Bonzai GRS50 – City/Hybrid/Flat Bar Gravel Bike - Text Review

The GRS50 uses a smooth-welded Aluminium 6061 frame with internal cable routing for a clean appearance. It is also dropper-post ready, adding useful versatility for riders who want to customize the bike. Its relaxed endurance geometry provides a more upright and comfortable road-riding position. The bike is offered in M and L sizes, covering riders from approximately 168 to 186 cm. The 700C wheel platform keeps the design efficient and road-oriented. Overall, the frame combines lightweight construction with practical everyday versatility.

The GRS50 uses an 18-speed Shimano and Microshift drivetrain designed for varied road riding. The Shimano Alivio M3100 shifter works with the Microshift FD-T492B front derailleur and Shimano Alivio RD-R3100 rear derailleur. Its Shimano MT210-2 46/30T crankset provides useful gearing for both faster riding and climbs. The Shimano HG200 11-36T cassette offers a broad range of ratios for mixed terrain. A KMC Z9 chain completes the 9-speed drivetrain. This setup makes the GRS50 suitable for commuting, fitness rides and light gravel adventures.

Comfort is a major focus of the GRS50's design. Its relaxed endurance geometry places the rider in a more upright position than an aggressive road bike. The aluminium frame keeps the bike responsive while the 700×32C tires provide useful cushioning over rougher surfaces. The lightweight saddle is designed to keep the overall setup efficient without adding unnecessary weight. The 620mm alloy handlebar provides a stable and controlled riding position. Together, these features make the GRS50 well suited to longer daily and fitness rides.

The GRS50 is equipped with Tektro HD275 hydraulic brakes for strong and controlled stopping performance. The braking system uses a 180mm front rotor and 160mm rear rotor for dependable braking across varied conditions. Its 620mm alloy handlebar provides a stable steering platform for city and gravel riding. The 70mm alloy stem keeps the cockpit practical and responsive. The sealed cartridge headset supports smooth steering control. Overall, the cockpit and braking system provide confident handling for everyday riding and longer routes.

The GRS50 uses 700C wheels fitted with Kenda Kwest K193 700×32C tires. These tires provide a good balance between efficient rolling and comfort on mixed road surfaces. The double-wall aluminium alloy rims offer a durable wheel platform for daily use. MY-607BQ sealed-bearing quick-release hubs provide smooth operation and convenient wheel removal. The lightweight saddle complements the bike's endurance-oriented design. Overall, the wheel package is well suited to commuting, fitness and light gravel riding.