Electric Dirt Bike Upgrades & News

New Release: Torp TM50 Speed Motor For Surron Ultra Bee

The Torp TM50 Speed Motor is now available for the Surron Ultra Bee at Darwin EV, giving riders a purpose-built option for high-RPM performance and serious top-end power. While the TM50 platform already proved itself with the Pro version, the Speed variant is tuned differently — designed specifically for riders chasing higher RPM efficiency, stronger extended pulls, and maximum speed potential. If your Ultra Bee build leans toward street or high-voltage performance setups, this motor was built with you in mind. Why Torp Introduced the TM50 Speed Motor The Ultra Bee platform has two distinct rider profiles: Riders focused on torque-heavy, off-road performance Riders building higher-speed, high-voltage setups The TM50 Pro was engineered primarily for aggressive off-road torque delivery. The TM50 Speed shifts the focus upward in the RPM range. With a 97 KV rating and a 13,000 RPM ceiling, the TM50 Speed is optimized to: Carry power longer into the top end Improve sustained high-speed pulls Deliver stronger acceleration at higher vehicle speeds Scale well with increased voltage setups This isn’t just more power — it’s power delivered differently. ℹ️ See Full Specs Here › What Changes in Real-World Riding? Here’s what riders will actually feel: With the TM50 Speed: Stronger pull once you’re moving More aggressive high-speed acceleration Better performance in extended straight sections Higher ceiling for top-speed builds With the TM50 Pro: Stronger initial torque hit Better throttle modulation in technical terrain More control in low-speed off-road sections Greater torque-per-amp efficiency The difference isn’t about which motor is “stronger.” It’s about where in the RPM range the power is emphasized. TM50 Speed vs TM50 Pro: Which Motor Should You Choose? Choosing between them depends entirely on your riding style and build goals. Choose TM50 Speed If: You’re building a high-speed Ultra Bee You ride mostly street or open terrain You want stronger top-end pull You plan to run higher voltage (80V / 22S setups) You care more about sustained RPM than low-end snap The Speed motor performs well even on 72V, but higher voltage setups unlock its full potential. Choose TM50 Pro If: You ride tight trails or technical terrain You prioritize torque response at lower RPM You want maximum drive out of slow sections You focus on aggressive off-road riding The Pro version emphasizes torque bias and low-to-mid RPM efficiency. Voltage Matters Both motors are compatible with the stock Ultra Bee battery, but performance scales significantly with voltage. If you’re planning an 80V nominal (22S) battery setup, the TM50 Speed becomes especially compelling due to its high-RPM tuning. Higher voltage batteries allows the Speed motor to fully utilize its design and extend top-end performance. If you’re staying closer to stock voltage and ride mostly technical terrain, the TM50 Pro may be the more balanced choice. Is This Upgrade Worth It? For riders pushing beyond stock performance levels, the TM50 platform represents one of the most meaningful drivetrain upgrades available for the Ultra Bee. The key is choosing the version that matches how you actually ride. The Speed motor isn’t “better.” The Pro motor isn’t “stronger.” They’re tuned differently — and that distinction matters. Performance builds aren’t guesswork. Build it right. Explore the TM50 Lineup at Darwin EV Torp TM50 Speed Motor for Surron Ultra Bee Torp TM50 Pro Motor for Surron Ultra Bee