Light weight rotors, are they a myth

[geoffdunk]

Hi all,

I keep seeing 20" original 20" ET26 rotors advertised stating they are the later special edition version that were 45% lighter than the ones used prior to 2015, is there in truth in this. The ones I have seen are RS5 wheels with 275 section tyres on but they are the same wheels as the RS4 with the correct dimensions.

I know my way round these cars pretty well but never knew about this, unless its BS of course.

I am after a 2nd set of wheels and want to make sure I'm not paying over the odds.

Cheers all in advance

Regards

Geoff

[smudge]

I have nothing much of value to add, other than with the weight of the car being what it is, I would have thought that a 20" wheel weighing some 45% less would be potentially weak also. I've not seen or heard anything though....

[geoffdunk]

The theory is sound as reducing unsprung weight is always good, I just wasn't sure they existed, certainly not 45% reduction.

The wavey disks reduce unsprung weight by 4 kg.

[geoffdunk]

I have nothing much of value to add, other than with the weight of the car being what it is, I would have thought that a 20" wheel weighing some 45% less would be potentially weak also. I've not seen or heard anything though....

I'm gonna put a call into ex-colleges at Audi to find out.

[Covkiller]

This sounds like bullshit to me as not even forged alloys achieve a 40% weight saving over cast alloys

[Surrey Sam]

As above, I've got some BMW M-Performance forged alloys here and whilst lighter. They're not that significant a weight saving over the original spec items.

The 'edition' RS4 only had a different style of 20" rotor with the diamond cut or red outer lip - Order code PQV or PQ7. I think the lightest 20" wheels in the RS4 range were actually the V-Spokes?

[geoffdunk]

This sounds like bullshit to me as not even forged alloys achieve a 40% weight saving over cast alloys

Exactly what I thought, thought I'd better ask around 1st though.