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428 Frua Forum / YouTube clip Ac 428 tyres
« on: December 11, 2012, 11:10:20 »
Hi
Yes it is true that tyre technology has moved on, but it movede on with the technology of cars of the day. yes a wider tyre will give you greater road holding (provided you have the rims to suit) in stopping but i would suggest hat your problems are not locking up the tyres in straight line braking. In the corners it is possible to over tyre a car. Also wider tyres make a car track where by it picks up the uneveness of the road.
Modern cars that are suited to more modern wider tyres have very different steering geometry to cars of your period. they have greater caster to overcome the tracking caused by wider tyres and then they have much cleverer poer steering to overcome the issues that this extra caster gives.
wider tyres make the steering heavier, which in turn wears the steering components.
I don't dissagree that fitting Michelins XWX tyres would possibly have been a period upgrade which will not effect the handling too much but then you loose diameter.
The reasons for recognising the Pirelli Cinturato are:
aesthetically they are perfect. This was the genuine period up grade to the Avon, as the Cinturato was a sports car tyre. the diameter is correct so it will keep your wheel arches full, gearing and speedo will be correct.
Also with the Cinturato you have a high quality tyre that will give you better grip than was available in period because you have better modern rubber compounds, without effecting the handling that fitting different sized tyres will do.
there is a difference between handling and road holding. fatter tyres will give you greater road holding (though may lead to aguaplaining). however the correct size tyres will make you car handle at it's best. in that the steering will feel the way it should, tracking will be kept to a minimum and the car will handle in a progressive manor. in that if yuou do push it round a corner it will drift instead of braking away violently in the way over tyres cars do.
I think 215/70VR15 and 225/70VR15 tyres will probably be fine, though the car will not have as comfortable ride with less side wall. but without doubt the Michelin XWX is by far the best.
I would respectfully suggest that 245/60Vr15 would be far too big for road use. what happens on the track is another story
Yes it is true that tyre technology has moved on, but it movede on with the technology of cars of the day. yes a wider tyre will give you greater road holding (provided you have the rims to suit) in stopping but i would suggest hat your problems are not locking up the tyres in straight line braking. In the corners it is possible to over tyre a car. Also wider tyres make a car track where by it picks up the uneveness of the road.
Modern cars that are suited to more modern wider tyres have very different steering geometry to cars of your period. they have greater caster to overcome the tracking caused by wider tyres and then they have much cleverer poer steering to overcome the issues that this extra caster gives.
wider tyres make the steering heavier, which in turn wears the steering components.
I don't dissagree that fitting Michelins XWX tyres would possibly have been a period upgrade which will not effect the handling too much but then you loose diameter.
The reasons for recognising the Pirelli Cinturato are:
aesthetically they are perfect. This was the genuine period up grade to the Avon, as the Cinturato was a sports car tyre. the diameter is correct so it will keep your wheel arches full, gearing and speedo will be correct.
Also with the Cinturato you have a high quality tyre that will give you better grip than was available in period because you have better modern rubber compounds, without effecting the handling that fitting different sized tyres will do.
there is a difference between handling and road holding. fatter tyres will give you greater road holding (though may lead to aguaplaining). however the correct size tyres will make you car handle at it's best. in that the steering will feel the way it should, tracking will be kept to a minimum and the car will handle in a progressive manor. in that if yuou do push it round a corner it will drift instead of braking away violently in the way over tyres cars do.
I think 215/70VR15 and 225/70VR15 tyres will probably be fine, though the car will not have as comfortable ride with less side wall. but without doubt the Michelin XWX is by far the best.
I would respectfully suggest that 245/60Vr15 would be far too big for road use. what happens on the track is another story