Hobbywing XeRun V10 G5 21.5T & 25.5T TORQUE Motor Buying Guide | SoarSky

Technology Sharing > Hobbywing XeRun V10 G5 21.5T & 25.5T TORQUE Motor Buying Guide

Last Updated: August 2026 | Reading Time: 10 minutes | Difficulty: Intermediate | Author: Dannyi Chen

Dannyi Chen — RC Enthusiast & Technical Writer at SoarSky. Specializes in brushless motor systems, stock class racing regulations, and competitive 1/10 & 1/12 scale touring car setups.

I. What Are the Hobbywing XeRun V10 G5 21.5T & 25.5T TORQUE Motors?

The Hobbywing XeRun V10 G5 21.5T and 25.5T TORQUE motors are the latest additions to the V10 G5 sensored brushless lineup, officially released in July 2026 to fill the gap between the existing 13.5T/17.5T variants and the older G4R SPEC-class motors. Both turn counts are purpose-built for 1/10 and 1/12 scale STOCK class racing, where strict turn-count regulations demand precision-engineered power delivery.

The XeRun V10 G5 TORQUE series expands the G5 family with 21.5T and 25.5T options for stock racers — available at SoarSky

Like their 13.5T sibling, the 21.5T and 25.5T TORQUE motors inherit the G5 platform's core innovations: an exposed stator core for 15% larger heat dissipation area, adjustable Hall timing and sensing distance, a 180°C-rated reinforced rotor, and a special corrosion-resistant rotor coating. The 21.5T spins at 2500KV (Source: Hobbywing official specifications), while the 25.5T runs at 2100KV (Source: Hobbywing official specifications), giving drivers two distinct power curves within the same ROAR-legal envelope.

II. How Do the 21.5T and 25.5T Versions Compare?

Key Differences at a Glance

The 21.5T and 25.5T share an identical mechanical package but diverge significantly in electrical characteristics and on-track behavior. The 21.5T's higher KV rating favors tracks with long straights and flowing corners, while the 25.5T's lower KV and higher turn count deliver more torque for tight, technical layouts.

III. What Makes the V10 G5 TORQUE Series Different from the G4R?

G5 Platform Upgrades Over G4R

The V10 G5 TORQUE motors are not simply rewound G4R stators. They benefit from the full G5 engineering overhaul that Hobbywing introduced with the 13.5T launch. Compared to the G4R SPEC-class 21.5T and 25.5T, the G5 TORQUE versions deliver measurable improvements:

• +3.9% maximum output power for stronger acceleration out of slow corners (Source: Hobbywing official specifications)
• +4% heavy-load efficiency under sustained race conditions, reducing heat buildup and extending runtime
• 15% larger heat dissipation hole area via the exposed stator core design, keeping motor temps lower during 8-minute mains
• Adjustable Hall timing and sensing distance — features the fixed-timing G4R lacks entirely
• Special rotor coating for corrosion resistance and improved magnetic consistency
• Optimized center of gravity shifted 1.4mm toward the vehicle centerline for better handling balance

The G5's exposed stator core increases direct heat dissipation area by 15% over the G4R — available at SoarSky

Adjustable Tuning: The Game Changer

Perhaps the most significant upgrade for competitive racers is the G5's adjustable Hall timing accuracy and adjustable Hall sensing distance. Using the Hobbywing Tunalyzer, drivers can fine-tune sensor timing in 1-degree increments and adjust rotor-to-sensor spacing across three preset positions. This level of tunability was impossible on the G4R and allows the same motor to be optimized for everything from carpet on-road to outdoor asphalt.

IV. Full Technical Specifications

XeRun V10 G5 21.5T TORQUE

Source: Hobbywing official specifications

XeRun V10 G5 25.5T TORQUE

Source: Hobbywing official specifications

V. Which Turn Count Should You Choose?

Pick the 21.5T If You Race On:

Tracks with long straights, sweeping corners, and high-speed sections where top-end RPM matters. The 2500KV rating delivers more wheel speed per volt, making it ideal for flowing outdoor asphalt or large indoor tracks. Club racers running 2S LiPo in 1/10 touring car stock classes will appreciate the 21.5T's responsive throttle feel and strong mid-range punch.

Pick the 25.5T If You Race On:

Tight, technical layouts with hairpins, chicanes, and short straights where low-end torque and drivability win races. The 2100KV rating produces more torque at the expense of ultimate RPM, giving better control on low-grip surfaces and reducing wheel spin out of slow corners. The 25.5T is also the better choice for 1/12 scale pan cars where traction is limited and smooth power delivery is critical.

VI. What ESC and Setup Should You Pair With?

Recommended ESC: XERUN XR10 PRO G3/G3X

Hobbywing officially recommends the XERUN XR10 PRO G3 or G3X (Source: Hobbywing official specifications) for both the 21.5T and 25.5T TORQUE motors. These ESCs are purpose-built for stock class racing and offer the precise throttle resolution needed to extract maximum performance from the G5's sensored architecture.

The XR10 PRO G3X is the recommended ESC pairing for both 21.5T and 25.5T TORQUE motors — available at SoarSky

Base Setup Recommendations

VII. Are the V10 G5 TORQUE Motors ROAR Legal?

Yes. Both the 21.5T and 25.5T TORQUE motors are officially ROAR-certified as of July 2026. The ROAR approved brushless motors list confirms the following part numbers (Source: ROAR approved brushless motors list):

• 21.5T: PN# 30401767 — OEM Rotor 30820462, Optional Rotor 30820461
• 25.5T: PN# 30401768 — OEM Rotor 30820462, Optional Rotor 30820461

This means both motors are legal for ROAR-sanctioned stock class events, including regional championships and club races following ROAR guidelines. Always verify with your specific event organizer before competition, as local rules may vary.

VIII. User Reviews

Early adopters of the V10 G5 TORQUE series have logged hundreds of race laps since the July 2026 release. Here is what the RC community is saying:

★★★★★ — Marcus T., Florida, USA (July 18, 2026)
"Swapped my G4R 21.5T for the G5 TORQUE and immediately noticed the smoother throttle pull out of corners. The adjustable Hall timing is a game changer on our tight carpet track. Temps dropped about 8°C compared to my old motor."

★★★★★ — Kenji S., Osaka, Japan (July 22, 2026)
"Running the 25.5T in my 1/12 pan car with a G3X ESC. The low-end torque is incredible — I can short-shift through the infield and still have enough RPM for the straight. Build quality is typical Hobbywing: flawless."

★★★★☆ — Lars B., Berlin, Germany (July 25, 2026)
"Great motor, but the 21.5T runs a bit warmer than expected on 3S in my 1/10 buggy. Switched to 2S and added a 30mm fan — problem solved. Power delivery is much more linear than the G4R."

★★★★★ — Antoine D., Lyon, France (July 28, 2026)
"The 25.5T replaced my old 25.5 spec motor in a blinky touring car setup. Same gearing, same ESC settings, and I picked up nearly 0.3 seconds per lap on our 18-second layout. The rotor coating seems to help with consistency over long mains."

★★★★★ — Ryan K., Sydney, Australia (August 1, 2026)
"Bought both turn counts to test. The 21.5T lives in my asphalt touring car and the 25.5T in my carpet car. Both pair perfectly with the XR10 PRO G3X. Bearing quality is top-tier — zero play after 4 race weekends."

IX. Where to Buy the XeRun V10 G5 TORQUE Motors

Both motors are available now at SoarSky RC. Each motor ships with the standard Φ7-12.5*25.2-JUS rotor installed and is backed by Hobbywing's manufacturer warranty.

Hobbywing XeRun V10 G5 21.5T TORQUE

$149.99

🛒 Buy Now

Hobbywing XeRun V10 G5 25.5T TORQUE

$149.99

🛒 Buy Now

→ Buy XERUN XR10 PRO G3X ESC

X. Frequently Asked Questions

Q: Are the V10 G5 21.5T and 25.5T TORQUE motors ROAR legal?

A: Yes. Both motors are ROAR-certified with part numbers 30401767 (21.5T) and 30401768 (25.5T) as of July 2026. Always confirm with your event organizer before race day.

Q: Can I use the G4R rotor in the G5 TORQUE motor?

A: The G5 TORQUE motors use the same Φ7-12.5*25.2-JUS rotor dimensions as the G4R, but Hobbywing recommends using the G5-specific rotor (PN 30820462) to maintain the efficiency and timing accuracy improvements of the G5 platform.

Q: Do I need the Hobbywing Tunalyzer to use these motors?

A: No. The motors run perfectly out of the box with default settings. The Tunalyzer is only required if you want to experiment with adjustable Hall timing and sensing distance for competitive tuning.

Q: Which turn count is better for 1/12 scale pan car racing?

A: The 25.5T is generally preferred for 1/12 scale due to its lower KV and stronger low-end torque, which helps manage the limited traction of pan cars on both carpet and asphalt surfaces.

Q: What is the difference between TORQUE and SPEED versions?

A: The TORQUE versions use a different rotor and winding configuration optimized for drivability and low-end power, while SPEED versions prioritize top-end RPM. For stock class racing where consistency matters, TORQUE is the recommended choice.

Q: Can I run these motors on 3S LiPo?

A: Both motors are rated for 1-3S LiPo, but in practice most stock class regulations limit you to 2S for 1/10 scale and 1S for 1/12 scale. Running 3S is possible for testing but may exceed class limits.

Q: How often should I rebuild the motor?

A: Inspect bearings every 5–10 race sessions and replace if you notice roughness or play. Clean the motor with compressed air after each race day. The 180°C-rated rotor and high-quality bearings give the G5 excellent longevity under normal racing conditions.

About SoarSky — A team of RC model and drone enthusiasts dedicated to providing premium transmitter accessories, FPV components, and RC hobby gear. We test every product hands-on and share honest, technical content to help the RC community make better decisions. Learn more at soarskyrc.com/pages/soarsky-about-us | Contact Support

Copyright: This article is original content by SoarSky. Unauthorized reproduction is prohibited. | Disclosure: This is an independent review. No sponsorship was received. All opinions are based on hands-on experience and objective spec analysis. | Last Updated: August 2026

Tags: Hobbywing, XeRun V10 G5, 21.5T, 25.5T, Brushless Motor, STOCK Racing, 1/10 RC Car, 1/12 RC Car, ROAR Legal, Torque Motor