Quick Analysis
Aprilia RS 457
33.5 pts
Unweighted: 25 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
KTM 50 SX
4.0 pts
Unweighted: 3 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | Liquid-cooled | — |
| Displacement | 457 cc | 49.9 cc |
| Engine Type | 2 parallel forward-facing cylinders, 4 valves per cylinder | 1-cylinder, 2-stroke engine |
| Power | 47.6 PS (≈ 35 kW) at 9,400 rpm | 5.3 bhp @ 11500 rpm |
| Torque | 43.5 Nm at 6,700 rpm | 5.2 Nm @ 7500 rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 13L | 2.3 L |
| Mileage | 30 kmpl | 30 kmpl |
Dimensions & Weight |
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| Kerb Weight | 175 | 41 kg |
| Seat Height | 800 | 653 mm |
Brakes & Suspension |
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| ABS | Dual Channel | — |
| Front Brake | Disc 320 mm 4 Piston | Disc 160 mm |
| Front Suspension | 41mm upside-down fork, adjustable preload, 120mm travel | XACT 35 WP Upside-Down fork, Ø 35 mm |
| Rear Brake | Disc 220 mm 1 Piston | Disc 160 mm |
| Rear Suspension | Monoshock, adjustable preload, 130 mm wheel travel | XACT WP mono shock |
Tyres & Wheels |
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| Front Tyre | 110/70 - 17 | 60/100 - 12 |
| Rear Tyre | 150/60 - 17 | 2.75 - 10 |
| Tyre Type | Tubeless | Tubed |
| Wheel Type | Alloy | Spoke |
Features & Technology |
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| Headlight | LED | — |
Other Specifications |
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| Battery | 12v MF | — |
| Bike Image 1 | https://motoautiv.com/wp-content/uploads/2026/04/Prismatic-Dark.avif | — |
| Bike Image 2 | https://motoautiv.com/wp-content/uploads/2026/04/Opalescent-light.avif | — |
| Bike Image 3 | https://motoautiv.com/wp-content/uploads/2026/04/GP-Replica.avif | — |
| Bike Image 4 | https://motoautiv.com/wp-content/uploads/2026/04/Coral-Snake-blue.avif | — |
| Bike Image 5 | https://motoautiv.com/wp-content/uploads/2026/04/Arsenic-yellow.avif | — |
| Color Options | Racing Stripes | #0F0F10, #C1121F Prismatic Dark | #1C1C1E, #6E6E73 Opalescent Light | #F5F5F5 GP Replica | #0B0B0C, #5A2CA0 Coral Snake blue | #1F3A93, #C1121F Arsenic yellow | #D4AF37, #6E6E73 | Electronic Orange |
| Cons | Seat height is a bit tall, may be challenging for shorter riders to place feet flat at stops. Mileage tends to be modest (around 30–35 kmpl), especially if ridden hard not ideal for those seeking fuel economy. Fuel tank capacity is moderate may require frequent refuelling on long rides or at high speeds. You'll need regular maintenance (for twin-cylinder engine, etc.) more involved than simple commuter bikes. Riding posture and engine character lean sporty less relaxed comfort compared to cruiser-style bikes or scooters. Insurance, maintenance, and running costs will be higher compared to smaller, entry-level bikes. | High Maintenance: As a 2-stroke engine, it requires frequent servicing and tuning. Small Fuel Tank: Limited capacity means more frequent refills. Kick-Start Only: No electric start, which can be tricky for very young riders. Limited Power for Older Kids: The 50cc engine may not be enough as the rider grows or becomes more skilled. Sensitive to Tuning: Owners report issues like fouling spark plugs or needing to frequently re-jet the carb: “Used to run great … then started fowling plugs … Moved to a 95 main jet … About 15 kph slower …” Parts Cost & Availability: As a race‑oriented bike, some parts can be expensive or harder to source for older models. |
| Detailed Overview | The Aprilia RS 457 is a fully faired motorcycle built around a 457cc parallel-twin engine. This engine produces around 47 PS of power and 43.5 Nm of torque, and it uses liquid cooling to maintain stable temperatures during regular riding. The engine is paired with a 6-speed gearbox, and the overall power delivery is designed to be smooth and predictable, which helps riders manage it in both city and highway conditions. The bike also comes with ride-by-wire throttle, which allows different riding modes to adjust how the engine responds. In terms of design, the RS 457 follows a typical supersport layout with a full fairing, a sharp front section, and a slightly aggressive riding posture. The aluminium frame helps keep the overall weight low, with a kerb weight of around 175 kg. The fuel tank capacity is about 13 litres, which is practical for daily use as well as weekend rides. The seat height is around 800 mm, making it accessible for a wide range of riders, although the forward-leaning position may take some getting used to. The suspension setup includes upside-down front forks and a rear monoshock, both tuned to provide stability at higher speeds. The setup leans slightly towards the firmer side, which can make bumps and uneven roads more noticeable, especially on typical Indian road conditions. The braking system includes a front disc and a rear disc, supported by dual-channel ABS, which helps maintain control during braking. The bike also uses wide radial tyres that offer grip in different riding situations. The Aprilia RS 457 comes with a modern electronics package that includes traction control and multiple riding modes. These features adjust parameters like throttle response to suit different riding conditions. All important information is displayed on a digital TFT screen, which shows speed, gear position, fuel level, and other details in a clear format. Some variants also offer a quickshifter as an option, allowing clutchless gear changes. The riding position is slightly committed, with clip-on handlebars and rear-set foot pegs, which gives it a sporty feel. At the same time, the overall size and weight make it manageable compared to larger supersport bikes. The bike is designed to offer a balance between performance and everyday usability, although factors like traffic conditions, road quality, and riding style will influence how it feels in regular use in India. | The KTM 50 SX is a purpose-built mini motocross bike, tailored primarily for very young and beginner racers who want to get a genuine motocross experience without jumping straight to bigger bikes. It’s more than just a “toy” — KTM has packed serious race-bike DNA into this 50cc model, making it a standout choice for youth motocross training and competitive racing. At the heart of the 50 SX is a 49.9 cc single-cylinder 2-stroke engine, which delivers a punchy yet manageable power output. According to KTM’s specs, this engine is paired with a centrifugal automatic clutch, meaning there’s no manual clutch lever to worry about — the clutch engages automatically, which is ideal for young riders still building coordination and confidence. The engine uses a Seletra 2p D36 system for fuel delivery (on some models), which helps in precise tuning and reliable performance. KTM has thoughtfully designed the chassis for both strength and agility. The frame is made from chromoly steel, which keeps it light but sturdy. The overall design ensures that the bike is highly maneuverable, making it easier for young riders to learn balance and control on a real race-ready structure. The 50 SX isn’t just about motor and frame — it comes with serious suspension too: a WP XACT 35 mm upside-down fork at the front and a WP mono‑shock at the rear.The front suspension travel is around 200 mm and the rear is close to 190 mm, giving enough give for track bumps and jumps. In terms of ergonomics, the seat height is just 653 mm, making it very accessible for younger riders. Ground clearance is around 233 mm, giving the bike enough space to handle uneven terrain without scraping too much.The fuel tank capacity is modest — 2.3 liters — but that’s more than enough for short motocross sessions that young riders typically do. For braking, KTM hasn’t compromised: the 50 SX is equipped with disc brakes both front and rear, each 160 mm in size. This provides good stopping power and control, which is very important for safety and learning advanced braking techniques. On the wheels front, the bike uses spoke wheels, keeping things light and rugged for off-road racing. Despite its small size, the 50 SX is very race-focused. The frame has been redesigned to mimic the flex and rigidity characteristics of full-size MX bikes. The new frame also comes with frame protectors, which help reduce damage in case of falls — a common occurrence when young riders are learning. The handlebars are lightweight aluminum, with a bend that suits smaller riders, and the footpegs are designed to give a solid grip even when things get muddy or rough. KTM also includes power-reduction kits in its parts catalog for the 50 SX. These kits let parents or coaches limit the power output while the rider is still learning, which is a smart way to scale the bike’s performance to the rider’s ability — and once they’re better, the full power can be unlocked. When it comes to reliability, the 50 SX has a liquid cooling system for better thermal management. The engine’s central crankshaft design helps in keeping the mass well-balanced, which contributes to smoother handling. As for maintenance, like all 2-stroke motorcycles, it does need regular care — but KTM has made key parts (like the clutch) durable, using a reinforced clutch basket for longevity. Overall, the KTM 50 SX is a very well-engineered youth motocross bike that brings real race performance to younger riders. It balances power, weight, and control in a way that helps beginners grow into serious racers. Whether for track training, competitive racing, or just building early riding skills, it’s absolutely one of the top choices in the mini-moto world. |
| Expert Review | The Aprilia RS 457 fits into the entry-level performance segment in India, where many riders are moving from smaller bikes to higher capacity machines. Its 457cc twin-cylinder engine feels smooth and manageable, but in daily city traffic, the riding posture and heat can still be noticeable. The suspension and chassis are set up for sporty riding, which means rough roads may feel slightly uncomfortable. It also comes with modern electronics that may take some time for new riders to fully understand. The service network is still growing, which can affect ownership experience in some cities. It is more suited for riders looking for performance-oriented riding rather than regular commuting., 4.1, MotoAutiv Team | MotoAutiv Team |
| FAQ (Manual Override) | Q: What mileage does the Aprilia RS 457 give in real riding conditions? A: Most riders can expect around 25–30 km/l depending on traffic and riding style. Q: Is the Aprilia RS 457 a good upgrade from bikes like R15 or RC 200? A: Yes, many riders consider it as a next step because of the twin-cylinder engine and higher power, but the jump in performance is noticeable. Q: Is the Aprilia RS 457 beginner-friendly? A: It can be handled by beginners with care, but it may feel powerful for someone with no prior riding experience. Q: Does the Aprilia RS 457 heat up in traffic? A: Yes, like most sport bikes, engine heat is noticeable in slow-moving traffic. Q: Is the Aprilia RS 457 comfortable for long rides? A: It is manageable on highways, but the sporty seating position may cause discomfort on longer trips. | Q: What is the engine capacity of the KTM 50 SX? A: It has a 49.9 cc 2-stroke engine. Q: What kind of transmission does it use? A: The KTM 50 SX has a single-speed automatic transmission. Q: How is the KTM 50 SX started? A: It uses a kick-start. Q: Does it have a clutch? A: Yes — a centrifugal (adjustable) clutch, so the rider doesn’t have to use a manual clutch lever. Q: What is the fuel tank capacity? A: The fuel tank capacity is 2.3 litres. Q: What is the seat height? A: The seat height is 653 mm. Q: What is the weight of the bike? A: The dry (or “without fuel”) weight is about 43.5 kg for recent models. Q: What kind of suspension does the KTM 50 SX use? A: It comes with WP XACT suspension — a 35 mm upside-down fork in the front and a WP mono-shock at the rear. Q: What brakes does it have? A: It has disc brakes both at the front and rear, each 160 mm. Q: What power does the KTM 50 SX produce? A: The KTM 50 SX produces around 5.3–5.4 PS at ~11,500 rpm. Q: Is the KTM 50 SX road legal? A: No — it's designed for off-road / motocross use, not for street-legal riding. Q: What kind of clutch does it have for young riders? A: It uses a centrifugal clutch, which automatically engages at high RPM — good for beginners or young riders who don’t manually operate a clutch. Q: What is the ground clearance? A: The ground clearance is 233 mm. Q: Is there a guarantee or warranty for KTM 50 SX? A: According to specs, it has a 2-year standard warranty. Q: What is the typical maintenance challenge or issue to watch for? A: Some owners report carburetor tuning issues |
| Fuel System | Fuel injection | — |
| Price Variants | STD | 422229 GP Replica | 437228 | | 475000 |
| Pros | Powerful 457 cc parallel-twin engine delivers strong acceleration and good mid-range punch. Smooth 6-speed gearbox with slipper clutch makes shifting crisp and rider-friendly. Dual-channel ABS and strong disc brakes (front + rear) give good stopping confidence, even in wet or tricky conditions. Upside-down front forks and adjustable rear suspension provide a good balance of comfort and handling, suitable for both city streets and open roads. 17" alloy wheels with wide tyres give excellent grip and stability during cornering or highway cruising. Full-LED lighting and 5" TFT digital instrument cluster offer modern feel and better visibility / readouts. Riding modes and traction control add versatility for different road conditions (city, rain, highways). Relatively manageable wet weight for a twin-cylinder bike makes it more nimble in traffic than heavier big bikes. | Very Lightweight: Makes it easy for young riders to handle and build confidence. Automatic Transmission: The centrifugal clutch and automatic gearbox simplify riding for beginners. Adjustable Suspension: High-quality WP fork and shock can be tuned to rider weight and track conditions. Racing‑Oriented Build: Frame and components are derived from KTM’s full-size SX range, giving a race-ready feel. Power-Reduction Kits Available: Helps beginners by limiting power until they’re ready for more. Good Cooling: Liquid cooling ensures the engine stays healthy even under hard off‑road use. Tool-Free Adjustability: Seat height, suspension, and other parts can be adjusted without special tools. |
| Starter | Self start | — |
| Transmission | 6-speed manual | Manual |
