Unusual Tyre Wear C5 X7
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Re: Unusual Tyre Wear C5 X7
My memory could well be playing tricks on me and it was about 50 years ago but I seem to recall being advised during my cycling proficiency test training to always apply the rear brakes first in the interest of stability. Perhaps Mr ESP is doing the same?
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Re: Unusual Tyre Wear C5 X7
Well, the (motor)bikes are a world of its own, you try braking with only the front brakes at 20 mph+ and see what happens ... ... on the bikes you should apply both brakes evenly and shift your center of gravity to the back if possible (definitely not towards the front, unless you're Lance Armstrong going at 50 mph down the road .. ) ... the average break bias should be roughly 65-35 front to rear (of course, some newer cars have the electrical possibility to actively redistribute the breaking power on all wheels), especially on the cars where the engine is front mounted (most of them) ... also, take into consideration the brake pads & disc size front & rear, and you'll figure out how the car actually brakes and why ... regarding the ESP, here's a great video of what it actually does ... " onclick="window.open(this.href);return false; ... unless you're always driving on the edge like in the examples, there is no way the (properly working) ESP itself would be to blame for the unexpected tyre ware (IMO at least) ...
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Re: Unusual Tyre Wear C5 X7
Indeed, plus I believe that linked brakes on motorcycles do this automatically.isisalar wrote:My memory could well be playing tricks on me and it was about 50 years ago but I seem to recall being advised during my cycling proficiency test training to always apply the rear brakes first in the interest of stability. Perhaps Mr ESP is doing the same?
As a bit of an update, since I fitted new rear disc's and pads the amount of brake dust being deposited on the rear wheels appears to have reduced to the point where it is no more or even slightly less that what is being deposited on the front wheels.
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Re: Unusual Tyre Wear C5 X7
Maybe not the ESP but the EBD or the initial set up by Citroen could be.vborovic wrote:Well, the (motor)bikes are a world of its own, you try braking with only the front brakes at 20 mph+ and see what happens ... ... on the bikes you should apply both brakes evenly and shift your center of gravity to the back if possible (definitely not towards the front, unless you're Lance Armstrong going at 50 mph down the road .. ) ... the average break bias should be roughly 65-35 front to rear (of course, some newer cars have the electrical possibility to actively redistribute the breaking power on all wheels), especially on the cars where the engine is front mounted (most of them) ... also, take into consideration the brake pads & disc size front & rear, and you'll figure out how the car actually brakes and why ... regarding the ESP, here's a great video of what it actually does ... " onclick="window.open(this.href);return false; ... unless you're always driving on the edge like in the examples, there is no way the (properly working) ESP itself would be to blame for the unexpected tyre ware (IMO at least) ...
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Re: Unusual Tyre Wear C5 X7
Would bad wheel alignment be a possible problem? If it is off by a small margin (vertical or lateral shift), it could eat away the tires faster than normal:
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Re: Unusual Tyre Wear C5 X7
Yes it would but my car has been on three different Hunter DSP 600's out of IIRC four attempts at finding anything out of alignment and they all with different operators say the alignment is correct.vborovic wrote:Would bad wheel alignment be a possible problem? If it is off by a small margin (vertical or lateral shift), it could eat away the tires faster than normal:
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Re: Unusual Tyre Wear C5 X7
FYI
Washed mine again today, checked the tires, more on the front than the back as before so no change to normal "pattern".
Done a few miles since the wheels were cleaned, more dust on front than the back (80-20), so no change there either.
Washed mine again today, checked the tires, more on the front than the back as before so no change to normal "pattern".
Done a few miles since the wheels were cleaned, more dust on front than the back (80-20), so no change there either.
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Re: Unusual Tyre Wear C5 X7
Maybe if you'd put the rear wheels on the front and vice-versa, then the dust would be 20-80? ... ...
Re: Unusual Tyre Wear C5 X7
How about asking a local MOT station to put it on their brake testing gear? Should show up any anomalies in braking force.
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Re: Unusual Tyre Wear C5 X7
The only way to get an accurate answer to the braking question would be to put the car on a 4 wheel brake roller (which I've never seen anywhere) as the question being presented is where the braking force is being applied under light braking which is all I ever use. MOT brake test rollers only do one axle at a time where their purpose is to test maximum brake efficiency which I've never had cause to use since I bought it.dnsey wrote:How about asking a local MOT station to put it on their brake testing gear? Should show up any anomalies in braking force.
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Re: Unusual Tyre Wear C5 X7
Jut thinking about it, the extra W&T on the rear must be due to some form of miss-alinement, even a modicum of additional braking should not cause that. The main W&T to any tire is turning and shear (cornering) forces, rotation and braking causes far far less.
It has to be an alinement problem ? twisting/moving struts under compression
It has to be an alinement problem ? twisting/moving struts under compression
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Re: Unusual Tyre Wear C5 X7
I remembered this topic during my Service Documentation excavations ... managed to dig up the tech data for the wheels geometry ... if someone knows what do do with all the figures, degrees etc, I could post it up for reference (I'll have to find the english language docs though, I have them in croatian) ... also, the reference height values for both wheels are available, (for the steel sprung suspension, but I believe I could dig up the hydro one as well)
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Re: Unusual Tyre Wear C5 X7
Always noticed more brake dust on the rears than the fronts on the X7. This is despite a having all the discs and pads replaced. But back to the tyre wear issue. I have always had the front tyres go way before the backs on the MK1, the facelift and the X7. Lucky to get 8k on a set of fronts in rural Wales. I've had Uniroyal Rainsport 2 on all 4 corners for the last 2 changes, but as I write this post, I'm sitting in the garage having 2 Michelin CrossClimate tyres fitted to the fronts. The write ups are good and although in the UK winter tyres are not required, with the weather changing and the Uniroyals on the Bars, am taking the plunge. Summer tyre with winter certification and the videos show good performance in the snow. I'll monitor mileage with these as can't be any worse than all the other brands I've had!
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Re: Unusual Tyre Wear C5 X7
I'll still stick to having a summer + winter combination of tyres (but one set of rims) ... I've read some comments on the CrossClimates, that they add to the fuel consumption (roughly 0,5 l/100 km) and that they're a bit louder that other tyres, but it has to have some drawbacks if it does the winter&summer job in a single product ...
Re: Unusual Tyre Wear C5 X7
Motorbikes 90% of the braking is on the front - touch the back with the weight transfer to the front the back will lock. Touch the back on the track and you are in real trouble, i have seen people being kicked off a track day because they did not know how to brake correctly and kept locking the back.vborovic wrote:Well, the (motor)bikes are a world of its own, you try braking with only the front brakes at 20 mph+ and see what happens ... ... on the bikes you should apply both brakes evenly and shift your center of gravity to the back if possible (definitely not towards the front, unless you're Lance Armstrong going at 50 mph down the road .. ) ... the average break bias should be roughly 65-35 front to rear (of course, some newer cars have the electrical possibility to actively redistribute the breaking power on all wheels), especially on the cars where the engine is front mounted (most of them) ... also, take into consideration the brake pads & disc size front & rear, and you'll figure out how the car actually brakes and why ... regarding the ESP, here's a great video of what it actually does ... " onclick="window.open(this.href);return false; ... unless you're always driving on the edge like in the examples, there is no way the (properly working) ESP itself would be to blame for the unexpected tyre ware (IMO at least) ...
The only exception would be Harleys and motorcross bikes. Keith Kode who taught Wane Rainey to race says dont even bother to use the bake brake on a bike.
I have also owned linked brake motorcycles and they are terrible a lot of motorcyclists want it disconnected.
As for your problem you do need to get the car to a decent alignment specialist like Steertrack