General information
| Brand | Kalkhoff |
| Model | ROCKBREAKER 21 G Altus |
| Weight | - |
| Released on the market | 2012 |
| For women | No |
| For kids | No |
| Frame material | Aluminum Alloy |
| Frame type | Closed |
| Collapsible frame | - |
| Color | Black, Red |
| Fork type | Suspension |
| Shock absorber type | - |
| Shock absorber pressure | - |
| Fork name | SR Suntour M3010-AL |
| Wheel drive | Rear |
| Drive type | Chain |
| Transmission type | With an external switch |
| Number of speeds | 21 |
| System name | - |
| Cassette name | - |
| Front derailleur gears name | - |
| Rear derailleur gears name | - |
| Shifters type | Trigger |
| Shifters name | Shimano Altus |
| Front brakes | Rim mechanical |
| Front brakes name | Promax |
| Rear brakes | Rim mechanical |
| Front brakes name | Promax |
| Number of wheels | 2 |
| Wheels diameter | 26 " |
| Double rim | - |
| Rim material | Aluminium |
| Rims name | - |
| Tyres pattern | Semi slicks |
| Tyres name | ATB |
| Handlebar type | Direct |
| Handlebar name | Direct |
| Seat type | Travel |
| Seat suspension | No |
| Seat name | ATB |
| Pedals type | Platform |
| Pedals name | - |
| Front panel | Yes |
| Rear panel panel | Yes |
| Trunk | No |
| Rearview mirror | No |
| Horn | No |
| Basket | No |
