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Discussion Starter · #1 ·
Car comes with 185/55R15....how much taller can I go and not scrub? The car is brand new ( my second 500c ) so I will have to stay with the stoch 15" wheels. Just thinking with a taller tire I can squeeze a few more MPG's out on the highway.


I would be thankful for any input.

Dean
 

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just remember the speedometer/odometer will be thrown off so you will need to account for that.
here are some sizes to consider that will fit the fiat rim and should not rub (provided you are not lowering the car)

stock:
185/55-15 - 23" overall, 4" tall sidewall, 60mph indicated = 60 mph actual, 0% overdriven

alternatives:
tire size - O.D. - sidewall - indicated=actual - ratio change %
195/55-15 - 23.4" - 4.2" - 60=61.1 - 1.8% overdriven
185/60-15 - 23.7" - 4.4" - 60-61.9 - 3.0% overdriven
185/65-15 - 24.5" - 4.7" - 60=63.8 - 6.2% overdriven
195/65-15 - 25.0" - 5.0" - 60=65.1 - 8.0 % overdriven
185/70-15 - 25.2" - 5.1" - 60=65.7 - 8.8 % overdriven

hope that helps
 
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just remember the speedometer/odometer will be thrown off so you will need to account for that.
here are some sizes to consider that will fit the fiat rim and should not rub (provided you are not lowering the car)

stock:
185/55-15 - 23" overall, 4" tall sidewall, 60mph indicated = 60 mph actual, 0% overdriven

alternatives:
tire size - O.D. - sidewall - indicated=actual - ratio change %
195/55-15 - 23.4" - 4.2" - 60=61.1 - 1.8% overdriven
185/60-15 - 23.7" - 4.4" - 60-61.9 - 3.0% overdriven
185/65-15 - 24.5" - 4.7" - 60=63.8 - 6.2% overdriven
195/65-15 - 25.0" - 5.0" - 60=65.1 - 8.0 % overdriven
185/70-15 - 25.2" - 5.1" - 60=65.7 - 8.8 % overdriven

hope that helps
Thanks for the great info!

Do you know if the Studio can recalibrate the speedometer if I switch from the stock 16" Abarth wheels to my 17" wheels with the same size tires that come on the Abarth 17" wheels?
 

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Taller tires may not necessarily give you better MPG. The suspension is a system. Changing one part of it may not yield the results you are looking for, In other words, you might be setting yourself up for a trial and error situation which means spending time and money. New tires, mounting, balancing is all an effort. It might not be worth it.
 

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I believe if you don't change the exhaust and intake you will hurt your mileage with the bigger tires. If you do allow the little engine to breath with a good intake and exhaust system, your mileage may stay the same except give you a little better top end. That is what I found on my sport. I have not gained any MPG with all my mods but the power is very much improved and when I added a hood scoope to supply my short ram intake with fresh air I gained a very strong pull in forth gear that wasn't there before. So I agree with Michaelo about changing the tire size.
 

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You wont recoup money spent on tires. You'll spend $400most to save $20.
I think that's correct. Also consider how the car may look...may be truck-like, if that matters.
 

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Speaking of looks the stock setup from the rear already to me looks a bit odd cause the width is narrower than I care for, that said adding taller would only make it look worse I'd think but I suppose if you do not care about the looks and just care for the MPGs then whatever works for you would be ideal. Does seem you'll spend a pretty good amount to get a somewhat small return though.
 
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