Wheel and tire size - Alfa Romeo 4C Forums
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post #1 of 20 (permalink) Old 03-28-2019, 08:17 PM Thread Starter
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Wheel and tire size

Has anyone changed from 18/19 wheels to 17/18s and if so how was the ride quality? Here in Chicago the roads are so poor that a softer ride would be great! Particularly bad this year after the polar vortex!
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post #2 of 20 (permalink) Old 03-29-2019, 09:32 AM
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There is a fair number of users that have shifted from the 18/19 to 17/18. This change was mostly due to a broader range of tire options in the 17/18 configuration in the early years of the release. Things have improved over the years, but the 17/18 still offer better options especially in the +1 sizing. This shift has been quite critical for track based users....

The OEM sizing was 205/xx-17 and 235/xx-18, most of us have moved to +1 sizing, aka, 215/45R17 and 245/40R18.

As for road ride quality, it isn't going to miraculously make the 4C a smooth road going car. It does help a little, and I find that I have a lower chance to kill a tire/rim when I hit a massive pothole or curb. The other item is that the PZero's have a much higher tendency to tram-line, and with a different tire selection you can reduce that a lot.
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post #3 of 20 (permalink) Old 04-15-2019, 10:10 AM
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I have an LE car and want to keep the tires in their stock size.

I am currently running Michelin PS3s, but they are about due to be replaced. I wanted to go with Michelin PS4s, but the they are not available any longer in the size I need for the front (205/40/18).

Does anyone have a recommendation on an equally good tire that will perform like the Michelin PS4s? The car is used regularly around town, on road trips, with the odd track day thrown in (just for grins - not interested ion making it a track car).

If I have to go a size larger size to get an equivalent tire to the 4S, it sounds like 215/45/17 and 245/40/18s will work. Anybody disagree? Since its a Plus 1 fix, I assume the speedo reading will be essentially unchanged?

Thanks.
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post #4 of 20 (permalink) Old 04-15-2019, 10:39 AM
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Sorry - I just noticed I had the wrong size for the stock wheels. They are in fact 18 front, 19 rear.
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post #5 of 20 (permalink) Old 04-15-2019, 11:05 AM
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If the potholes aren't real "rim-breakers", you could invest that money in a set of quality coil-overs instead. Bilstein B16 for example. You'd preserve the nice looks, get smoother ride quality and increased handling at the same time. Just an idea!
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post #6 of 20 (permalink) Old 04-15-2019, 12:36 PM
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The wider sidewall definitely makes the ride slightly softer - but we're not talking Lexus here.

@sptcoupe , can you still snag some Michelin Pilot Super Sport off Tire Rack or though a local vendor? I know that a number of owners here and on other boards have been successful in sourcing those. Of course, the supply will be drying up.

Finding tires that fit the 18/19 to OEM size is a real PITA.

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post #7 of 20 (permalink) Old 04-15-2019, 01:33 PM
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I just order a set of Super Sports last week-end in the 18/19 combo (215/35-18, 245/40-19) from Tire Rack.

Called and talked to them first to verify they had the 215/40-18 size on hand, was told they has 6 of them left.

Act fast before they are gone.
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post #8 of 20 (permalink) Old 04-16-2019, 01:17 PM
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I never had anything except the stock Pirelli 18/19 combo on my 4C.
I think the size is 205/40-18 and 235/35-19.
Question, are the Michelin supersport will fit ? and are they better ? in what criteria ? Thanks
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post #9 of 20 (permalink) Old 04-17-2019, 04:35 AM
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I recently switched to Potenza RE71R with 215/18 front and 245/19 rear. Just wondering what tire pressure should I use for Normal driving still 26/29 psi? Also how about psi on track, for those of you that track with these same tires? These tires have way more grip than P Zero.
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post #10 of 20 (permalink) Old 04-17-2019, 05:29 AM
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Quote:
Originally Posted by 4Caddict View Post
I recently switched to Potenza RE71R with 215/18 front and 245/19 rear. Just wondering what tire pressure should I use for Normal driving still 26/29 psi? Also how about psi on track, for those of you that track with these same tires? These tires have way more grip than P Zero.
Same tires and similar sizes on 17/18 wheels. For street, the 26/29 works well. I dropped cold pressure 3-4 psi for the track which worked relatively well. That turns into around 29/32 hot IIRC. Others will have more experience and better advice for you on this point, I’m fairly certain. Wise idea to pump the tires back up before you drive home, but remember you will be reading hot pressures at that time.
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Last edited by 4Canada; 04-17-2019 at 05:54 PM.
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