Basket Checkout
Tel: 0345 257 0808

Whyte 405 2020 Kid's Mountain Bike

Pay monthly from £32.86

* Required Fields

Collect in store only.
Free delivery

Free delivery

We don’t charge anything for standard delivery to the UK mainland over £20.

Collect in-store

Collect in-store

Pick up your order at your nearest store any day of the week.

Easy returns

Easy returns

Faff-free returns and exchanges if you’re not absolutely satisfied with your purchase.

Product Details

Whyte 405 2020 - Junior MTB For Ages 8 -12 Years

Probably the best kids' mountain bike ever for riders from around 8-12 years old. Like many of today's best adult hardtails, the Whyte 405 is SRAM 1x11-equipped.

Key Features

  • SRAM 1x11 drivetrain - why it's great
  • Lighter weight SR SunTour Epixon 100mm-travel suspension fork with alloy stanchions and steerer
  • Tektro Auriga Brakes - given how many great bikes come with these stoppers, Aurigas are probably the best proven hydraulic disc brakes in mountain biking today. Why you want quality hydraulic disc brakes
  • Whyte lock-on grips stay on

Same as Whyte 403

This is a nimble, skills-expanding MTB for youthful riders. Built to the same standards as every Whyte bike, its 13 inch frame and 26 inch wheels also make a Whyte 400-series bike perfect for shorter adults looking for a trail-ready mountain bike.

  • With its hydroformed alloy frame optimised for UK riding conditions and its progressive geometry (68˚ seat/74˚ head tube angle) to keep the rider centered and in control, a Whyte 400-series bike boasts the key features we love about Whyte mountain bikes - see blog.
  • The frame is made especially clean with Whyte's new BBX (bottom bracket exit) internal cable routing, which is weather sealed, dropper-seat ready, and designed to facilitate easier cable replacement in years to come.
  • Compared with the more common 24 inch wheel bike for younger riders, the Whyte's WTB 26x2.1 front / 26x1.95 inch rear tyre combo offers significantly improved traction, rollover and speed potential.

The 405 in Whyte's Own Words

  • 'We've broken the mould with our kids bikes. By putting 26” wheels on a kids MTB we've given a boost in performance similar to an adult switching to a 650b/27.5” Trail Hardtail. More confidence, more control and easier riding.

  • A specific lightweight tubeset - not just sawn off versions of adult pipes - shrinks, climbs and puts a tailwind into every ride. We've downsized our maximum confidence Trail geometry and fitted air sprung forks that properly work for lighter pilots so their rides are full of thrills not spills.

  • We've even stripped down the spoke count on the 26in wheels to 28 and fitted the same grippy front, fast rear tyre combinations as our full sized trail bikes, so they're fast and fun, and make every adventure easier.

  • With SRAM NX 1 by 11 spec and a trigger shifter the 405 really is a scaled down version of our award winning 900 series bikes. We have specced a XSYNC Direct Mount chainring so multiple chainrings are available to tune this bike to the size of the rider.

  • The 405 also comes with Whyte's own Get-a-Grip seat post clamping system. This easy to use clamp allows the post to be raised or lowered on the trail, even with small cold hands.'

Whyte 405 Size Guide

One Size: Suitable for kids 4' 5" - 5' 0" (135 - 152m)

Why Buy From Us?

  • Voted Britain's Best Bike Shop 2017/18
  • Rated excellent on Trustpilot by our customers
  • Free bike delivery
  • No fuss returns
  • Bikes arrive built by expert bike mechanics
  • Independent since 1977 - cooperative, not corporate. Read our story.

Shop All Kids Bikes >

Shop All Bikes for Ages 6 - 9 (20 - 24 Inch) >

Shop All Bikes For Ages 10 - 14 (24 - 26 Inch) >

Kids Bike Size Guide >

Technical Specifications

6061 Hydro Formed T6 Aluminium, Multi Butted, SCR (single chain ring optimised), BBX (bottom bracket exit) internal cable routing, Chainstay Post Mount Dropouts and Get A Grip Seat Clamp System

Whyte 405

SR Epixon, 100mm Travel, Black Alloy Stanchions, Alloy Steerer, Hydro Lockout, Air Spring, Adjustable Rebound

Rear Shocknone
HeadsetFSA No.10, Semi Integrated, Caged Bearings
Rear HubAlloy, 4 Cartridge Sealed Bearing, XD Driver, 28 Hole
Front HubAlloy, Cup & Cone, Double Seal, 28 Hole
Spokes2.0mm, Black Stainless with Brass Nipples
RimsWhyte Trail-405, 28 Hole
TyresWTB Bronson Race, 26" X 2.1", 60TPI Folding Front, WTB Riddler, 26" X 1.95", Rear
Shift LeversSRAM NX Gripshift, 11 Speed
Front Mechnone
Rear MechSRAM NX, 11 Speed
CassetteSRAM GX-1130, 13-42, 11 Speed
ChainSRAM PC-1130, 11 Speed

SRAM NX Power Spline, X-SYNC Direct Mount 28T Chainring, 11 Speed Alloy, 165mm Crank Arms

Bottom Bracket

SRAM Power Spline, 73mm

SeatpostWhyte 20mm Offset, 30.9mm x 350mm, 6061 Alloy, 2 Bolt Clamp
SaddleWhyte Custom

Whyte Riser Bar 30mm Rise, 31,8mm, 680mm Wide

StemWhyte Gravity, 40mm
GripsSRAM Lock-on
Front BrakesTektro Auriga, 160mm rotor
Rear BrakesTektro Auriga, 160mm rotor
Brake LeversTektro Auriga
PedalsFibre Reinforced Composite Platform
WeightOne Size: 12.55kg / 1 stone, 14lbs
This bike was weighed at our Aberdeen store on 21 September 2019. We weighed the complete bike as you would receive it.


Our suppliers reserve the right to change specifications and prices without notice. Edinburgh Bicycle Cooperative will do all it can to maintain prices and specifications on this web site, however we do reserve the right to change specifications and prices without notice. Similarly, despite the wonders of modern computers, it is realistic to expect the colour of any item bought to differ subtly from the image online.