Tyre/arch mystery...
Discussion
I have a mystery.
Since my ALPINA B10 V8's MoT in March I've been getting a very occasional noise; a momentary "krkkh" scrapey sort of noise from the rear, probably driver's side, coinciding with bottoming in dips...
The only thing I could think it might be was the little mudflaps just ahead of the axle line but they looked unscraped - most puzzling...
Then, the other day, following a spirited drive on undulating roads, I noticed the merest miasma of blue paint on the shoulder of the right rear tyre.
Aha! a reason for the noise.
At MoT time I had new rear tyres, Michelin PS2s, just like the old ones, and new front springs fitted so a KDS alignment check had been done - perhaps the rear geometry had been misadjusted?
No, nothing had been changed and all was in order following a recheck.
Had I mistakenly been supplied with Porsche spec "N" tyres?
No, not that either...
The mystery remains.
Any ideas?
Since my ALPINA B10 V8's MoT in March I've been getting a very occasional noise; a momentary "krkkh" scrapey sort of noise from the rear, probably driver's side, coinciding with bottoming in dips...
The only thing I could think it might be was the little mudflaps just ahead of the axle line but they looked unscraped - most puzzling...
Then, the other day, following a spirited drive on undulating roads, I noticed the merest miasma of blue paint on the shoulder of the right rear tyre.
Aha! a reason for the noise.
At MoT time I had new rear tyres, Michelin PS2s, just like the old ones, and new front springs fitted so a KDS alignment check had been done - perhaps the rear geometry had been misadjusted?
No, nothing had been changed and all was in order following a recheck.
Had I mistakenly been supplied with Porsche spec "N" tyres?
No, not that either...
The mystery remains.
Any ideas?
dunc_sx said:
The new tyres will be slightly taller (more tread) and also any camber adjustments will bring the tyre closer to or further away from the arch.
No change to rear geometry and it checks out in spec.The skim of paint is on the shoulder just off the tread area and there was no problem with the previous set of identical OEM spec tyres, even when new.
The rubbing seems to be where the arch transitions from rolled to unrolled, but it hasn't worn through the paint...
Have had exactly the same following a road trip across Spain and back, had a 4 wheel alignment approx 8 weeks back (on a Hunter machine) but the Spanish roads gave me that gut wrenching sound too many times to count, however I've put it down to springs getting a bit too soft and having the family and a boot full of luggage as well, nevertheless I've got to get it sorted....
Interestingly it was from the same wheel as yours although it was a little worse I'd say....
Interestingly it was from the same wheel as yours although it was a little worse I'd say....
Seesure said:
Have had exactly the same following a road trip across Spain and back, had a 4 wheel alignment approx 8 weeks back (on a Hunter machine) but the Spanish roads gave me that gut wrenching sound too many times to count, however I've put it down to springs getting a bit too soft and having the family and a boot full of luggage as well, nevertheless I've got to get it sorted....
Mine is more frequent when laden too.I'm thinking of getting the rolling continued round to at least 3 o'clock.
There really shouldn't be any rubbing anywhere in the suspension travel.
Seesure said:
Interestingly it was from the same wheel as yours although it was a little worse I'd say....
Ouch! That's much worse.What size tyres?
Yeah just roll it back a bit then. It's easy to catch areas like that when removing the spring perhaps, I'd have though it was due to a different shape tyre or slight difference in geometry when adjusted but wouldn't worry about it either way just get that bit tucked in and get bodywork there treated and touched up while you're at it 
Dunc.
Dunc.
Edited by dunc_sx on Wednesday 5th August 14:25
fluffnik said:
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Mine are 265/35 R18, ALPINA standard size...
M5 arches are rolled more tightly and have, I hear, different liners.
Mine's an M5 hence the wider tyre, and yes they are rolled and have different liners, so that's why I wondered if the springs weren't working the way they should. Am planning to get the suspension looked at then the arches sorted, even if it means a little more rolling....Mine are 265/35 R18, ALPINA standard size...
M5 arches are rolled more tightly and have, I hear, different liners.
Seesure said:
fluffnik said:
Mine are 265/35 R18, ALPINA standard size...
M5 arches are rolled more tightly and have, I hear, different liners.
Mine's an M5 hence the wider tyre, and yes they are rolled and have different liners, so that's why I wondered if the springs weren't working the way they should. Am planning to get the suspension looked at then the arches sorted, even if it means a little more rolling....M5 arches are rolled more tightly and have, I hear, different liners.
I was planning to get a few bodywork bits and pieces done anyway, I'll add it to the list...
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