Should I buy new wheels as well?

[kimona]

I always ran 205/50/16's on lightweight wheels on stock suspension on both my Yaris. I think it was the ideal set-up for great handling and appearance. Don't run an aggressive tread if you want good straight-line tracking at high speeds with this little car. Look for a continuous centre rib tread design.

[Compeer]

Originally Posted by kimona

I always ran 205/50/16's on lightweight wheels on stock suspension on both my Yaris. I think it was the ideal set-up for great handling and appearance. Don't run an aggressive tread if you want good straight-line tracking at high speeds with this little car. Look for a continuous centre rib tread design.

15" tires are quite a lot cheaper and lighter than 16" tho and give you little bit lower gear ratio. Tire prices and the fact that every tire shop stocks the 15's and not the 16's sells it for me. I used to run 16's on my old Lantis type R and the 16's were more expensive then the 17's in same tire.

Those wheels do look fire tho.

[sh0rtlife]

Originally Posted by Compeer

15" tires are quite a lot cheaper and lighter than 16" tho and give you little bit lower gear ratio. Tire prices and the fact that every tire shop stocks the 15's and not the 16's sells it for me. I used to run 16's on my old Lantis type R and the 16's were more expensive then the 17's in same tire.

Those wheels do look fire tho.

wrong...also weirdly enough...assuming you have various wheels you can often go up a wheel size and save a few bucks on rubber just because its a more popular size so its cheeper.....its one of the reasons im on 195s and not 205s the 205s jump the price 50$ a tire, unless i went to a 15 and then they would be 10$ cheeper a tire in a 205...the 205/50/15 is VERY common around the world thus making it cheeper..where the 196/60/14 is also common its just becomeing "less" common in "cheep" tires..when you get into performance based rubber, they are both very similaryly popular due to vintage cars


13, 14, 15, 16, 17..makes no differance on "gear ratio" and neither does 175, 185, 195, 205 etc

its all about the middle number IE 195/"60"/14..60% of the width"195" is the total height of the tire..thats why the middle number is called the aspect ratio
195/60/14=23.2
175/70/14=23.6
225/45/15=23......way wide but still the same ratio
195/55/15=23.4
295/35/15.....10 inches wide but still the right height for the ratio LOL
205/45/16=23.3
196/40/17=23.1


i could go on and on...
https://tiresize.com/calculator/

[Compeer]

Originally Posted by sh0rtlife

wrong...also weirdly enough...assuming you have various wheels you can often go up a wheel size and save a few bucks on rubber just because its a more popular size so its cheeper.....its one of the reasons im on 195s and not 205s the 205s jump the price 50$ a tire, unless i went to a 15 and then they would be 10$ cheeper a tire in a 205...the 205/50/15 is VERY common around the world thus making it cheeper..where the 196/60/14 is also common its just becomeing "less" common in "cheep" tires..when you get into performance based rubber, they are both very similaryly popular due to vintage cars


13, 14, 15, 16, 17..makes no differance on "gear ratio" and neither does 175, 185, 195, 205 etc

its all about the middle number IE 195/"60"/14..60% of the width"195" is the total height of the tire..thats why the middle number is called the aspect ratio
195/60/14=23.2
175/70/14=23.6
225/45/15=23......way wide but still the same ratio
195/55/15=23.4
295/35/15.....10 inches wide but still the right height for the ratio LOL
205/45/16=23.3
196/40/17=23.1


i could go on and on...
https://tiresize.com/calculator/

Whats wrong? 16's cost more than 15's and 17's.

I never said the width changes the gear ratio. My cars speedo sensor was tuned for 17" factory allows and with my current 15's the speedo is reading just under the correct speed which means I have lowered the final drive ratio of the gearbox. At 100kph on the speedo the roadside speed display signs show me at 94-96kph.

17" made the car feel even more gutless down low and a little more floaty feeling.

https://www.onallcylinders.com/2015/...l-drive-ratio/

[Neinris]

Personally I use this calculator instead:
https://www.wheel-size.com/calc/

Not only does it show the tire size, it also shows necessary offset.
What I didn't see mentioned are the supposed stock wheel/tire sizes of 175/65/R14 = 23 and 185/60R15 = 23.7

I discovered that there are two different speed sensor gears, mine has the one for 175/65/14, so my 185/60R15 tires makes my car go faster than what's indicated on the gauge cluster.
Use the calculator provided to get to the closest stock tire size. If you want to get better gas mileage, get a bigger diameter wheel/tire combo. For acceleration, smaller diameter.

[Compeer]

Originally Posted by Neinris

Personally I use this calculator instead:
https://www.wheel-size.com/calc/

Not only does it show the tire size, it also shows necessary offset.
What I didn't see mentioned are the supposed stock wheel/tire sizes of 175/65/R14 = 23 and 185/60R15 = 23.7

I discovered that there are two different speed sensor gears, mine has the one for 175/65/14, so my 185/60R15 tires makes my car go faster than what's indicated on the gauge cluster.
Use the calculator provided to get to the closest stock tire size. If you want to get better gas mileage, get a bigger diameter wheel/tire combo. For acceleration, smaller diameter.

If i remember correctly the car had its ECU changed to suit the wheels at factory. With the right scan tool i was lead to believe you can change the speedo to suit the new wheel size. Could be wrong with the yaris tho but i know other cars you can do this.

[Neinris]

Originally Posted by Compeer

If i remember correctly the car had its ECU changed to suit the wheels at factory. With the right scan tool i was lead to believe you can change the speedo to suit the new wheel size. Could be wrong with the yaris tho but i know other cars you can do this.

Actually, it’s not my ECU/ECM, because I have a smart ODB gauge plugged in, which I can adjust the speed it displays, but I have it set to 100% and the speed it displays is accurate when compared to my GPS and the speed RADAR that I pass by on the way to work.

[Compeer]

Originally Posted by Neinris

Actually, it’s not my ECU/ECM, because I have a smart ODB gauge plugged in, which I can adjust the speed it displays, but I have it set to 100% and the speed it displays is accurate when compared to my GPS and the speed RADAR that I pass by on the way to work.

My obd2 display shows same as my speedo is reading, I have the JDM RS vitz dash installed that did not come with the car and I changed that second day I owned it so this could also be why mines a bit off.