The Aprilia RS 660 (2025) is a sportsbike with 73.5 kW and a wet weight of 183 kg. That’s 402 kW per tonne, in the big-bore tier. Big tourers, 750–900 cc nakeds and big adventure bikes. Power can spin a cold or worn rear.
402kW/t
Not LAMS. Over 150 kW/t (or 25 kW for an electric bike), so learners and most provisional riders can't ride it. LAMS rules
For a mild, wet climate, ridden solo.
Twisty roads
Big-bore power and twisty roads work the tyre's shoulders hard. A sport road tyre adds lean grip and sharper steering, and still copes with rain.
Also consider: if you ride year-round, sport-touring.
Commuting
For commuting, a dual-compound sport-touring tyre is the safest all-round choice: excellent in the wet, quick to warm up, and it lasts. Its shoulders still handle big-bore-tier power comfortably.
Also consider: if you ride hard at weekends, sport.
Road + track days
Big-bore power and road + track days work the tyre's shoulders hard. A sport road tyre adds lean grip and sharper steering, and still copes with rain.
Also consider: optional track-day set, supersport.
Your owner’s manual, or the tyre sticker on the swingarm or chain guard, is the authority on sizes, load index and speed rating.
Sport road: character
Fit a matched pair
Run the same make and model front and rear. Tyres are designed as a pair, and mixing them changes how the bike steers and where it lets go. Rears usually wear out first; if you replace only the rear, match the front's model.
Scrub new tyres in
New tyres are slippery until the release agent wears off. Take the first 100–150 km gently, building lean angle gradually, and be extra careful in the wet and on painted lines.
Check pressures weekly, cold
Bike tyres lose air faster than car tyres and pressure changes the handling more. Check them cold, before you ride, against your owner's manual or the swingarm sticker, and add the pillion figure when two-up.
Replace by age as well as tread
Rubber hardens with age even when there's tread left. Check the DOT date code and replace tyres older than about five years, sooner if they're cracked.
402 kW per tonne (539 hp per tonne), from 73.5 kW and a 183 kg wet weight. With a 75 kg rider aboard it's 285 kW/t. That puts it in ratio's Big-bore tier for motorbikes.
120/70 ZR17 front and 180/55 ZR17 rear as standard. Check your owner's manual or the tyre sticker on the swingarm for your exact bike, including the load index and speed rating, and never fit lower.
For twisty roads, sport road tyres. Good options include the Dunlop SportSmart MK4, Pirelli Diablo Rosso IV, Metzeler Sportec 01. Fit the same model front and rear.
No. It's well over the LAMS limits, so learner and most provisional riders can't ride it.