Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[johnnydog]

It's difficult to say what has caused that crack - it's not the usual buckle on an alloy that you would expect from a pothole / kerb impact. All I can think of if the wheel has had some form of impact on another part of the rim which in turn has caused the rim to flex somewhat in the process, and not being  strong enough to absorb the flexing, has caused the edge to crack at another place, rather than buckle near the point of impact? Can't think of any other cause...?

[Andy B]

It's difficult to say what has caused that crack - it's not the usual buckle on an alloy that you would expect from a pothole / kerb impact. All I can think of if the wheel has had some form of impact on another part of the rim which in turn has caused the rim to flex somewhat in the process, and not being  strong enough to absorb the flexing, has caused the edge to crack at another place, rather than buckle near the point of impact? Can't think of any other cause...?

Though it's probably hit a pothole or 2, there's no other obvious impact damage. 

[Field Marshal Dr. Opti]

I removed a wheel to clean off all the old goo from previous balance weights. When it was all nice & clean I found this ... 

?

Is this a common well known fault of the breed, or unusual?

[Andy B]

....
Is this a common well known fault of the breed, ...

Not that I know of 

[Doctor Gollum]

....
Is this a common well known fault of the breed, ...

Not that I know of 

If by breed, you mean large diameter alloys, then yes.

Had to replace two wheels on the second Insignificant due to similar damage.

[Field Marshal Dr. Opti]

....
Is this a common well known fault of the breed, ...

Not that I know of 

If by breed, you mean large diameter alloys, then yes.

Had to replace two wheels on the second Insignificant due to similar damage.

I believe Mr Beanz to be  the most wealthy man in Bury, so replacement should be financially painless.

[Andy B]

.....
I believe Mr Beanz to be  the most wealthy man in Bury,

I wish! 

so replacement should be financially painless.

A USED replacement is on its way 

[Sir Tigger KC]

Scuse me for being a bit fick, but what's 'straddling the pillows' ?       

That makes it sound pervy 

Basically negotiating those square speed humps with a wheel either side. Which ends up running the inner edge of the wheel over a smaller crown than the whole hump, but still higher than the road surface where the outer edge of the wheel is. Effectively this puts the full weight of the vehicle on the inner edge of wheel as you drive it over the front and rear edge of the speed hump. Doing this at a pace smacks the inner rim into what is usually a straight edge,  which significantly increases the loading on the wheel in a manner that it cannot support.

Ah I see. Thanks for the explanation. 

The places I tend to hang out, folk are more likely to straddle a sheep than a pillow. 

Isn't that right Rae? 

[BazaJT]

Some years ago a cracked rim[or more than one]was a common occurrence on BMWs.

[Lizzie Zoom]

I must have been lucky, but my front near side wheel has had two large direct ‘hits’, once with a large pothole, the other, my fault, when I collided with a speed reducing, sticking out in the road, kerb. Although I lost the low profile tyres in both cases, the alloy received no damage at all, which was confirmed by the specialist tyre shop I use.

Near miss obviously

[Doctor Gollum]

The 235/45/17 tyres on your Omega aren't exactly low profile, nor the wheels, although the early MV6 wheels were known as Toffee wheels for a reason. Later MV6 and Elite wheels are as strong as the 16" ones,  but weigh twice ss much as the original MV6 ones.

The 225/55/16s on the CD/CDX wheels fitted to plods were basically bombproof.

The wheels that suffer are those that are not only greater diameter, but also wider. To keep the weight down,  these types of wheels can be lacking in material thickness, which makes them prone to buckling, cracking and other stress related damage.

Anything much over 18"/7J is potentially susceptible, and the larger those two numbers,  the greater the liklihood.

[Lizzie Zoom]

The 235/45/17 tyres on your Omega aren't exactly low profile, nor the wheels, although the early MV6 wheels were known as Toffee wheels for a reason. Later MV6 and Elite wheels are as strong as the 16" ones,  but weigh twice ss much as the original MV6 ones.

The 225/55/16s on the CD/CDX wheels fitted to plods were basically bombproof.

The wheels that suffer are those that are not only greater diameter, but also wider. To keep the weight down,  these types of wheels can be lacking in material thickness, which makes them prone to buckling, cracking and other stress related damage.

Anything much over 18"/7J is potentially susceptible, and the larger those two numbers,  the greater the liklihood.

Thanks DG, very interesting