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The mkiv Supra Owners Club

Wider track.........


SkyJawa

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In warm weather yes, coz tyres will get too operating tempertures, so will grip well.

 

In wet will be less pressure on tyre area as it will be bigger contact area,so little water yes, but more water probably not unless has good tread pattern on it as has too move more water out of the way

 

Of course depends on amount of water, make of tyre, tread and loads of other factors!

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K, these are stock tyre sizes though, so no worse in size of contact area between rubber and ground to a normal supe?

 

Basically, I've stock size aftermarket wheels fitted. The front is a 32mm offset and the rear is 37mm. Now, what this has basically done (without the use of spacers) is to move the wheel further outwards to be more flush with the arch both front and back.

And I wanted to know if this should give me a bit better handling/grip or a bit worse.......

 

I've got RLTC, but sometimes I still think it should have more cornering grip before the TC has to cut in. I'm having my aligment done on Tues as I reckon its probably that which is well off, but was interested to see what effects a wider track would give too!

 

:)

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I'm no expert but from a purely common sense view it should reduce the forces trying to lift the outside wheel in a corner or something? But as with all suspension things, unless the geometry is set up to take advantage of it any radical changes will probably make things worse rather than better :D The main thing is keeping the contact area of the tyre parallel with the road surface in turns - 90% of the time lowering, spacers etc totally screw this up.

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Originally posted by John Packham

Don't mess about with wheel offsets etc just for cosmetic reasons, you'll wreck the handling, your tyres and everything else - Just don't do it!

 

Agreed absolutely! Whilst one can get away with mild offset cganges on the rear, without too dire a consequence, 8uggering around at the front end can cause serious horrible handling problems. Unless you REALLY understand what you are doing, and not many people do, to be honest, leave wheel offsets absolutely stock. Out of every 20 aftermarket wheel "jobs" I see maybe 4 are ok 'ish, and 1 is fine... The rest vary from bad to bloody dangerous.

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and re Neils' offsets, if you had a 45mm offset front wheel that was 9" wide (a common choice and near to standard offset) it would pretty much fill the arch the same as his 32mm and 8" rim, but would have the extra inch on the inside.

ie the distance from outer tyre edges (track?) is the same for both but the inner tyre edges distances (track?) would be different.

This makes a difference? or would the 45mm 9" be just as bad as 32mm and 8"?

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Originally posted by HISUPE

What about the figs/offsets I posted Chris? :(

 

50mm is stock offset. You should add equal width to the rim either side of its mounting face. But then you open a totally different can of worms, in so far as the bushing hysterisis of the stock car is calculated to control stock rim and tyre loadings.

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Originally posted by Chris Wilson

50mm is stock offset. You should add equal width to the rim either side of its mounting face. But then you open a totally different can of worms, in so far as the bushing hysterisis of the stock car is calculated to control stock rim and tyre loadings.

 

Cheers for the answer Chris, so in lamens terms its a bit pants? ;)

 

At least they clear the UK Spec callipers! :D

 

Guess I need to put some 18s on the shopping list then :( (bugger, as the Do-Luck ones are the only ones I'd put on - 2.5k feck!)

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Originally posted by Chris Wilson

Keep to 17's, and as light a rim and tyre as poss, the aerotops are not forgiving of massive unsprung weight, due to their lack if rigidity. The ones I have driven with big heavy rims on have shown up the structures inherent weakness rather badly.

 

Ok - cheers for the advice Chris :)

 

(I guess a forged 18 that carries the same weight as a 17 might be ok? Saying that though, I think I'd rather keep to much cheaper tyres in 17 variety!!!!) Just wondered how all these things weighed up (excuse the pun!) really!

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