Mazda Rotary Club

General => General Technical => Wheels & Tyres, Suspension & Brakes => Topic started by: Jimi_Hendrix on December 06, 2008, 06:42:54 PM

Title: If i put 18s on my car will it REALLY kill the handling?
Post by: Jimi_Hendrix on December 06, 2008, 06:42:54 PM
First off. When i had the CRX i was ALWAYS told anything bigger that 16 will kill the handling. But that was a little tiny car and it weighed less than a ton!
 
I KNOW it will negativley effect the 7\'s handling. The wheels i want to put on are 18 inch and weigh roughly 20 lbs each (without tyres!). I might not even bother its just that they look SOOOOOOOOOOOO good! Lol!
 
So if it was a road going racing car i was aiming for (which im not! Tried that with the CRX! HATED it! Lol!) i wouldnt even consider it. But with the 7 i\'m just trying to build a really nice fast road car, that can hold its own in the twisty bits.
 
So if i go from 17\'s weighing roughly 20lbs WITH tyres to these 18s is it suddely going to flop around the road like a whale?
 
Might sound like a stupid question, but humour me?:Giggle
 
Thanks guys!
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: gsb876 on December 06, 2008, 07:02:24 PM
nope, i\'ve had a fd with 17\'s/18\'s & 19\'s and all were ok tbh.
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: shaunwil on December 06, 2008, 07:28:21 PM
Handy link :

http://www.wheelweights.net/

The lighter you go the better off you are. I\'ve only ever had 17\'s on the FD but I used to have 19\'s on an FTO without any real problems.

Shaun
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: SiH on December 06, 2008, 08:26:26 PM
What wheels are they?

20lb is pretty darn heavy for a rim :( Wheel weight makes a HUGE difference to how the car drives as it\'s rotational mass so effects braking, suspension compliance, and steering.

I went from stock wheels on my previous car to lightweight forged ones with a slightly lower offset and a little wider, but stuck with exactly the same tyres, and the car was totally different - so much more responsive. I wish i\'d kept them instead of changing again :(
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: batman on December 07, 2008, 02:21:28 PM
i got 19 s and there fine
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: lockwood77 on December 07, 2008, 03:09:12 PM
Mine\'s on 18s and handles superbly (mainly a track car) - you\'ve just gotta get the geometry setup right, regardless of what wheels you\'re running.
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: jetpilot on December 08, 2008, 09:52:17 AM
Personally wouldnt go for bigger than 18\'s. have driven RX\'s with 16, 17, 18 and 19\'s and the 19\'s felt somewhat vague although they had high quality rubber.
Title: If i put 18s on my car will it REALLY kill the handling?
Post by: probedb on December 10, 2008, 01:40:33 PM
I have lightweight (Kei Racing D1) 18s and they\'re fine....as light as the stock wheels if not lighter I think (never weighed them) though obviously the rotational mass is moved further out which is worse.