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Best Razor Dirt Bikes: MX125 to MX650 Dirt Rockets by Age

Every Razor Dirt Rocket by age: MX125 (5+, 8 mph), MX350 and SX350 (8+, 14 mph), MX400, MX500 (14+), SX500 and MX650 (17 mph), plus the RSF650.

By Mini Bike ReviewPublished 4 min readHow we research
A kids' electric dirt bike in a backyard

Affiliate disclosure: product links on this page go to Amazon or to the maker's own store. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you; links to makers' own stores earn us nothing. No retailer or brand sees our picks before they are published or has any say in them. How we choose.

Pick a Razor Dirt Rocket by age and weight: the MX125 for ages 5+ (8 mph), the MX350 for 8+ (14 mph), the MX500 for 14+ and up to 175 lb (15 mph), and the MX650 for the biggest riders (17 mph, 16/14 in tires) (per the Amazon listings). All use sealed lead-acid batteries.

Razor's models are listed on Amazon, most sold by Amazon. Figures here come from those listings; riding rules come from CPSC's ATV safety guide.

Our top picks at a glance

  1. 1. Best for older teens

    Razor MX650 Dirt Rocket

    Age: Not stated in listing · Top speed: 17 mph · Battery: 36V SLA · Run time: Up to 40 min

    Amazon

  2. 2. Best for teens 14+

    Razor MX500 Dirt Rocket

    Age: 14+ · Top speed: 15 mph · Battery: 36V SLA · Run time: Up to 40 min

    Amazon

  3. 3. Best SX styling

    Razor SX500 Dirt Rocket

    Age: Teens (listing) · Top speed: 15 mph (title) · Battery: 36V SLA · Run time: Up to 40 min

    Amazon

  4. 4. Best for ages 8+ (more power)

    Razor MX400 Dirt Rocket

    Age: 8+ · Top speed: 14 mph · Battery: 24V · Run time: Up to 30 min (high)

    Amazon

  5. 5. Best for ages 8+

    Razor MX350 Dirt Rocket

    Age: 8+ · Top speed: 14 mph · Battery: 24V SLA · Run time: Up to 60 min (low)

    Amazon

  6. 6. Best McGrath edition

    Razor SX350 Dirt Rocket

    Age: 8+ · Top speed: 14 mph · Battery: 24V SLA · Run time: Up to 60 min (low)

    Amazon

  7. 7. Best for ages 5+

    Razor MX125 Dirt Rocket

    Age: 5+ · Top speed: 8 mph · Battery: 12V SLA · Run time: Up to 80 min (low)

    Amazon
1

Best for older teens

Razor MX650 Dirt Rocket

For the biggest riders in the Razor line.

Age
Not stated in listing
Top speed
17 mph
Battery
36V SLA
Run time
Up to 40 min

Pros

  • 650W, dual disc brakes
  • 16/14 in knobby tires, sold by Amazon

Cons

  • Heavy lead-acid battery
  • 90-day warranty

Razor lists the MX650 with a 650W chain-driven motor, up to 17 mph, up to 40 minutes of continuous use, a 36V sealed lead-acid system, dual suspension, dual disc brakes, 16/14 in pneumatic knobby tires and a 90-day warranty (per the Amazon listing).

Check price on Amazon
2

Best for teens 14+

Razor MX500 Dirt Rocket

For teens up to 175 lb.

Age
14+
Top speed
15 mph
Battery
36V SLA
Run time
Up to 40 min

Pros

  • 16/14 in pneumatic tires
  • 175 lb limit

Cons

  • 12-hour charge

Razor lists the MX500 with a 500W motor, 15 mph, a 36V sealed lead-acid battery for up to 40 minutes, a 12-hour charge, 16/14 in tires, a 175 lb (79 kg) limit, ages 14 and up and a 90-day warranty (per the Amazon listing).

Check price on Amazon
3

Best SX styling

Razor SX500 Dirt Rocket

For teens who want the supercross look of the MX500 class.

Age
Teens (listing)
Top speed
15 mph (title)
Battery
36V SLA
Run time
Up to 40 min

Pros

  • Dual suspension, dual disc brakes
  • Sold by Amazon

Cons

  • 90-day warranty

Razor lists the SX500 for teens with a chain-driven motor, dual suspension, dual disc brakes, up to 15 mph and a 36V sealed lead-acid battery for up to 40 minutes, with a 90-day warranty (per the Amazon listing).

Check price on Amazon
4

Best for ages 8+ (more power)

Razor MX400 Dirt Rocket

For kids 8+ up to 140 lb.

Age
8+
Top speed
14 mph
Battery
24V
Run time
Up to 30 min (high)

Pros

  • 12 in pneumatic knobby tires
  • 140 lb limit

Cons

  • 30 minutes on high speed

Razor lists the MX400 for ages 8+, a 140 lb limit, up to 14 mph, a 24V battery, up to 30 minutes on high speed and 12 in pneumatic knobby tires (per the Amazon listing).

Check price on Amazon
5

Best for ages 8+

Razor MX350 Dirt Rocket

For kids 8+ who need a low-speed mode.

Age
8+
Top speed
14 mph
Battery
24V SLA
Run time
Up to 60 min (low)

Pros

  • High-low speed switch
  • Sold by Amazon

Cons

  • Rear brake only

Razor lists the MX350 for ages 8 and up, 12 in spoked wheels with pneumatic tires, a hand rear brake, up to 14 mph in the default high setting and a 24V sealed lead-acid battery for up to 60 minutes in low speed mode (per the Amazon listing).

Check price on Amazon
6

Best McGrath edition

Razor SX350 Dirt Rocket

For kids 8+ who want McGrath graphics.

Age
8+
Top speed
14 mph
Battery
24V SLA
Run time
Up to 60 min (low)

Pros

  • Jeremy McGrath graphics
  • High-low speed switch

Cons

  • Same performance as the MX350
  • Stock is scarce

Razor lists the SX350 for ages 8 and up with McGrath graphics, 12 in pneumatic knobby tires, up to 14 mph in high mode and up to 60 minutes in low mode, with a 90-day warranty (per the Amazon listing).

Check price on Amazon
7

Best for ages 5+

Razor MX125 Dirt Rocket

For first-time riders ages 5 and up.

Age
5+
Top speed
8 mph
Battery
12V SLA
Run time
Up to 80 min (low)

Pros

  • Razor's smallest dirt bike
  • Sold by Amazon

Cons

  • Outgrown quickly

Razor calls the MX125 its smallest electric dirt bike, for ages 5 and up, with 12 in spoked wheels, a hand rear brake, up to 8 mph in high and a 12V battery for up to 80 minutes in low (per the Amazon listing).

Check price on Amazon

How we chose

Every in-stock Razor Dirt Rocket was matched to the age, weight and speed figures in its listing. Picks are ordered from biggest to smallest rider.

Razor Dirt Rocket sizes at a glance

Per each Amazon listing
ModelAgeMax weightTop speedTires
MX1255+Not stated8 mph12 in
MX350 / SX3508+Not stated14 mph12 in
MX4008+140 lb14 mph12 in
MX50014+175 lb15 mph16/14 in
SX500TeensNot stated15 mphNot stated
MX650Not statedNot stated17 mph16/14 in

Lead-acid batteries

Every Dirt Rocket here runs sealed lead-acid batteries: 12V on the MX125, 24V on the 350 and 400, 36V on the 500 and 650. Run times run 30 to 80 minutes, and Razor lists a 12-hour charge on the MX500. For lithium bikes with longer range, see electric dirt bikes for teens.

Razor RSF650: street style

The Razor RSF650 is not a dirt bike: Razor lists a street-style frame, 14 in mag wheels with street tires, a 650W 36V motor, 17 mph, up to 50 minutes, ages 16 and up, a 220 lb limit and a 2-year warranty (per the Amazon listing). It is for private paved areas, not public roads.

What to skip

Skip sizing up for a child to grow into; the age and weight lines are there for control. Skip riding without a helmet: a DOT-labeled youth helmet that fits is covered in how to choose a dirt bike helmet. CPSC also advises supervision for young riders.

Frequently asked questions

Which Razor dirt bike is best for a 10 year old?

The MX350 or MX400, both listed for ages 8 and up at 14 mph; the MX400 lists a 140 lb limit. The MX500 is listed for 14 and up.

How fast does a Razor MX650 go?

Up to 17 mph, with up to 40 minutes of continuous use on its 36V sealed lead-acid battery, per the listing.

How long does a Razor dirt bike battery last?

Listed run times are 30 to 80 minutes: 80 minutes in low mode on the MX125, 60 on the MX350, 40 on the MX500 and MX650.

How long does it take to charge a Razor dirt bike?

Razor lists a 12-hour charge on the MX500. Use only the charger that came with the bike.

What is the weight limit on a Razor dirt bike?

The MX400 lists 140 lb and the MX500 175 lb (79 kg). The RSF650 street bike lists 220 lb.

Sources

  1. All-Terrain Vehicle Safety, U.S. Consumer Product Safety Commission
  2. Choose the Right Motorcycle Helmet, National Highway Traffic Safety Administration

Cover image: Illustration: Mini Bike Review (AI-generated)

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