Non-matching Tyres
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greymatter
Member
Re: Non-matching Tyres
It should not affect your performance. The tires are of the same manufacturer, same performance class, same price bracket. I'm guessing that you are replacing the fronts that have worn down faster than your rears. In that case, you are much, much better off than you were before the tire change.
It should not affect your performance. The tires are of the same manufacturer, same performance class, same price bracket. I'm guessing that you are replacing the fronts that have worn down faster than your rears. In that case, you are much, much better off than you were before the tire change.
Re: Non-matching Tyres
Not advisable.
The different performance between front and rear wheel will create the front or rear losing traction at different critical speed so the car become unbalance once the speed cross over the lower of the 2 critical speed. Example if front critical speed is 160 km/h and rear is 140 km/h then when accelerating out of bend and speed move over 140 km/h. The rear will lose traction and there will be a sudden imbalance of over- steer.
Mixing between left and right is more damaging.
Also lots of driver replace tire only 2 at a time either front or rear even if using same type of tire is also looking for unnecessary danger since the new and old tire will have different critical traction speed.
The solution is to practise good tire rotation habit so all 4 tires wear out at the same time and can replace all 4.
Not advisable.
The different performance between front and rear wheel will create the front or rear losing traction at different critical speed so the car become unbalance once the speed cross over the lower of the 2 critical speed. Example if front critical speed is 160 km/h and rear is 140 km/h then when accelerating out of bend and speed move over 140 km/h. The rear will lose traction and there will be a sudden imbalance of over- steer.
Mixing between left and right is more damaging.
Also lots of driver replace tire only 2 at a time either front or rear even if using same type of tire is also looking for unnecessary danger since the new and old tire will have different critical traction speed.
The solution is to practise good tire rotation habit so all 4 tires wear out at the same time and can replace all 4.
Seraphblade
Well-Known Member
Re: Non-matching Tyres
On the contrary, it actually matters.... Although the performance of CSC 5 and CSC 3 are pretty similiar, if you are talking about day to day driving, the difference in the performance will not surface... However, if you are taking it to the limit, there are things u need to take note of.
First of all, are the tyres both new? You should only mix and match tyres in dire situations, and if you do so, new tyres should go to the back, esp in RWD cars like the BMW.
Even if they are both new, having more grip @ the back is more impt (thus staggered setup always put the bigger ones @ the back. This is due 2 the rear driving the car, and to give the gear more grip)
During cornering @ high speed, there is always a tendency for most ppl to release the gas or worst still, step on the brake when they feel that the car is "approaching the limit". When you do so, there is a weight transfer to the front, and the rear loses traction, and u oversteer (i.e. drift - that is how some ppl initiate a drift, step on the brake to initiate weight transfer / nose dive, and then whack the gas for the rear to lose traction).... This is extremely dangerous for the uninitiated... I know this cause I spunout many times on Sepang using mismatch tyres, and some track gurus explained to me...
Even without the weight transfer, having lesser traction @ the back will also cause this situation to happen once the car is too fast and the rear loses traction first...
So in any case, if you want to use different tyres, put the old one in front, you will just understeer at worst, which is easily manageable... (At most buang the sidewall)
greymatter;930014 said:
On the contrary, it actually matters.... Although the performance of CSC 5 and CSC 3 are pretty similiar, if you are talking about day to day driving, the difference in the performance will not surface... However, if you are taking it to the limit, there are things u need to take note of.
First of all, are the tyres both new? You should only mix and match tyres in dire situations, and if you do so, new tyres should go to the back, esp in RWD cars like the BMW.
Even if they are both new, having more grip @ the back is more impt (thus staggered setup always put the bigger ones @ the back. This is due 2 the rear driving the car, and to give the gear more grip)
During cornering @ high speed, there is always a tendency for most ppl to release the gas or worst still, step on the brake when they feel that the car is "approaching the limit". When you do so, there is a weight transfer to the front, and the rear loses traction, and u oversteer (i.e. drift - that is how some ppl initiate a drift, step on the brake to initiate weight transfer / nose dive, and then whack the gas for the rear to lose traction).... This is extremely dangerous for the uninitiated... I know this cause I spunout many times on Sepang using mismatch tyres, and some track gurus explained to me...
Even without the weight transfer, having lesser traction @ the back will also cause this situation to happen once the car is too fast and the rear loses traction first...
So in any case, if you want to use different tyres, put the old one in front, you will just understeer at worst, which is easily manageable... (At most buang the sidewall)
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greymatter
Member
Re: Non-matching Tyres
Some BMW variants can come with staggered or non-staggered fitments for the same car with the same specs. If what you say is true, then BMW could be endangering it's customers. I don't think so. There are so many variables that determine whether the front or rear breaks traction first. You could run all 4 identical tires with identical production dates and identical pressures; and you could have perfect weight distribution, driver seated in the middle of the car; and you could have the perfect road that is absolutely level with a uniform friction co-efficient. But the moment you have any linear acceleration (and what car doesn't), the ball game changes.
What I was trying to impress on the OP is that running tires with sufficient tread depth, even if they are of different models, is much better than running identical tires that are worn down, especially the front pair.
IS250C;930020 said:
Some BMW variants can come with staggered or non-staggered fitments for the same car with the same specs. If what you say is true, then BMW could be endangering it's customers. I don't think so. There are so many variables that determine whether the front or rear breaks traction first. You could run all 4 identical tires with identical production dates and identical pressures; and you could have perfect weight distribution, driver seated in the middle of the car; and you could have the perfect road that is absolutely level with a uniform friction co-efficient. But the moment you have any linear acceleration (and what car doesn't), the ball game changes.
What I was trying to impress on the OP is that running tires with sufficient tread depth, even if they are of different models, is much better than running identical tires that are worn down, especially the front pair.
greymatter
Member
Re: Non-matching Tyres
The OP has put CSC5's in front. This suggests that his fronts have worn down faster than his rears. I am guessing that a) he does not track his car, b) he does not do opposite-lock power slides, and c) he does not do full throttle launches. So I'm guessing that he does a lot of city driving, drives in and out of carparks a lot, has a heavier brake foot than a throttle foot.
I'm guessing that it's not going to make a difference for his intended purpose. Of course, if his alignment is out of whack...
Seraphblade;930021 said:
The OP has put CSC5's in front. This suggests that his fronts have worn down faster than his rears. I am guessing that a) he does not track his car, b) he does not do opposite-lock power slides, and c) he does not do full throttle launches. So I'm guessing that he does a lot of city driving, drives in and out of carparks a lot, has a heavier brake foot than a throttle foot.
I'm guessing that it's not going to make a difference for his intended purpose. Of course, if his alignment is out of whack...
Seraphblade
Well-Known Member
Re: Non-matching Tyres
Oh. Cos if he is driving the F30, it comes with CSC5, so I thought that his rears went botak first...
greymatter;930035 said:The OP has put CSC5's in front. This suggests that his fronts have worn down faster than his rears. I am guessing that a) he does not track his car, b) he does not do opposite-lock power slides, and c) he does not do full throttle launches. So I'm guessing that he does a lot of city driving, drives in and out of carparks a lot, has a heavier brake foot than a throttle foot.
I'm guessing that it's not going to make a difference for his intended purpose. Of course, if his alignment is out of whack...
Oh. Cos if he is driving the F30, it comes with CSC5, so I thought that his rears went botak first...
ozipo
Well-Known Member
Re: Non-matching Tyres
just wondering four rubbers with different patterned threading,
exactly are there such major deep differences in performance?
I have seen Datsun Pickup with four different type of tyres with different
wearing out patterns and the driver was driving like jay Chou with an arm
resting on the wind-down door....no drifting
just wondering four rubbers with different patterned threading,
exactly are there such major deep differences in performance?
I have seen Datsun Pickup with four different type of tyres with different
wearing out patterns and the driver was driving like jay Chou with an arm
resting on the wind-down door....no drifting
Red_Bean_Bun
Well-Known Member
Re: Non-matching Tyres
And wet weather driving as well ....... Aqua planing can be obvious .....
And wet weather driving as well ....... Aqua planing can be obvious .....
Mockngbrd;930132 said:
