This new model introduces a completely updated kinematics of the Zero Suspension System, capable of offering better performance thanks to greater support in the middle phase of the travel — right where it is needed most — for the benefit of a faster bike, with greater control and better initial sensitivity of the suspension.
FORWARD GEOMETRY SPECIFIC FOR THE DOWNHILL
Longer reach and slacker head angles: directly inherited from World Cup racing. Key design choices you'll immediately feel when you put the bike through its paces.
The new Summum already offers extremely race-oriented geometry as standard. For more experienced riders who want to further customize the setup or adapt the bike to specific tracks or personal preferences, additional geometry is available. up to 27 possible configurations thanks to adjustable headsets, flip chips on the lower shock mount and adjustable rear dropouts.
- Headset with three-position reach adjustment (standard and ±5 mm).
- Lower flip chip for bottom bracket height adjustment ±5 mm and angles ±0,35°.
- Adjustable rear dropouts ±5 mm (450 mm or 460 mm), compared to the standard 455 mm.
STEALTH ALLOY FRAME
Made from Stealth Alloy with optimized shapes to offer the best balance between stiffness and compliance, the new Summum frame has been completely redesigned following the guidelines and development of prototypes tested by the MFR team.
New sealed bearings
The new Summum adopts a unified bearing sizing on all rotation points, specific hardware and
rubber seals for better protection from external agents and longer life.
Internal cable routing
Guided internal cable routing system that simplifies installation and eliminates unwanted noise.
Dedicated rubber protections
Redesigned guards on the rear triangle, down tube, and bottom bracket reduce noise and protect the frame from impacts and debris. Additional down tube protection prevents damage during chairlift rides or when loading into vehicles.
GEOMETRY
| Size | M | L | XL |
| A Seat tube length | 400 mm | 400 mm | 400 mm |
| B Top tube length | 710 mm | 740 mm | 770 mm |
| C Bottom bracket drop | -5 mm | -5 mm | -5 mm |
| D Bottom Bracket Height | 350 mm | 350 mm | 350 mm |
| E Chainstay Legth | 455 mm | 455 mm | 455 mm |
| F Seat Tube Angle. Actual | 78° | 78° | 78° |
| G Seat Tube Angle. Effective | 70° | 70° | 70° |
| H Head Tube Angle | 62,5° | 62,5° | 62,5° |
| I Fork offset | 52 mm | 52 mm | 52 mm |
| J Wheelbase | 1285,4 mm | 1315,4 mm | 1345,4 mm |
| K Head tube length | 120 mm | 120 mm | 120 mm |
| L Reach | 450 mm | 480 mm | 510 mm |
| M Stack (Height) | 642,6 mm | 642,6 mm | 642,6 mm |
HEADSET CUP REACH ADJUST +/- 5mm
CHAINSTAY LENGTH ADJUST +/- 5mm
SHOCK FLIP CHIP ADJUST +/-5mm BB height, 0,35º angles
