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2024 Early Rider

Hellion 20

A 20″ aluminum frame mountain youth bike with upper mid-range components and shimano deore hydraulic disc brakes.
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Manufacturer Price

$1,399
Weight21.2 lbs  
FrameAluminum
SuspensionHardtail, 80mm
ForkRST SPEX
Wheels20″ Aluminum
Drivetrain1 × 10
GroupsetGX
BrakesShimano Deore Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
Hellion 20
Other Mountain Youth bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

16 mph

Hellion 20

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full Hellion model range

View Comparison
Reviews
Downtown
Early Rider Hellion 16 on Test – Kids’ Bikes up to 16” 2025

Aug 2025 · Jonny Grapentin

The Early Rider Hellion 16 looks more like a bike for the bike park than your backyard. But how much trail cred does it really have?

Highs
  • Rugged off-road spec

  • Powerful brakes

  • Conversion to gears possible

Lows
  • Too heavy for lightweight riders

Read Review

MBR
I’ve guinea pigged dozens of bikes on my kids in the past 10 years, and the Early Rider Hellion is the best blend of price and performance I’ve seen - MBR

Apr 2025 · Jamie Darlow

Is suspension a good idea on a kids mountain bike? We all grew up with fully rigid bikes, and “it never did me any harm”, the internet roundly told me. The idea that the next generation of riders should have a crap time on their bikes because us millennials did is daft though. Just because we rode around on bone-crunchingly hard shopping bikes doesn’t make it a good idea. Suspension makes it easier to ride without crashing, more comfy, and my kids are increasingly likely to come riding with me again. That sounds like a win to me. Enter the Early Rider Hellion, it’s the epitome of mountain bike development, with a lightweight alloy frame, a 100mm travel fork and a host of little details dialling it in to young riders. It is truly standing on the shoulders of giants, passing down the painfully acquired knowledge of decades of riding, thousands of bikes, and millions of rides. Here’s why it’s one of the best kids mountain bikes around, and why my kid and I like it so much… – Short of time? Click here to skip to the verdict – Early Rider Hellion 24 need to know Triple-butted aluminium kids hardtail, with CNC’s chainstay yoke and sliding dropouts to grow the frame Three ‘sizes’ thanks to a choice of 16, 20 and 24in wheel options First RST fork with light damping tune for small riders Kid specific cockpit and components, with short cranks and a narrow bar Sizing The Hellion comes in a choice of three wheel sizes, 16, 20 and 24in, spanning ages 4-11 years. There’s very little difference between the Hellion models, except the smallest bike gets a rigid fork. The chainstays grow proportionally between the wheel sizes, as does the front centre measurement. Really then you can think of the wheel sizes as akin to sizing on an adult bike. This is really important – on any bike – because it ensures the smallest or biggest sizes don’t end up with out of whack geometry. Specifically, chainstays that are too short for proper stability when descending and climbing, or too long to turn corners properly. Building three different sizes is absolutely going to add complexity for Early Rider, and therefore cost too, but it’s worth paying in my opinion. Afterall, the goal is for your kids to have a good time… and want to come back and do it all again. Frame The frame is made from the same stuff pretty much all kids bikes are made from, 6061 alloy. It’s light, cheap and strong. Early Rider has used triple butted tubes to give it an edge though, saving weight where the frame is under less stress. In my experience kids like bright colours on their mountain bikes, and it’s a shame the Hellion doesn’t come in bright orange or hot pink. Clearly it’s been designed to appeal to mums and dads, with a brushed metal or army green finish. The finishing is sublime all the same, …Continue reading »

Highs
  • • Lightweight frame with good sizing and spot on geometry, comes in three wheel sizes

  • • Brilliant RST fork delivers grip even at low pressures, with usable tuning functions

  • • Excellent choice of components, with 11speed Shimano drivetrain and easy pull brake levers

  • • Grippy tyres and lightweight wheels make for speed and confidence

Lows
  • • The price is really high for all the tech

  • • Could do with a dropper post

Read Review

Geometry
Specs
Build
Frame

TRIPLE BUTTED AL6061, INTERNAL CABLING, DROPPER READY

BB StandardBSA, Threaded

ColorsBrushed Aluminium; Forest Green; Electric Purple; Sage Green; Violet Haze

Fork

RST SPEX, 80MM TRAVEL, 15mm THRU AXLE

Travel80mm

Spring TypeAir

Bottom Bracket

ER EXTERNAL CUP, THREADED, SEALED CARTRIDGE BEARING

Headset

SEMI INTEGRATED, 1 1/8" CARTRIDGE BEARING

Stem

RITCHEY OS FORGED AL6061, 35MM REACH

Handlebar

560MM RITCHEY OS DOUBLE BUTTED AL6061, 18MM RISE

Saddle

ER WINGED, RAILED

Seatpost

RITCHEY, 30.9MM x 225MM, AL2014

TypeRigid

Pedals

ER CNC'D AL6061, PLATFORM, STUDDED, CARTRIDGE BEARING

Grips

ER LOCK ON KRATON 92MM

Groupset
Rear Derailleur

SRAM GX 10SPD SHORT CAGE

Crank

SAMOX 127MM DIRECT MOUNT, NARROW Q FACTOR

Shifters

SRAM GX TRIGGER RH 10SPD

Cassette

SRAM PG1020 11-36T, 10SPD

Chain

KMC X10

Brakes

SHIMANO DEORE BR-MT500, 160MM ROTORS

TypeShimano Deore Hydraulic Disc

Wheels
Rims

20 X 28H, DOUBLE WALLED TUBELESS COMPATIBLE

Front Hub

CNC'D STRAIGHT PULL AL6061, 15x100MM THRU AXLE

Rear Hub

CNC'D STRAIGHT PULL AL6061, 12x142 THRU AXLE

Tires

Front: VEE CROWN GEM SKINWALL 20x2.25", 72TPI FOLDING, Rear: VEE CROWN GEM SKINWALL 20x2.25", 72TPI FOLDING

Rider Notes
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First added July 17

Last updated December 7

Not listed for 448 days