I finally replaced the all-season tires with proper summer tires on my 17"x7.5" NM RSe05 wheels.
Finding a reasonably-spec'd 225/45R17 tire in North America was a greater challenge than I anticipated. My first choice, Goodyear Eagle F1 Asymmetric 5 (Fuel A / Wet B / Noise 70dB for 225/45R17 94Y fitment) does not appear to be available in sizes smaller than 19" on this side of the pond. I could find 1 vendor for my second choice, Goodyear Eagle F1 Asymmetric 3 (Fuel A / Wet B / Noise 70dB for 225/45R17 94Y fitment), but they didn't have any in stock and did not have an ETA for getting more.
I wound up getting a set of
Hankook Ventus S1 evo3 K127B in 225/45R17 94Y XL fitment (Fuel B / Wet A / Noise 70dB)--but found only 1 place in California that had any in stock via eBay. The K127B is the run flat variant which, shockingly, has slightly better ratings for EV use than the non-run flat model in the same fitment (Fuel C / Wet A / Noise 72dB). The
Ventus S1 evo3 page on Hankook's UK site has a 'specifications' section at the bottom showing the EU labels for all fitments.
I have about 384 miles on these tires now, and I am generally quite happy with them.
- Grip is excellent in both straight-line acceleration and cornering, with reduced intervention of traction control and reduced torque steer effects (the latter likely due to the wider contact patch, which also increases confidence at higher cornering speeds). This was a key area of improvement I was looking for over the stock size & over the all-seasons I previously had on these wheels. So far, these tires have ticked that box quite nicely.
- They were quieter during their first 100 miles, but sound levels after initial break-in are quite acceptable for most scenarios. Practically silent on smooth/freshly paved surfaces, with a bit more noise evident on textured streets and grooved highways. Good enough for my purposes.
- Ride comfort is reduced. The stiff & heavy run flat construction communicates road imperfections and bumps to the cabin much more readily.
- Efficiency is generally better than the Michelin All-Seasons, but not quite as good as the OE-supplied Ventus S1 evo3 in non-run flat 205/45R17 88W XL fitment (Fuel A / Wet A / Noise 68dB). This basically aligns with my expectations. In a non-scientific comparison, I averaged 4.5 mi/kWH in mixed driving for the first 215 miles on these Kumhos versus 4.2 mi/kWH average for the preceding 252 miles on 205/50R17 Michelin Pilot Sport A/S4 tires on stock Roulette wheels. I will soon add a new post to the Range Efficiency Under Various Conditions & Cargo thread with today's highway range test results, but here's how they compare:
- 225/45R17 Michelin Pilot Sport All Season 4 on NM Engineering RSe05 : 3.49 mi/kWH
- 225/45R17 Hankook Ventus S1 evo3 K127B on NM Engineering RSe05 : 3.59 mi/kWH
- 205/45R17 Michelin Pilot Sport All Season 4 on MINI Roulette Spoke : 3.66 mi/kWH
- 205/45R17 Hankook Ventus S1 evo3 on MINI Roulette Spoke : 4.19 mi/kWH