| Attribute | Xmotos XB-21 × | Lem RX2 Motard × |
|---|---|---|
| General | ||
| Production from (year) | 2008 | 2007 |
| Make | Xmotos | Lem |
| Model | Xmotos XB-21 | Lem RX2 Motard |
| Category | Minibike, cross | Minibike, cross |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, two-stroke |
| Displacement (cm³) | 50 | 49.8 |
| Power (kw) | 2.5 | 9.2 |
| Cooling system | Air | Liquid |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 39 | 1.5 |
| Stroke (mm) | 41.4 | 0 |
| Gearbox | Automatic | 1-speed |
| Fuel control | - | Overhead Cams (OHC) |
| Ignition | - | Electronics with micro processor |
| Compression | 9.4:1 | - |
| Exhaust system | - | Expansion with silencer |
| Chassis | ||
| Front suspension | Inverted hydraulic Adjustable shock | Fixed marzocchi |
| Rear suspension | Adjustable Air /Oil shock Absorber | Fixed |
| Front brakes | Expanding brake (drum brake) | Single disc |
| Rear brakes | Expanding brake (drum brake) | Single disc |
| Frame type | - | Steel tubes with alluminium swing armi brake pedal and rear body |
| Front tyre | - | 90/90-10 |
| Rear tyre | - | 90/90-20 |
| Other | ||
| Starter | - | Electric & kick |
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 950 | 910 |
| Dry weight (kg) | 50 | 41 |
| Power/weight ratio | 0.05 | 0.2233 |
| Overall length (mm) | 1,320 | 1,300 |
| Seat height (mm) | 650 | 605 |
| Ground clearance (mm) | 150 | 210 |
| Performance | ||
| Fuel capacity (l) | 3 | 2 |