!9" Rears And 18" Fronts

[jordak]

I've often thought that whilst 18" rims suit the "T" up front they don't quite do the job on the rear.

Apart from the obvious inability to rotate the rims whats the pros and cons and how does everyone think it would look. Better still anyone done it?

[spoonage]

1st thing is that it's illegal in Australia unfortunately. Apart from that, *shrug* it's up to you

[xxr64t]

illegal who cares. Whats legal theses days?? id go 19" front and 20" back dats me being a wog and a ricer in me.

[iTec]

illegal in australia?

the two front wheels must be of the same size and so must the two rear but the front and rear dont have to be. 20 rear 19 fronts would look much better.

one side effect *may* be that you will pitch the nose down alittle if you go for a same profile tyre (would look silly with a higher profile front) meaning the front will scrape and possibly carry more weight then the rear

[F6_Tornado]

ABS could be a problem!

The speed sensors detects the rotating speed of each wheel and with different rolling circumference I think the ABS might just get a tad confuse and play havoc with the brakes and you may well end up with a pulsating pedal under normal braking??

Look good though and you may be able to get more rubber on the bitumen on the rear as well.

[Ford_Power]

ABS could be a problem!

The speed sensors detects the rotating speed of each wheel and with different rolling circumference I think the ABS might just get a tad confuse and play havoc with the brakes and you may well end up with a pulsating pedal under normal braking??

Look good though and you may be able to get more rubber on the bitumen on the rear as well.

<{POST_SNAPBACK}>

Exactly - the ABS unit would see that the wheel speeds never match and the ABS system will shut down whilst logging a fault.

[jordak]

ABS could be a problem!

The speed sensors detects the rotating speed of each wheel and with different rolling circumference I think the ABS might just get a tad confuse and play havoc with the brakes and you may well end up with a pulsating pedal under normal braking??

Look good though and you may be able to get more rubber on the bitumen on the rear as well.

<{POST_SNAPBACK}>

Exactly - the ABS unit would see that the wheel speeds never match and the ABS system will shut down whilst logging a fault.

<{POST_SNAPBACK}>

I was working on the premis that the rolling circumference would be the same given that the 19' rears would have lower profile tyres I.e 265/35/19 vs 235/40/18 up front for example.

[F6_Tornado]

ABS could be a problem!

The speed sensors detects the rotating speed of each wheel and with different rolling circumference I think the ABS might just get a tad confuse and play havoc with the brakes and you may well end up with a pulsating pedal under normal braking??

Look good though and you may be able to get more rubber on the bitumen on the rear as well.

<{POST_SNAPBACK}>

Exactly - the ABS unit would see that the wheel speeds never match and the ABS system will shut down whilst logging a fault.

<{POST_SNAPBACK}>

I was working on the premis that the rolling circumference would be the same given that the 19' rears would have lower profile tyres I.e 265/35/19 vs 235/40/18 up front for example.

<{POST_SNAPBACK}>

Then it should be fine.

Some people go for bigger profiles to fill out the guards and in that sense it could or would be a problem but if your keeping them the same it will be sweet.

[IH8TOADS]

some cars come standard with different size front and back so I cant see how it would be illegal. It may be illegal to do it to a car that came standard with same size all round?? I personally wouldnt recommend it, however I do think it would look OK though, providing the tyre profiles and width are well considered.

[EVLKNEVL]

ABS does not rely on wheel speeds being equal front to rear- or left to right for that matter. it detects wheel lock-up and modulates pad pressure accordingly. Do you think that when you plant it at the lights and smoke the rear tyres, the ABS automatically shuts down and logs a fault code? Of course it doesn't. During a corner, all four wheels are spinning at different speeds to each other, and this does not affect the ABS at all.

As far as legality is concerned, an engineer's certificate may be required, but I can not see this being a hassle to aquire. Street Machine's VU ute ran 18" front wheels and 24" rear, and is fully street legal and registered.