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Old 01-22-2015, 02:53 AM   #1 (permalink)
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Tyres tyres tyres sizes!

Anobody got some info or results on different tyre setups. I know deacreasing the width of the tyre helps but what about increaseing the profile (Tallness of a tyre) i saw a new suzuki swift in traffic and noticed its tyres look rather large on the 14 inch rim. after some researching i found out it runs a setup of 165/80 r14. my stock setup is 175/65 r14

on this site willtheyfit. com i compared the 2.

the results show that i will gain 18.3mm (0.72inch) on the circumfrence. bigger wheel means less turning to be done to maintain same speed bringing revs down. how significant will my FE change? the width has also reduced so i know that wil help.

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Old 01-22-2015, 03:17 AM   #2 (permalink)
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Quote:
Originally Posted by Eddie25 View Post
Anobody got some info or results on different tyre setups. I know deacreasing the width of the tyre helps but what about increaseing the profile (Tallness of a tyre) i saw a new suzuki swift in traffic and noticed its tyres look rather large on the 14 inch rim. after some researching i found out it runs a setup of 165/80 r14. my stock setup is 175/65 r14

on this site willtheyfit. com i compared the 2.

the results show that i will gain 18.3mm (0.72inch) on the circumfrence. bigger wheel means less turning to be done to maintain same speed bringing revs down. how significant will my FE change? the width has also reduced so i know that wil help.
If your stock is 175/65R14 then step down to 165/65R14 and get Bridgestone potentza Re92's. They WILL give at least a 5% increase. They are 5% better than the next best tire out there (Michellin energy savers).

When I went from 175/65R14 on my insight to 165/65R14 potentza Re92's I gained 8mpg in my insight. From 55 to 63 on average, sometimes more. So I roughly gained 15%.
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Old 01-22-2015, 05:28 AM   #3 (permalink)
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Tire size isn't very important compared to the tire itself. I discuss this in more detail here:

Barry's Tire Tech

Short version: Differences in tire size are on the order of single digit percent, where differences between tires of the same size are double digit percent.

And bigger is better.
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Old 01-22-2015, 07:13 AM   #4 (permalink)
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Quote:
Originally Posted by Baltothewolf View Post
If your stock is 175/65R14 then step down to 165/65R14 and get Bridgestone potentza Re92's. They WILL give at least a 5% increase. They are 5% better than the next best tire out there (Michellin energy savers).

When I went from 175/65R14 on my insight to 165/65R14 potentza Re92's I gained 8mpg in my insight. From 55 to 63 on average, sometimes more. So I roughly gained 15%.
i found them but no1 that stocks them yet. i also found this tyre 175/65R14 BRIDGESTONE ECOPIA 200 82H . will read into it. i currently have falken tyres on bt the are poor quality. i want to change just the front for now.
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Old 01-22-2015, 01:54 PM   #5 (permalink)
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http://ecomodder.com/forum/showthrea...res-25208.html

14 pages of back and forth on the Bridgestone Ecopia used on the BMWi3. This is the tire I would like on my car some day. The diameter is very close to the stock 165R-15s.

Beware replacing only the fronts and ice. My car's at the body shop right now for that very reason.
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Old 01-22-2015, 02:56 PM   #6 (permalink)
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I still say taller is better only if you lower the suspension equal to the radius increase. Otherwise you increase aero drag. Also, taller sidewalls hurt handling, so taller tires need taller wheels. But it is worth it if you use the bigger wheels to fit bigger brakes. Always use the maximum wheel width for your chosen tire size, and always choose flat-face wheels that still have holes for brake cooling.
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Old 01-22-2015, 05:08 PM   #7 (permalink)
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Quote:
Also, taller sidewalls hurt handling, so taller tires need taller wheels.
A short sidewall improves turn-in. That's all happening between the bottom of the rim and the contact patch. How would increasing the rim diameter affect this?
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Old 01-22-2015, 10:58 PM   #8 (permalink)
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Quote:
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Also, taller sidewalls hurt handling
if this is true, explain formula 1 tires.
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Old 01-23-2015, 01:47 AM   #9 (permalink)
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Quote:
Originally Posted by freebeard View Post
http://ecomodder.com/forum/showthrea...res-25208.html

14 pages of back and forth on the Bridgestone Ecopia used on the BMWi3. This is the tire I would like on my car some day. The diameter is very close to the stock 165R-15s.

Beware replacing only the fronts and ice. My car's at the body shop right now for that very reason.
do you mean ice like snow ice? here its nice and warm we never get any snow
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Old 01-23-2015, 01:54 AM   #10 (permalink)
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i do not worry too much about handling. its straightish highway for 99% of the route. here the ecopia tyre comes with a pothole and sidewall damage warranty on on the roads here that would help alot. i have a second car that is the family car with the baby seat in so this car is purely going to be used for the commute to work and back.

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