Extention ASP frame

With it's roots in street-trials, Extention have branched out in the past couple of years to full suspension bikes. While this endeavour began with the carbon Eurus, a robust alloy frame has followed. The ASP is a beefier version of the Ace 150, designed with one goal: maximum freedom in the bike park. It’s not a machine optimised specifically for DH, FR, or enduro - but it’s built to be fun in all of them and certified to category 5 levels for your peace of mind. Travel depends on the setup with recommendations for 170mm up to 200mm.

The frame features a single pivot design with a CNC machined linkage running sealed cartridge bearings throughout. The seat tube is compatible with dropper posts up to 180mm in length. The beefy head tube incorporates a ZS56 semi-integrated headset top and bottom with the lower cup featuring a tapered cartridge bearing. This headset is included with the frame but not fitted in case you want to run your own headset.

The tubing features internal hose routing for a clean look and an integrated ISCG05 chain guide mount. Minimum brake rotor size is 180mm thanks to a single piece post mount dropout. Dropouts are spaced at 148mm x 12mm and are compatible with UDH hangers. With strength in mind, the frame weighs around 5040g in size M.

The suspension layout uses a strongly progressive leverage curve - from roughly 3.4:1 at the start to about 2.0:1 at bottom-out. In practice this gives sensitivity on small bumps and good traction, clear mid-stroke support under hard pedalling and on landings, and strong bottom-out resistance without having to over-stiffen the shock. Anti-squat around SAG is close to neutral (about 100–110% depending on gear), so the bike doesn’t bob excessively when you’re pushing on the pedals, while still staying active on rough climbs.

Under braking, anti-rise goes from near-neutral around SAG to lower values deeper in the travel, which helps the rear wheel stay in contact over small chatter and in steep sections instead of stiffening up. The rear triangle lengthens up to around SAG, then shortens in the deeper part of the stroke. Pedal kickback is low in gears typically used in the bike park, with higher values showing up mainly in the largest climbing cog.

The suspension system allows for 3 configurations:

• 200 mm travel with a 250x75 shock using DH top mount
• 180 mm travel with a 230x65 shock using FR top mount
• 170 mm travel with a 230x60 shock using FR top mount

Recommended shocks that pair well with the suspension kinematics:

• Linear DH: DVO Jade X, RockShox Vivid Coil, Öhlins M.2 Coil
• Progressive for bike parks: RockShox Vivid Air, Öhlins TTX M.2 Air, DVO Topaz

Supplied with:

• Headset with sealed bearings, includes crown race for 1 1/8" and 1.5" steerer tubes
• CNC milled seat clamp
• UDH mech hanger and 12mm axle
• Chain tensioner mount
• 250mm and 230mm damper top mounts
• Rubber gromits for cable routing
• Rubber chainstay protector
• Spare small rubber chainstay protector to install on chainstay as you see fit 
• Shock not included and as of now, we cannot supply suspension with this frame