Author Impulse 27.5 ASL 2021-22 vs Felt VR 40 2020

Speed	24	--
Frame	Alloy 6061 27.5" (ASL)	Felt Variable Road Disc FLite custom butted aluminum, hydroform smooth welded construction, BB386 bottom bracket shell, 12 x 142 mm with Syntace style thru axle, flat mount disc brake standard, replaceable rear derailleur hanger, internal mechanical cable routing
Stem	AUTHOR alloy	Devox Variable Angle, ±8¡/±16¡ rise, ¯31.8 mm, 43 cm: 70 mm, 47 cm : 80 mm, 51 cm: 90 mm, 54 - 56 cm: 100 mm, 58 cm: 110 mm, 61 cm: 120 mm
Handle Bar	AUTHOR 8° 640 / 660 mm	Devox Road Endurance, 65 mm reach, 12 5 mm drop, ¯31.8 mm, 43-47 cm: 380 mm, 51 cm: 400 mm, 54 - 56 cm: 420 mm, 58 - 61 cm: 440 mm
Fork	Front: RST Gila 27.5 ML lock out (100 mm)	Felt Variable Road UHC Advanced carbon fiber monocoque construction, size specific Control Taper carbon fiber steerer tube, integrated crown race, crown and blades. Flat mount disc standard, 12 x 100 mm thru axle
Seatpost	AUTHOR alloy (31.6)	Devox UHC Performance carbon fiber with microadjust head, ¯27.2 mm x 344 mm length
Grip	AUTHOR high density foam	--
Crankset	--	Shimano Tiagra, 50/34T,43 - 47 cm: 165 mm, 51 cm: 170 mm, 54 - 56 cm: 172.5 mm, 58 - 61 cm: 175 mm
Pedals	Resin	--
Chain	KMC Z8.3	KMC X-10 EPT, 10-speed
Shifters	SHIMANO Altus (24)	Shimano Tiagra 10-speed
Saddle	AUTHOR Fenix	Devox MIG
Headset	--	FSA integrated sealed cartridge bearing with Felt Variable Height Cone Spacers (20 mm PC, 4.5 mm aluminum), Felt top cap, 43 - 47 cm: IS-21, 1.125", 51 - 61 cm: No.42, 1.125 - 1.5"
Derailleur Front	SHIMANO TY700 (34.9)	Shimano Tiagra clamp-on, ¯31.8 mm
Derailleur Rear	SHIMANO Altus	Shimano Tiagra 10-speed long cage
Hub Front	QUANDO Disc 32 holes	Devox RSL3D, 11-speed, 12 x 142 mm thru axle, 6-bolt, 28H
Hub Rear	--	Devox RSL3D, 12 x 100 mm thru axle, 6-bolt, 28H
Spoke	Black steel	2.0 mm stainless steel
Cassette	--	Shimano 10-speed, 11-34T
Bottom Bracket	VP COMP cartridge	--

Front	AUTHOR Speed Master 27.5" × 2.00"	Vittoria Zaffiro folding, 700 x 28c
Rear	AUTHOR Speed Master 27.5" × 2.00"	Vittoria Zaffiro folding, 700 x 28c
Wheel / RIM	Rims: AUTHOR Xenon 27.5 32 holes	Devox Variable Road VR2.1, tubeless compatible 21 mm inner width, 23 mm depth

Front	TEKTRO disc hydraulic (6" rotors)	Tektro MD-C610 dual piston flat mount disc, 160 mm rotor
Rear	TEKTRO disc hydraulic (6" rotors)	Tektro MD-C610 dual piston flat mount disc, 160 mm rotor
Brake Lever	TEKTRO WS	Shimano Tiagra

Front	--	--
Rear	--	--

Colors

--

Crimson (Plasma)

Length	--	--
Weight	14 kg	--

Features	--	--
Additional Details	SIZE : 16", 18" HEAD PARTS: PRESTINE Integrated 1-1/8" CHAIN WHEEL : PROWHEEL 42-34-24 teeth 170 mm cranks FREE WHEEL: SHIMANO HG200-8 12-32 (8) SEAT CLAMP: AUTHOR (34.9)	Bar tape : Felt VelvetGel tape with 3M reflective base with reflective Felt Bubble-Tech F-Wing bar end plugs Bottom Bracket : Token BB386 with 24 mm bearings Seatpost Clamp : Felt single bolt, ¯31.8 mm Thru axle : Front: 12 x 100 x 123, thread: M12 x 1.5P x 16L, Maxle; Rear: 12 x 142 x 163 (163L + 9 head = 172 total), thread: M12 x 1.0P x 19L, Syntace