Quick answer: The RFN Warrior SX-E700 has an approximate seat height of 490mm and is generally designed for confident riders around 100–120cm tall.
Most important: the SX-E700 is physically similar in size to the SX-E500 but offers more power, range and hydraulic braking. Rider experience matters more than seat height alone.
RFN Warrior SX-E700 Seat Height & Rider Size Guide
The RFN Warrior SX-E700 has an approximate seat height of 490mm, 14-inch wheels and a general rider-height guide of around 100–120cm.
These measurements are very similar to the SX-E500, but the two bikes are aimed at different levels of rider experience.
The SX-E700 is the premium performance model in the RFN Warrior Kids range. It adds up to 700W of peak power, a larger battery and hydraulic disc brakes.
This means a child may physically fit the SX-E700 but still be better suited to the more manageable SX-E500.
This guide explains the SX-E700 seat height, rider dimensions, fit checks and how to decide whether the rider is physically and practically ready for the bike.
RFN Warrior SX-E700 Sizing at a Glance
SX-E700 rider size guide
- Seat height: approximately 490mm
- Recommended rider height: approximately 100–120cm
- Recommended age: around 4–8 years
- Wheel size: 14-inch front and rear
- Bike weight: approximately 20kg
- Maximum rider weight: approximately 50kg
- Best rider: confident or experienced young rider
- Previous model: RFN Warrior SX-E500
- Available versions: SX-E700 MX and SX-E700 SM
The SX-E700 shares a similar seat height and rider-height guide with the SX-E500.
The main difference is its higher level of performance. Choosing between them should therefore be based more on rider experience than physical size alone.
What Is the RFN Warrior SX-E700 Seat Height?
The RFN Warrior SX-E700 has an approximate seat height of 490mm, or around 19.3 inches.
This is measured from the ground to the top of the seat.
The seat height is similar to the SX-E500, so riders who physically fit one model are likely to fit the other.
However, seat height is only one part of bike fit.
The following should also be checked:
- Rider inside-leg measurement
- Arm and brake-lever reach
- Ability to support the 20kg bike
- Confidence using a twist throttle
- Experience using separate front and rear brakes
- Comfort with the lowest speed setting
A child may reach the ground comfortably but still lack the riding experience needed for the SX-E700.
What Rider Height Is the SX-E700 For?
The SX-E700 is generally designed for riders approximately 100–120cm tall.
This is a broad guide rather than a fixed rule.
| Rider Height | Likely Fit | Recommendation |
|---|---|---|
| Below 100cm | Likely too small | Compare the SX-E400 or SX-E500 |
| 100–110cm | Physical fit may be suitable | Choose between SX-E500 and SX-E700 based on experience |
| 110–120cm | Strong physical fit | Confirm the rider can safely manage the performance |
| Above 120cm | May feel too compact | Consider a physically larger youth electric bike |
A rider close to the lower end of the guide may physically fit the bike but still be better served by the SX-E500.
A rider near 120cm should be checked for knee room, standing space and handlebar clearance.
What Inside-Leg Measurement Does the Rider Need?
RFN provides a rider-height and seat-height guide rather than a strict minimum inside-leg measurement.
You can still measure the child’s inside leg to help judge whether the 490mm seat is likely to feel manageable.
To measure the rider’s inside leg:
- Ask the child to stand upright against a wall.
- They should wear the boots or footwear they will ride in.
- Place a book firmly between their legs to represent the seat.
- Measure from the floor to the top edge of the book.
The inside leg does not have to equal the full 490mm seat height.
The suspension may compress under the rider’s weight, and a confident child may support the bike using the balls of their feet or one foot firmly on the ground.
The rider should still feel secure and capable of stopping the bike from leaning.
Does the Rider Need Both Feet Flat?
No. The rider does not necessarily need both feet completely flat on the floor.
Many experienced riders can manage the SX-E700 when they can place the balls of both feet down or one foot securely on the ground.
Because the SX-E700 is aimed at confident riders, ability to control the bike matters more than achieving completely flat-footed contact.
However, a young rider should not be balancing on the very tips of their toes or relying on an adult every time they stop.
A Good SX-E700 Fit Should Look Like This
- The rider reaches the handlebars naturally
- They can operate both hydraulic brake levers
- They can support the bike with at least one foot
- Their knees are not cramped around the bars
- They can stand comfortably on the footrests
- They can hold the bike upright without excessive help
Can the Rider Reach the Hydraulic Brake Levers?
The SX-E700 uses front and rear hydraulic disc brakes.
The rider must be able to reach and operate both levers comfortably while maintaining control of the handlebars.
Hydraulic brakes normally require less hand pressure than mechanical systems, but reach remains important for younger riders.
When seated naturally, the child’s elbows should remain slightly bent rather than fully extended.
They should be able to turn the handlebars in both directions and use either brake without moving their entire hand away from the grip.
If the rider cannot reach both brake levers correctly, the SX-E700 is not a safe fit.
Can the Rider Manage the SX-E700’s Weight?
The RFN Warrior SX-E700 weighs approximately 20kg.
This is only slightly heavier than the SX-E500, but it remains a substantial bike for a young child.
The rider should be able to:
- Hold the bike upright when stationary
- Turn the handlebars at low speed
- Support the bike when stopping
- Use both brakes without losing balance
- Recover if the bike begins to lean
- Move the bike a short distance when switched off
A rider may meet the height guide but still be unable to manage the bike’s weight.
In that situation, the SX-E500 or SX-E400 may be a more suitable option.
How the 14-Inch Wheels Affect Rider Fit
The SX-E700 uses 14-inch wheels at the front and rear.
This is the same general wheel size as the SX-E500.
The 14-inch setup provides:
- Improved stability over uneven surfaces
- Easier rolling across grass and bumps
- A more substantial motocross-style riding position
- More room than the smaller SX-E400 chassis
The wheels do not make the SX-E700 physically much larger than the SX-E500.
The difference between the two bikes is mainly their performance, battery and braking components.
Is the SX-E700 Suitable for a Small 4-Year-Old?
The SX-E700 is unlikely to be the best choice for a small four-year-old.
Even when the rider is close to 100cm tall, they may struggle with:
- The 20kg bike weight
- The 490mm seat height
- Reaching both hydraulic brakes
- The lowest speed of approximately 9.5mph
- The stronger acceleration
For most smaller four-year-olds, the SX-E400 or SX-E500 will provide a more manageable starting point.
Is the SX-E700 Suitable for a Tall 5-Year-Old?
A tall five-year-old may physically fit the SX-E700, but physical fit alone is not enough.
The rider should already:
- Balance confidently on two wheels
- Use a twist throttle smoothly
- Operate front and rear brakes correctly
- Stop calmly and on command
- Have previous electric-bike experience
A tall but inexperienced five-year-old may still be better suited to the SX-E500.
Is the SX-E700 Suitable for a 6-Year-Old?
The SX-E700 can suit many confident six-year-old riders.
A six-year-old within the height guide who has progressed from the SX-E500 or another electric bike may be ready for the stronger performance and hydraulic brakes.
A six-year-old who is new to throttle-controlled bikes may be physically large enough but still better suited to the SX-E500.
Is the SX-E700 Suitable for a 7-Year-Old?
The SX-E700 can be a strong option for a confident seven-year-old within the 100–120cm rider-height range.
Many riders at this age will have enough coordination and strength to manage the bike’s 20kg weight and hydraulic controls.
Rider experience should still be checked before progressing beyond Eco mode.
Is the SX-E700 Suitable for an 8-Year-Old?
The SX-E700 may suit an eight-year-old who remains within the recommended physical-size range.
A taller eight-year-old may look cramped on the 14-inch chassis even though the performance remains suitable.
Check the rider’s knee room, standing position and handlebar clearance before ordering.
A child significantly taller than 120cm may require a physically larger youth electric bike.
Signs the SX-E700 Is the Correct Size
The SX-E700 is likely to fit correctly when the rider can:
- Sit naturally without stretching forwards
- Reach the throttle and both brake levers
- Turn the handlebars fully
- Support the bike with at least one foot
- Stand comfortably on the footrests
- Hold the bike upright while stationary
- Control the bike calmly in Eco mode
The rider should look comfortable, confident and physically in control.
Signs the SX-E700 Is Too Large
The SX-E700 may be too large if the rider:
- Cannot reach the ground securely
- Cannot reach both hydraulic brake levers
- Struggles to turn the handlebars
- Cannot support the bike when stopped
- Looks stretched towards the controls
- Is frightened by the bike’s weight or Eco mode
- Does not yet balance confidently
These signs suggest the SX-E500 or SX-E400 may offer a safer fit.
Signs the SX-E700 Is Too Small
The SX-E700 may be physically too small if the rider:
- Is significantly taller than 120cm
- Looks cramped around the handlebars
- Has excessively bent knees
- Has limited space when standing on the footrests
- Has already physically outgrown other 14-inch bikes
In this situation, moving to a physically larger youth model may make more sense than choosing the SX-E700 for its power alone.
RFN Warrior SX-E500 vs SX-E700 Seat Height
The SX-E500 and SX-E700 have very similar physical sizing.
The main decision is based on rider ability and performance requirements rather than seat height.
| Sizing Feature | SX-E500 | SX-E700 |
|---|---|---|
| Seat Height | Approximately 490mm | Approximately 490mm |
| Rider Height | Approximately 100–120cm | Approximately 100–120cm |
| Wheel Size | 14-inch | 14-inch |
| Bike Weight | Approximately 19kg | Approximately 20kg |
| Best Rider | Confident beginner or developing rider | Confident or experienced rider |
| Top Speed | Approximately 18.5mph | Approximately 21.5mph |
| Brakes | Mechanical disc brakes | Hydraulic disc brakes |
Choose the SX-E500 for a rider who fits the physical size but is still developing throttle and braking control.
Choose the SX-E700 for a rider of the same physical size who already has enough experience to use its stronger performance.
Read our full RFN Warrior SX-E500 vs SX-E700 MX comparison.
Does the MX or SM Version Change Rider Size?
No. The SX-E700 MX and SX-E700 SM share the same general rider sizing, seat height and weight guidance.
The difference is the tyre setup rather than the physical rider fit.
| Version | Best Terrain | Seat Height |
|---|---|---|
| SX-E700 MX | Grass, dirt, fields and loose off-road ground | Approximately 490mm |
| SX-E700 SM | Smooth, firm and prepared private surfaces | Approximately 490mm |
Choose between the MX and SM according to the surface where the bike will be used rather than the rider’s size.
Read our RFN Warrior SX-E700 MX vs SX-E700 SM comparison.
Seat Height vs Rider Experience
The SX-E700 is the clearest example of why seat height cannot be used on its own.
A rider may fit the 490mm seat perfectly but still be unprepared for the stronger acceleration and 21.5mph maximum speed.
The correct rider should combine physical fit with:
- Reliable two-wheel balance
- Smooth twist-throttle control
- Ability to use both brakes
- Enough strength to manage the bike
- Experience stopping calmly and on command
- Confidence without overestimating ability
How to Check the Fit Before the First Ride
Complete a stationary fit check before allowing the rider to use the SX-E700.
- Place the bike on flat ground with the power switched off.
- Help the child sit naturally on the seat.
- Check that they can reach the handlebars without stretching.
- Confirm they can operate the throttle and both brake levers.
- Ask them to turn the bars fully in both directions.
- Check how securely they can place their feet on the ground.
- Ask them to support the bike without excessive help.
The rider should then begin in Eco mode within a large, flat and controlled private riding area.
My Take as a British Motocross Rider
The SX-E700 has almost the same physical sizing as the SX-E500, so I would never choose between them from seat height alone.
The real question is whether the rider is experienced enough for the extra power and hydraulic braking.
A child around 100–120cm tall may fit both bikes perfectly. The SX-E500 is the better option while they are learning, and the SX-E700 is the better option once they already have good control.
For me, physical fit gets the rider onto the shortlist, but their ability decides whether the SX-E700 is genuinely right.
RFN Warrior SX-E700 Seat Height FAQs
What is the RFN Warrior SX-E700 seat height?
The SX-E700 seat height is approximately 490mm, or around 19.3 inches.
What rider height is the SX-E700 for?
It is generally designed for riders approximately 100–120cm tall.
What age is the SX-E700 for?
The usual age guide is around 4–8 years old, although ability and experience are particularly important.
Does the rider need both feet flat?
No, but they should be able to support the bike securely and remain stable when stopping.
How heavy is the SX-E700?
The bike weighs approximately 20kg.
What is the maximum rider weight?
The maximum recommended rider weight is approximately 50kg.
Is the SX-E700 suitable for a small four-year-old?
It will normally be too substantial for a small or inexperienced four-year-old. The SX-E400 or SX-E500 may be more suitable.
Is the SX-E700 suitable for a tall five-year-old?
It may physically fit, but the rider should already have strong throttle and braking control.
Is the SX-E700 suitable for a six-year-old?
Yes, it may suit a confident six-year-old with previous electric-bike experience.
Is the SX-E700 suitable for a seven-year-old?
Yes. It can be a strong option for a confident seven-year-old within the rider-height guide.
Is the SX-E700 suitable for an eight-year-old?
It can suit an eight-year-old who remains within the approximate 100–120cm height range.
What is the SX-E500 seat height?
The SX-E500 has a similar approximate seat height of 490mm.
Should I choose the SX-E500 or SX-E700?
Choose according to rider ability rather than seat height. The SX-E500 suits developing riders, while the SX-E700 suits experienced riders.
Does the MX or SM version change the seat height?
No. Both versions use the same approximate 490mm seat height and general sizing guidance.
Can I choose the bike from age alone?
No. Height, inside leg, arm reach, strength, balance and previous riding experience should all be considered.
Still Unsure Which RFN Warrior Fits?
Read our RFN Warrior Kids range explained guide for a full comparison of the SX-E400, SX-E500 and SX-E700.
RFN Warrior SX-E400
Approximately 460mm seat height for younger riders around 90–110cm tall.
Shop SX-E400RFN Warrior SX-E500
Approximately 490mm seat height for developing riders around 100–120cm tall.
Shop SX-E500RFN Warrior SX-E700
Approximately 490mm seat height for confident riders ready for premium performance.
Shop SX-E700Shop the RFN Warrior SX-E700 in the UK
The RFN Warrior SX-E700 has an approximate 490mm seat height and is generally designed for riders around 100–120cm tall.
Its physical size is similar to the SX-E500, but its stronger motor, larger battery and hydraulic brakes make it better suited to riders with previous experience.
For a confident child who fits the bike comfortably and has already developed reliable throttle and braking control, the SX-E700 is the premium choice in the RFN Warrior Kids range.