BMC Blast 20 Junior Mountain Bike 2021 - Bronze £600.00 – Start Fitness
Use code BF10 for an additional 10% off*
Use Code
  • BM30000458

BMC Blast 20 Junior Mountain Bike 2021 - Bronze

BLAST’s mission is to empower young riders to go out and escape, share experiences and create incredible memories that they will look back on forever.

The BLAST kids bike lets young riders truly embrace their creative side. Their bike with their identity.

A bike built for adventure, ready for ripping the local trails, tearing down to the park, or spinning over to school.

The kids bikes feature a lightweight Aluminium frame with a dependable geometry tailored for young riders.

Lightweight Frame
Double butted tubes for a lightweight frame with a distinctive and premium look.

Superior Ergonomics
Bars, levers, cranks and saddle are tailored to the ergonomics of young riders for a comfortable and custom-made ride.

Dedicated Geometry
Inspired by our MTB’s and adapted to smaller riders for intuitive and reliable riding.

Control and Safety
Hydraulic brakes and high volume tires guarantee control and safety on various surfaces with low rolling resistance.

Powder Coating
A durable and ecological solution that withstands years of daily use.

Easy Assembly
BLAST is ready to ride right out of the box with a few quick and easy assembly steps.


  • Lightweight aluminium frame and fork
  • SRAM 1x8 drivetrain
  • Tektro HD-M286, short reach hydraulic brakes
  • Kenda Booster 20x2.4" tyres


Product Code BM30000458
Brand BMC
Gender Junior
Age Junior
Model Year 2021
Frame Blast 20" Lightweight Aluminium with Powder Coat Finish 1 1/8" head tube BSA threaded bottom bracket 140 mm post mount 9x135 mm QR
Fork Blast 20" Lightweight Aluminium with Powder Coat Finish 140 mm post mount 9x100 mm QR
Shifters Sram X4 8Spd Trigger
Brakes Tektro HD-M286, Short Reach Levers, 140 mm Rotors
Crankset Lightweight Forged Alloy Cranks, 32T 1x Specific Narrow Wide Chainring, 127 mm
Cassette SRAM 11-34T, Black Finish
Chain SRAM 8spd
Hub Front CNC Machined Alloy Hub Body, Sealed Bearings, Quick Release
Hub Rear CNC Machined Alloy Hub Body, Sealed Bearings, Quick Release
Rims Alex MD25, 25 mm Inner Width
Tyres Kenda Booster 20x2.4"
Handlebar SDG Slater Handlebar, 650 mm Wide, 20 mm Rise, 19 mm Bar Ends, 31.8 mm Clamp.
Stem BMC BLAST, 40 mm Length, ± 6 angle
Saddle SDG Fly Jr
Seatpost Alloy 27.2 mm
Wheel Size 20inch
Number of Gears 8


Ready to ride

Every bike from Start Fitness is fully checked & assembled before despatch and will arrive, almost, ready to ride. Each bike is assembled by one of our CyTech accredited mechanics and then packed into one of our custom boxes. Minimal assembly, with basic tools, is required before you can ride. Assembly tools are not usually included. Please note: Some bikes are not supplied with pedals. Manufacturers don’t know if you want flat or clipless pedals, rather than send the bike with the wrong type, they leave the choice for you to make.   This process has a lead time of between 5-7 working days Unfortunately during peak times this may be slightly delayed. We will however, aim to despatch your bike as quickly as possible.  

Making sure you are home

Once fully checked and boxed, we will contact you to book a delivery date. Our bikes are despatched on a next working day service (excludes weekends & bank holidays) for UK mainland orders, or a two day service to Northern Ireland and outlying Scottish areas. European bike deliveries usually take approximately one week.  

Taking Delivery

Any mechanical or cosmetic issues need to be reported to us within one week of the delivery date. If you do not plan on using the bike straight away, we advise that you remove it from the box and check it over ASAP as we cannot be responsible for any reported issues (other than standard warranty issues) later than one week from the date that the bicycle was delivered.  

First Check-Over

After a few weeks of riding (depending on riding style and conditions), a new bike will need a check-over to make final adjustments and to re-check all nuts and bolts. This is necessary as the bike goes through a ‘bedding in’ phase after which, final adjustment may be necessary. We recommend that this is carried out by a CyTech qualified mechanic. It is important to have these checks carried out to prevent any avoidable problems which may not be covered by warranty and to ensure the smooth running of the bicycle.   We can carry out the first check-over free of charge, at our Newcastle store (NE16JE). If you’ve had the bike delivered, it will be your responsibility to get the bicycle to and from our store for this work to be carried out. This complimentary check-over does not include any labour to replace worn parts or to fit new accessories.   All bikes must be booked in for the first service & must be clean or a £15 cleaning charge will be payable. You can book this by calling 0191 261 4191. Proof of purchase will need to be presented when the bicycle is dropped off for the first check-over.  

Bike Servicing

Bicycles need to be serviced regularly, as a guideline we would advise on at least one full service per year and/or a standard service twice a year. If the bike is used regularly in adverse conditions, more regular servicing may be required.


Book a call with one of our experts to get more information on this product.



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BMC Blast 20 Junior Mountain Bike 2021 - Bronze