacuum sealed with a note saying to leave it out in the sun for 48-72 hours or fluff it up with a hair dryer. I put it in the dryer on medium heat, which worked nicely. The pockets are really deep on this mattress pad and it fits snug. You don’t really see the shape with a sheet on top. It feels comfortable laying on top of it. It doesn’t flatten much when I’m laying down, but I imagine over time it will lose fluffiness. Overall it’s comfortable and breathable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026

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