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Old 07-17-2018, 12:17 AM   #217 (permalink)
mpg_numbers_guy
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Toby - '13 Toyota Prius C
Team Toyota
90 day: 63.99 mpg (US)

Daz - '15 Mazda 3 iTouring w/ Tech Package
Team Mazda
90 day: 38.2 mpg (US)
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I would have to buy new tires if I were to do it. However I have been far too busy to do much. Still in touch with both people who are selling HX rims.

I would need to buy new tires since the HX tires are significantly smaller than mine. I would need 185/80/14s or 185/75/14s.

185/80/14s would give me 2.6% taller gearing. 185/75/14s would give me 0.3% shorter gearing.

Comparison:
  • The 185/80/14s are...24lbs each...and a set costs $195. With HX rims it's 35.5lbs per wheel/tire. Savings of 2.5 lbs per wheel/tire, but also 2.6% taller gearing.
  • The 185/75/14s are...15.7lbs each...and a set costs $165. With HX rims it's 27.2 lbs per wheel/tire. Savings of 10.8 lbs per wheel/tire, but also 0.3% shoter gearing.

Current setup is 195/65/15s...20lbs each...with stock 18lb alloys...38 lbs per wheel/tire.

Which tire should I get (if I end up buying the rims)? Is a height ratio of 80 too much and unsafe? I'm leaning toward the 185/75/14s due to the cheaper price, more weight reduction, plus I'm only losing 1 mile every 400 or so, and RPMs are only raised 3 per 1000.
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2013 Toyota Prius C 2 (my car)


2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)

Last edited by mpg_numbers_guy; 07-17-2018 at 01:17 AM..
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