CarbonXS cycles mad 6, kids with bike

Kids these days! With such awesome junior-sized bikes coming out recently, they’ll never understand the experience of clambering onto an oversized frame, stretching out over an integrated stem and fumbling with 21 non-indexed gears (of which only eight or nine actually ran smoothly). At the risk of forever spoiling the future generation, mechanical engineer and avid rider David Stevens founded CarbonXC Cycles and created a super lightweight, pro-spec bike that’s designed to perform for a small child the way our big bikes do for us.

Intended for 4-7 year old riders the size adjustable, carbon framed Mad 6 will turn your kid into a lifelong bike snob with its high end components, titanium trim and featherweight tuned suspension. If you’re already picturing your little tyke shredding on a new level, read on for all the specs and details…

CarbonXS cycles mad 6, side shot

The Mad 6 is made primarily of carbon fiber, including some 3D printed components, with some 6061 aluminum parts. The frame is size adjustable to three different positions to grow along with your kid, and CarbonXS will set it up specifically to your child’s measurements before shipping it to you. The complete bike weighs under 15.4lbs with pedals, enabling small kids to ride longer and even climb singletrack trails.

CarbonXS cycles mad 6, frame close up

The Mad 6 carries a maximum weight limit of 56lbs and its suspension is specifically designed for riders under this limit, giving young kids the same comfort and performance that we adults enjoy. Suspension duties are handled by a gas-dampened rear shock that boasts 50mm of travel with an adjustable titanium coil, and a pair of custom 65mm travel full carbon forks up front.

CarbonXS cycles mad 6, geometry image

Wheelbase: (A) 608mm / 23.93”
Chainstay Length: (B) – 353mm / 13.89”
Fork Off Set: (C) 40mm / 1.57”
Seat Tube Length: (E) 215mm / 8.46”
Top Tube Length: (F) 405 – 420mm / 15.94 – 16.53”
Steerer Angle: (D)
Frame Position 1 – 69 degrees
Frame Position 2 – 67 degrees
Frame Position 3 – 65 degrees
Inseam range: 38cm / 15” to 65cm / 25.5” (approx)

The low-standover frame can accommodate riders roughly 31” to 51” tall, and features a 1-1/8” head tube that sits between 69 and 65 degrees depending on the setup. The frame uses a press fit style bottom bracket that spins a kid-sized 150mm CNC aluminum crankset on ceramic bearings.

CarbonXS cycles mad 6, front end CarbonXS cycles mad 6, rear disc brake

The components are top shelf by anyone’s standards with the stock build including a carbon handlebar, SRAM XO grip shift and X9 derailleur, 27.2mm carbon seat post holding up the company’s own carbon saddle, a 35 tooth carbon front chain ring, Shimano XT rear brake, chain and 9 speed cassette, Maxxis tubeless compatible tires, and of course magnesium pedals with ti spindles. And there are options for further upgrades!

The Mad 6’s 20” carbon wheelset comes with your choice of 38mm or 50mm deep dish rims on Novatec 291/712 hubs. The bike has no front brake, and while their website simply states the maximum rider weight of 25kg is easily handled by the XT rear brake alone, I can only imagine this would also prevent untold over-the-bars scenarios with young riders.

CarbonXS cycles mad 6, kid holding bike CarbonXS cycles mad 6, kid riding

The Mad 6 is available direct from the company’s website, and comes in black with gold accents. Customers should expect a 2-4 week delay for assembly. With all its proprietary carbon and titanium the price tag isn’t as shocking as you might expect, starting at $2775 USD. Since it’s coming from Australia, I’d anticipate some shipping costs on top of that.


  1. I really, really hope if my kid take to my passion, they enjoy bmx (street and dirt) while young. Soooo much cheaper and you learn the same skills that can transfer to MTB when they get to be a more “stable” size.

  2. Love all the advancement in kids bikes. My daughter is only 15 months right now, just think how much more awesomer her bike could be when she is finally old enough 🙂

  3. I was expecting the price to be twice that with the spec and impressive level of detail. What an amazing little bike. It would be great to see however, even shorter cranks, 150mm still seems too long for this size bike, and a shorter seat, as well as a front brake. Regardless this bike looks awesome!

  4. So, who buys bikes that can be ridden for just 2-3 years max? Oh, hang on, most adult mountain bikers buy new bikes after 2-3 years, and a lot of those cost twice as much. Forget I asked…

  5. They put the rear brake on the left because of the grip shift. It teaches kids the wrong brake side from the beginning. It is hard to unlearn. They need to put the brake on the right side.

  6. @anonymous,
    This type of construction isn’t necessarily lighter or stiffer, but it’s pretty cool looking and lends itself to adjustability. The manufacturer can get away with simply cutting to shape off-the-shelf (or inexpensively custom specced) flat carbon fiber plate. Reminds me of r/c car chassis.
    I’d absolutely use a front brake, though.

  7. No front brake makes it illegal it sell in Australia as it does not comply with AS/NZS 1927:1998 which specifics a minimum of two brakes, one of which must be a back-pedal brake for all child bikes

  8. Just a quick note about braking. The MAD6 does not qualify as a child’s bicycle in Aust (pursuant to 1.4.2 of AS/NZS 1927:1998), as the wheel base is greater than 765mm (it is actually 841mm – there was a typo on the original web spec’s). The bike is also a custom made cycle as well as a specific bicycle designed for racing, which both exempt it from the standard.
    As for the most important point – stopping. Stopping an under 25kg child does not take much effort or require a lot of traction and as Steve has mentioned above ” I can only imagine this would also prevent untold over-the-bars scenarios with young riders”

    P.S. Kids love skids – Bike can do great skids !

  9. yogibimbi – 09/29/15 – 6:16pm
    “…Oh, hang on, most adult mountain bikers buy new bikes after 2-3 years…”

    Is this actually true?
    Note to self: talk to wife.

  10. This is extremely cool. I am glad someone is doing this. I throw in another vote for a front brake. My oldest is 7 and rides a small mountain bike in the same “spirit” as this. They figure it out when taught and he hasn’t had any problem. Even with their light weight a rear brake is not enough in the steep and loose.

  11. I got one of these bikes for my daughter-just turned 8. She has loved it and is so much more able to ride our local trails now. I can’t see how riding a 15kg steel frame with useless front forks allows a kid’ to learn to ride properly’. The whole family can now ride together and seeing the fun she gets from it makes it worth every cent. Maybe in loose dirt a front brake would be helpful but where we ride it makes no difference not having one.

  12. @b_p_t Throw a front brake on there and kids will most likely learn just fine how to handle a bike and will probably progress faster than they would on a ht. They will also learn how to preload their suspension and how to distribite their weight properly for and aft over their bike for maximum traction per given section of trail. Both aforementioned point would be much harder to master on a rigid bike or hardtail. Let’s be honest. Any one getting their grom $3000 mtb is probably not going to bat an eye to get them a spendy bmx bike either.

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