are all rotors the same diameter?

[StevieJ2]

2011 135, has the larger caliper (pic below). don't know anything about these cars - seen there are different sized rotors listed on various websites and not sure which size to grab. Will be fine with oem or oem similar & just using upgraded pads.

Guy I bought it from thought it would be a good idea to replace the pads and never the rotors apparently, because it had new pads.

[MightyMouseTech]

There is only one size of rotor on the 135i. You do have the option in the aftermarket to get either a solid steel rotor (cheaper, heavier), or the version with the aluminium hat like the factory rotor (more expensive, lighter).

That rotor actually looks aftermarket, I don't see the rivets for the aluminium hat.

[StevieJ2]

Originally Posted by MightyMouseTech

There is only one size of rotor on the 135i. You do have the option in the aftermarket to get either a solid steel rotor (cheaper, heavier), or the version with the aluminium hat like the factory rotor (more expensive, lighter).

That rotor actually looks aftermarket, I don't see the rivets for the aluminium hat.

I'm pretty sure whatever brand it is, it was the cheapest one he could find. Guy was a moron, he even installed a $39 viper alarm system on the car on top of the factory alarm that works perfectly fine.... which was a complete pain in the ass to remove that cobbled up mess behind the dash.

Thanks for the info - will just be doing steel ones. I put a set of $2500 lightweight rotors on the tesla last year and it did absolutely nothing for handling or braking over the oem rotors with upgraded pads.

[MightyMouseTech]

Originally Posted by StevieJ2

I'm pretty sure whatever brand it is, it was the cheapest one he could find. Guy was a moron, he even installed a $39 viper alarm system on the car on top of the factory alarm that works perfectly fine.... which was a complete pain in the ass to remove that cobbled up mess behind the dash.

Thanks for the info - will just be doing steel ones. I put a set of $2500 lightweight rotors on the tesla last year and it did absolutely nothing for handling or braking over the oem rotors with upgraded pads.

The aluminum hat version are only $50-$75 more.

[ShocknAwe]

Originally Posted by StevieJ2

I'm pretty sure whatever brand it is, it was the cheapest one he could find. Guy was a moron, he even installed a $39 viper alarm system on the car on top of the factory alarm that works perfectly fine.... which was a complete pain in the ass to remove that cobbled up mess behind the dash.

Thanks for the info - will just be doing steel ones. I put a set of $2500 lightweight rotors on the tesla last year and it did absolutely nothing for handling or braking over the oem rotors with upgraded pads.

Can't imagine it would help much on a car that heavy.

Stick with oem 2pc rotors, theyre not expensive and last a long time. Unless budget is a big concern in which case do what your needs dictate of course.

[Thunderguts]

Originally Posted by MightyMouseTech

The aluminum hat version are only $50-$75 more.

...AND they don't rust! Given how much water seems to get trapped between the wheel/rotor/hub, this is a huge plus. The hubs still rust like crazy, but at least they won't bond to the rotor. Forget performance, that alone is worth the cost.

[StevieJ2]

Originally Posted by Thunderguts

...AND they don't rust! Given how much water seems to get trapped between the wheel/rotor/hub, this is a huge plus. The hubs still rust like crazy, but at least they won't bond to the rotor. Forget performance, that alone is worth the cost.

Not that i'm getting the cheap ones, but rust is zero concern here in the desert.