[x328x]

Hi everyone

So like most of you I have modified my car quite a bit and in doing so have read a lot of information in regards to performance and handling

I see a lot of discussion about the importance of light rims and lighter tyres. People speak of unsprung weight

But no one talks about the added weight of going bigger breaks

Now I have the standard (non blue) m sport brakes on my car. 330mm rotors up front, 300mm (i think) on the rear. When i think about M Performance breaks, which have huge rotors (370mm and 345mm) and calipers which equates to a lot of steel. Surely this effects handling and performance like heavier rims would...right???

[enjoythemusic]

Well, the larger brakes are generally more rotating mass so yes it is undesirable. Unless you are doing **very heavy tracking/enduro**, the 'standard' M brakes should be fine even for 'normal' track use with Motul (or the like) brake fluid. What you could do is use M brakes and find someone who makes lightweight hat/floating rotors. That's what i did with the guys at Girodisc for the heavily tracked Ferrari.

http://www.girodisc.com/BMW_c_10.html

[F32Fleet]

The rotors with the M-sport brake pkg (blue) are the heaviest. M-Sport Line and M-Performance rotors are lighter and weigh about the same.

[x328x]

M performance weigh about the same. really?

Does anyone have official weights

I am not really two fussed but i just thought it was strange no one talks about it when they make a big deal on wheels

[liveevil]

The link in the first post leads to an excel with the weight of the rotors. The bigger m performance rotors are not significantly heavier, because they are 2-piece rotors. For the calipers, I didn't has the chance to weigh them but the m performance calipers felt lighter than the sliding one pot.

http://f30.bimmerpost.com/forums/sho...d.php?t=858607