brake rotors

[mbaker76]

On a rear hub/rotor, how does everyone bolt the rotor to the hub. What I mean is if you look at the rotor there is one side of the mounting tab that is flush with the rotor surface then the other side is roughly centered in the rotors width. Do you mount it to the hub on the flush side or turn it around and bolt the center of the rotor to the hub. I have seen and ran this both ways, just wondering what everyones opinions are.

maybe it doesnt matter, just user option?

[billetbirdcage]

It should go on the flush side as the other side isn't machined so the rotor runs true.

[mbaker76]

So the tabs that are machined front and back arent necessarily true on both sides? I can see where the flush side would be true to the rotor face because it is done at one time. I assumed the other side of the tab was true as well but could be off a little i guess.

Will keeping the rotor inboard as much as possible help with cooling, or would it be minimal, considereing its only 1/2" and with 3" off wheels the rotor is still inside the wheel somewhat. Now with 2" off wheels it might be different, but maybe cooling isnt that big of a deal in these cars.

I had one guy tell me he always mounts them outboard for more clearance, but he also said once in awhile he has to put the whole hub/rotor assembly in the lathe to true it up, he said he assumed it was from the rotor flange on the hub being bent and he would have to do it no matter what way he mounted it.

[billetbirdcage]

If they are machined on both sides they should be able to mount either way. A lot of the 1.25 LM rotors aren't machined on both sides, maybe all the .810 mod ones are. My lack of experience with mods maybe showing as I haven't messed with .810 rotors.

My above post was assumiing that they weren't machined on both sides.

[mbaker76]

do you think it would hurt cooling by mounting them that way. What i mean is the rotor itself would be furthur inside the wheel, but only by about 3/8-1/2" but also the mounting ring would be pretty well centered in the rotor and possibly block airflow through the rotor? Maybe not maybe it would still pull air through fine, and maybe brake cooling isnt that big of a deal on mods?

[billetbirdcage]

My guess! I don't think there would be that much difference in cooling but the most inboard would be better by common sense.

Unless you have a reason or need to mount more outboard, I'd mount them most inboard. This way there is more clearance between the caliper and the wheel in case you later on need to use a increased offset wheel sometime.

[mbaker76]

Only reason for me thinking about mounting them outboard is for more clearance across the rearend. But even the way it is now i cant move the birdcages any furthur out unless we move the mounts on the frame or mount to the outside of the 4 link brackets instead of the center (double shear bracket). The only thing would be if we decide to move teh rearend a little more left I might run out of room on the RR bewteen the brake bracket and birdcage retainer. But i dont see that happeneing. LR I dont see being a problem at all at this point.

Only problem we ever had on LR was getting too much axle rotation and having the caliper bracket clocked backwards too far, when the axle rotated and the car was on the bars, the backside of the birdcage woudl get into the caliper. But turning the bracket forward a little and taming down rearend rotation pretty much cured that problem.