Best tire ratio

Discussion in 'Gen 3 Prius Fuel Economy' started by Jonny Morrow, Nov 18, 2016.

  1. Jonny Morrow

    Jonny Morrow Junior Member

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    Hey guys!

    My 2010 prius has aftermarket 16" rims up from the OEM 15". Looking to get into a new set of Michelin Energy Saver A/S. Fuel Economy is my primary concern, noise is my second concern. Should I go 65, 60 or 55 ratio. I believe OEM for the 2010 is 195/65-15. Should I go 55 since my rim is plus one?

    What are the major differences in these ratios and how does it affect the car? Thanks for the help!
     
  2. WilDavis

    WilDavis Senior Member

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    Welcome to PriusChat! Take care what you ask for! This link might help you http://www.tirerack.com/tires/tiretech/techpage.jsp?gclid=CI68vv6MstACFQ5YDQodaCoOWA&techid=46&s_kwcid=AL!3756!3!72454646413!b!!s!!+tire%20+sizes%20+explained&ef_id=UjW6WgAAAOsBPT1d:20161118103141:s

    :eek:

    Scroll down to Sidewall Aspect Ratio.

    hope this helps - Wil

    PS: My 2009 Gen II was shod with Michelin Energy Savers until the beginning of this summer. I'd put on a set of winter wheels (regular 15" steel rims shod with Blizzak WS80s for the winter) but at the beginning of last summer, the car needed new tyres (state inspection), and my local Town Fair Tire guy recommended Antares Ingens A1 (no, I'd not heard of them either) as being a great summer tyre, very quiet, efficient, and about ½ the price of a set of Michelins. Michelins are great tyres, but their tread tends to outlast their sidewalls. The sidewalls on my Michelins were developing fine cracks, and the tyres were starting to get very noisy! I found the Antares to be everything I'd hoped them to be, great in the wet, whisper quiet, and perhaps not quite as efficient as the Michelins, but with gas @ $2.20/gal who cares?
     
    #2 WilDavis, Nov 18, 2016
    Last edited: Nov 18, 2016
  3. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Your OEM tires had a diameter of 25 inches and rotated 833 times per mile. If you want the speedometer to be accurate, you want the same specs for the silly 16 inch size. 205/55R16 matches pretty close 24.9 inches and 836 revs per mile. Other sizes will have more speedo error.

    Since you won't have to be doing math to know if you are legal, these should be cheaper in the long run than sizes where the speedo lies.

    Or you COULD wisely go back to stock.
     
  4. Jonny Morrow

    Jonny Morrow Junior Member

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    Thanks for the feedback JimboPalmer. Yeah I bought the car used and it only came with these rims. I agree, not ideal. Other than speedo accuracy, what other advantages would you say there are on the stock 15" rims with the recommended tire? I could be persuaded to go back if comfort and economy improve.
     
  5. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Both Comfort and Economy will improve, the stock tire height is 65% if its width, there is more tire between you and the road. (if the wheel is one inch larger, the tire has to be 1 inch smaller) Since tire is lighter than wheel, a smaller wheel will also weigh less. Rotating mass is particularly bad for fuel mileage.
     
  6. Jonny Morrow

    Jonny Morrow Junior Member

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    Thanks for the feedback. Probably headed in that direction.
     
  7. Mendel Leisk

    Mendel Leisk Titanic Social Director

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    Just editorial Jimbo, should "speedometer" read "odometer"? The latter is what counts, and I fully agree sticking with stock OD is the way to go.
     
  8. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    I like not to get tickets, so I worry more about the speedometer. :)
     
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