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jdh91

M sport spyder alloys

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Last month I had to replace 3 out 4 of my 19" spyder m-sport alloy wheels due to cracks.

Is it worth me downgrading to 18" to get a little extra tyre.

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Hi,

 

Any wheel can buckle, bend or crack. It all depends on the strength of the alloy wheel itself, the severity of knocks/bumps due to potholes and road surface quality, bumps and undulations etc. As a general rule, lower quality wheels have a higher risk of these issues and the higher up the quality scale you go, the more inherent strength of the wheel you get. 

 

So it's a guessing game really, you could indeed go to E60 OEM quality wheels at 18 inch on your car and the extra tyre sidewall (if not using runflats) will give some extra 'padding' as it were. You could stick with the 19's and change from runflats to normal tyres, this is due to runflats having very stiff sidewalls. 

 

Cheers, Dennis!

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Yup. Runflats do not help.

Bear in mind that the 18" M Sport wheels are not staggered

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Changed the run flats for normal tyres back last year after cracking the first and having it repaired.

Local tyre garage recommended bigger tyres but the 19s look so good.

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Are they original BMW 19" spiders? As these are an incredibly strong wheel, to crack one you must have hit some severe potholes?

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I find that hard to believe as originals are a forged wheel and reps are only a cast wheel, forged wheels are very tuff.

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Are the 172's definitely a forged wheel ? Iv always read conflicting reports would forged wheels not be lighter

Anyway its not uncommon for the 172 to crack on runflats similar to the 225m wheel

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Edited by gar525i

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Hi,

 

The OEM BMW Style 172's are a Cast method manufactured wheel and are made by one of the reputable specialists that supply many OEM's with wheels for their cars. Quality is high, everything is made using the latest equipment, tested and certified. Their design and inherent strength is also very good. 

 

Replica wheels which are usually unbranded aren't made to the same levels at all. They'd be structurally weaker due to being made from the most basic casting process as well as being made using the cheapest alloy whichever factory purchased that month in bulk. No replica wheels are made using the forging process, it's extremely expensive to purchase the raw materials and then to also machine it to make wheels from. 

 

jdh91 - so, which wheels have cracked ? the OEM originals ? or the replicas you now have? or over time, both sets? Please read my reply for you to evaluate which way you'd like to progress in response number 2 in this thread and the above in this reply. 

 

Cheers, Dennis!

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The genuine alloys have cracked

I now have 3 replica and one existing genuine.

Let's hope these last :)

Judging by the roads near me they won't :(

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Let's hope these last :)

Judging by the roads near me they won't :(

 

You'd be most likely correct on this assessment. I suggest you begin saving up for more wheels sooner or later. 

 

Cheers, Dennis!

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Correct me if I am wrong but all E60 wheels are cast including M5 wheels.

The E39 M5 wheels are also cast. I run forged M paras on mine

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19" spyders from factory do not have run flats.

The ones in pics to me look like reps, spokes look skinny and sharp edged and not dished enough?

Sent from my iPhone

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The genuine alloys have cracked

I now have 3 replica and one existing genuine.

Let's hope these last :)

Judging by the roads near me they won't :(

just read the whole thread and spotted this!! 19" spyders should never have been on run flats in first place?

And re running round on odd wheels on same axle, not a good move! get the extra rep for sake of few pennies.

Sent from my iPhone

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^ yep that's what I thought ...spiders were never meant to be fitted with runflats ...that's why a spacesaver spare wheel was automatically supplied from the factory if the spiders were specified from new.

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^ yep that's what I thought ...spiders were never meant to be fitted with runflats ...that's why a spacesaver spare wheel was automatically supplied from the factory if the spiders were specified from new.

Bancroft Library ? Did all the roofs on it last year, and did Queen Mary's in 1987.

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