Aprilia's V-twin to V4 transition
2009 reset
Aprilia replaced the V-twin RSV1000R with the V4 RSV4 in 2009. Same flagship superbike slot, totally different engine. The RSV4 is a 65° V4 (Aprilia's first V4) which has more revs, more peak power, and is sharper than the V-twin Mille. Aprilia kept the V-twin in the Tuono and other models for a few more years before fully transitioning to V4 across the sport range.
RSV Mille → RSV1000R (2004)
+13bhp, refined
RSV Mille (1998-2003): 998cc, 128bhp. RSV1000R (2004-2009): same 998cc engine but with revised heads, larger throttle bodies, slipper clutch — 141bhp at peak. Same chassis architecture, more refined package. The RSV1000R is the buy on used market — better in every measurable way.
Why V-twin → V4 in 2009
WSBK rules + competition
The 2009 RSV4 was Aprilia's WSBK weapon — 1000cc V4 to compete with Honda CBR1000RR (inline-four), Yamaha R1 (cross-plane four), Suzuki GSX-R1000. The V-twin couldn't keep up on power. Aprilia kept the V-twin in the Tuono naked for road duty until the V4 Tuono replaced it in 2011. Now no Aprilia V-twin sport in the lineup.
vs Ducati 998 (contemporary)
Italian rivals
Ducati 998 (1995-2002): 998cc 90° V-twin, ~123bhp. RSV Mille (1998-2003): 998cc 60° V-twin, 128bhp. Same money roughly, slightly different V-twin character. RSV Mille had more rev character (60° crank); Ducati had the WSBK championship pedigree. Both moved to V4 by 2018 (Ducati Panigale V4) / 2009 (Aprilia RSV4).
Real cost trajectory
+24% real (vs RSV4 Factory)
£11,499 RSV1000R in 2006 (£19,300 today) → £23,995 RSV4 Factory in 2026. Modern V4 has 76bhp more, full electronics, race-spec components. Used market in 2026: RSV Mille standard £2.5-4k, RSV1000R £3.5-6k for clean low-mile. Both appreciating fast as Italian collector market heats up.
Rider aids count (1998 → 2026)
1 → 12+
RSV Mille had FI as the only rider aid. RSV1000R added slipper clutch but no ABS, no TC, no electronics. 2026 RSV4 Factory has cornering ABS, traction control, launch control, anti-wheelie, slide control, ride modes, IMU, quickshifter, Öhlins electronic suspension, lap timer, full TFT. Total transformation.
Cheapest way in
£2.5k
A clean RSV Mille from 1998-2002. 128bhp 60° V-twin (Rotax-built), trellis frame, single-sided swingarm, fuel injection. The cheapest path to an Italian V-twin superbike. Pay attention to fuel pump (early bikes), reg/rec, fork seals. Prices have risen 30%+ over 2020-2025 as Italian bike collector market heats up.
