Quote:
Originally Posted by hardparker
To answer question 1, calipers from G30 and G11 and similar will work. There are 348x36 calipers and 374x36 calipers, marked on the back. The 348x36 are often unpainted, but sometimes blue. The 374x36 are typically blue, but there were some black and silver ones on the G11.
Question 2: the rotor hub for the G30/G11 Brembo 4-piston calipers is smaller due to the smaller 112mm bolt pattern. On the face of it, there are F01 and F10 rotors with seemingly identical 348x36 and 374x36 sizes, but they're for 120mm wheel bolt pattern and have a larger diameter rotor hat, which the pad from the G30 calipers hits, so won't mount. Check DARKN1GHT's thread in the F10 forum to see what I mean:
Brake upgrades from other BMW models on F10. The reason why the E60 M5 rotor works is due to having the smaller hat diameter than the typical F01/F10 rotor hat diameter. Also, the 11mm increased offset eliminates the need for any lateral spacer, apparently, when mated up to G30/G11 calipers on the F25.
For the last question, the F26 X4 M40i disk and caliper setup bolt up to the F25 X3 directly. |
Thank you for the clarification on the calipers. Now that I'm looking for it, I can see the marking on the back of calipers. I'd think the Tro-Nik setup uses the 374x36 caliper, right? To your point, if one wanted to re-create that set they would need to source the 374x36 calipers, the pads, the E60 M5 rotors, and then figure out a solution for a hub-centric ring. Maybe Tro-Nik would sell just that part.
On the F26 M40i question; I wasn't clear. I understand that the F26 caliper and rotor setup would bolt onto a F25. My question was; would a F26 M40i 348x36 rotor work with the smaller 348x36 Brembo caliper. I think what you're saying is the hub portion of the 5x120 F26 M40i rotor has too wide of a diameter, which would interfere with the smaller 348x36 caliper. Looking at pictures of the setups it also looks like the brembo caliper uses a pad that's a lot taller than the standard F26 M40 pad, so even if there wasn't an issue with the bub of the rotor, I think the Brembo pad would be too tall for the designed sweep area of the F26 M40 rotor.
I think the Brembo 374x36 caliper, with the E60 M5 rotor, and the supplied hub-centric ring is a more practical solution than the 6-piston 400x36 M5 caliper kit.