Quick Summary
The ROCKBROS MT400 is a hardtail mountain bike with a 29-inch aluminum frame, hydraulic disc brakes, and an oil-spring suspension fork with remote lockout and preload adjustment. Its listed configuration pairs a 36T crankset with an 11-50T cassette and uses 29 x 2.1-inch tires.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Frame | Aluminum frame; the listed size is 21 inches. Confirm that this size and the fit guidance suit the rider. |
| Listed rider fit | Listed for riders 5’9″ to 6’6″. Use this as a starting point and confirm fit for the individual rider. |
| Color | Luminous Ivory. |
| Wheels and tires | 29-inch wheels with 29 x 2.1-inch tires. Check size and compatibility when choosing replacement tires. |
| Drivetrain | 10-speed setup with an 11-50T cassette and 36T crankset. |
| Fork | Oil-spring suspension fork with remote lockout and preload adjustment. |
| Brakes | Hydraulic disc brakes. Confirm exact component compatibility before sourcing replacement parts. |
| Rims and hubs | Double-wall alloy rims and bearing hubs. |
| Warranty | Listed with a 1-year manufacturer warranty; check the applicable terms for coverage details. |
What to Compare Before Buying
- Frame fit: The listed frame is 21 inches, with a stated rider range of 5’9″ to 6’6″. Consider the rider’s fit needs rather than using wheel diameter alone to choose a frame.
- Gearing: Check whether the 36T crankset and 11-50T cassette provide the gear range you want for your routes.
- Tire size: Confirm that 29 x 2.1-inch tires suit your needs and that any replacement tires match the wheel and bike configuration.
- Components: If you expect to replace or service parts, confirm compatibility with the installed fork, drivetrain, and hydraulic brakes before selecting components.
Compatibility, Size and Fit
The listed rider-fit range is 5’9″ to 6’6″, but rider height alone does not establish a comfortable or appropriate fit. Check the 21-inch frame against the rider’s fit preferences and the bike’s setup guidance. The 29-inch wheel size is separate from frame sizing.
For replacement or service parts, match the part to the components actually fitted to this bike. Confirm tire dimensions and drivetrain, fork, and brake compatibility rather than relying on the bike type or brand alone.
Before You Decide
Confirm that the 21-inch frame and listed rider-fit range suit the rider. Check the 29 x 2.1-inch tire size, 10-speed gearing, and component compatibility for any planned replacements. Follow the bike’s setup and operating instructions before riding.
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