Do 20 Inch Wheels Increase/decrease Performance?

[hulk xr6t]

Hi,

Do 20 inch wheels increase/decrease performance on our XR6T's?

Maybe the rolling diameter decrease the torque multiplication just like longer gearing and the weight lower our kw/tonn

but

Does a longer rolling diameter also put more load on the turbo, increasing its output?

Overall whats better. I note noone changes the 3.45 gears in the XR6Ts for shorter gears.

[senna_T]

you will get higher top speed, but the accelration will be greatly reduced.

The one thing that alot of people forget is that 20" wheels are very heavy, especially compared to standard 17" wheels

If you fit big chrome 20's you will notice the drop in performance almost immmediately, not to mention the relatively crap nature of affordable 20 inch tyres. So there goes your handling too.

Looks wise, they are great for our cars because they are big cars, performance wise they are no good really

Edited 11/03/08 01:25 AM by senna_T

[explicit]

Keep the weight down, maintain a rolling diametre to factory (25 profile with appropriate load rating) and you shouldnt suffer at all. But decent rubber costs money so do decent weight wheels. Your normal 1 piece tempe specials are generally regarded as anchors and come with appropriately cheap rubber.

[RHR]

It would have to be detremental to the handeling of the car. The way I look at it is that the wheels on our cars are engineered for our cars so I personally would not put anythiing greater that a 19 on my car (19 being the size of FPV wheels)

[INFLYT]

Speaking from experience over the year's, I've noticed a fair decrease in performance when we've added big Chrome wheel's to any of our car's.

[coupeboy351]

you will have less side movement in them but they will give a much harsher ride as tyre hight is so thin theirs no bump absorbion, also damage to them from running over crap on the road is more likely.

[Fry]

when I put the 17's on feels like it's quicker and trys to spin the tyres more with better tyres than with the 20's on and sh*t tyres, could all be in my head though

[RAP1D]

Changing to a larger rolling diameter is the same effect as changing to a lower dif ratio... the car will rev slower to get to a given speed, though with the power most of us have it really makes bugger all difference.

20s on a 200sx, for example, would make a slower take off

[xxr64t]

Speaking from experience over the year's, I've noticed a fair decrease in performance when we've added big Chrome wheel's to any of our car's.

is that the 20" or the 22" u speaking from experience!!!

[ratter]

If tyre tyre sizing is done correctly, the rolling diameter should remain the same as a smaller tyre so there would be no affect on gearing, but the added weight of the bigger wheels will affect how quick the motor will rev up.

Tyre brand will affect grip even if the motor is reving slower (due to the extra weight) so you will still possibly get wheel spin even with the lower performance with cheap tyres.