Aprilia SL 750 Shiver (2015-16) vs Aprilia SMV 900 Dorsoduro (2018) vs Aprilia RC 125 (1977-82) vs Aprilia RS4 125 (2019-20) vs Aprilia RX 125 Six Days ModelM (1991-92) vs Aprilia RX 125 (1983-84) vs Aprilia RX 125 Six days Model L (1988-90)

Comparison technical specifications

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Make:	Aprilia	Aprilia	Aprilia	Aprilia	Aprilia	Aprilia	Aprilia
Model:	SL 750 Shiver	SMV 900 Dorsoduro	RC 125	RS4 125	RX 125 Six Days ModelM	RX 125	RX 125 Six days Model L
Years:	2015-16	2018	1977-82	2019-20	1991-92	1983-84	1988-90
Engine:	Four stroke, longitudinal 90°V twin, DOHC, 4 valves per cylinder	Four stroke, longitudinal 90°V twin, DOHC, with mixed gear/chain timing system,4 valves per cylinder	Single cylinder, two stroke	Four stroke, single cylinder, DOHC, 4 valves	Single cylinder, two stroke, Rotax 123 with Gilardoni 2 cylinder/head	Single cylinder, two stroke	Single cylinder, two stroke, Rotax 123 with Gilardoni cylinder/head
Capacity:	749 cc / 45.7 cu-in	896.1 cc / 54.6 cu-in	125 cc / 7.6 cu in	124.8 cc / 7.6 cu in	124.8 cc / 7.6 cu in	124.8 cc / 7.6 cu in	124.8 cc / 7.6 cu in
Cooling System:	Liquid cooled	Liquid cooled	Air cooled	Liquid cooled	Liquid cooled	Liquid cooled	Liquid cooled
Starting:	Electric	Electric	Kick	Electric	Kick	Electric and kick	Kick
Transmission:	6 Speed	6 Speed	6 Speed	6 Speed	6 Speed	6 Speed	6 Speed
Final Drive:	Chain Transmission ratio: 16/44	Chain	Chain	Chain: 60/13 (4.61)	#520 Chain, 12T to 17T pinion gear, 49T spur gear	Chain	#520 Chain, 12T to 17T pinion gears, 49 T spur gear
Front Suspension:	Ø43 mm upside-down fork.	Upside-down fork, stanchions Æ 41 mm. Adjustable hydraulic rebound damping and spring preload.	Telescopic fork	Ø41 mm Upside down fork	Marzocchi upside down fork	Hydraulic telescopic fork	Marzocci upside down fork
Rear Suspension:	Aluminium alloy swingarm with reinforcement truss. Hydraulic shock absorber adjustable in spring preload and rebound damping.	Aluminum alloy swingarm. Hydraulic shock absorber with adjustable extension and spring preload	Swingarm, dual shocks with coil springs	Asymmetric swingarm with monoshock	Swingarm with single shock absorber, Aprilia Progressive System with fully adjustable Boge Sachs shock absorber	Swingarm with single shock absorber	Swingarm with single shock absorber, Aprilia Progressive system with compression extension, adjustable, Boge Sachs shock absorber
Front Brakes:	2 x Ø320 mm discs, 4 piston caliper	2 x 320 mm discs, stainless floating discs. Radial, four-piston callipers. Metal braided brake hose	Drum	Single 300 mm disc, 4 piston caliper	Single disc, 250 mm	Drum	Single disc, 250 mm
Rear Brakes:	Single Ø245 mm disc, 2 piston caliper	Single 240 mm disc, Single piston calliper. Metal braided line.	Drum	Single 218 mm disc, 1 piston caliper	Single disc, 220 mm	Drum	Single disc, 220 mm
Front Tyre:	120/70 ZR17	120/70 ZR17	21 in	110/80 17	90/90-21	3.00-21	90/90-21
Rear Tyre:	180/55 ZR17	180/55 ZR17	18 in	130/70 17	120/90-18	4.00-18	120/90-18