410mm discs

[pete2144]

Evening all,

I'm in the process of upgrading my front discs, I have the LOBA 390mm set up at the moment but looking to go bigger, I know there is a lot on here about it, all I can find about a 410mm disc is that it wont fit keeping my standard Brembo Callipers, what is the reason as I've had a measure and I have 15mm clearance between wheel and calliper and would only need to space it by 10mm to allow a 20mm bigger disc?

Cheers Pete.

[IanH755]

Pad sweep on the disc is the reason, the 390mm pads can sweep 405mm so while you can fit bigger discs the pad would still only be sweeping 405mm, making the extra cost of a 410mm setup a bit excessive for 5mm of unused disc.

[pete2144]

oh I see, so I would have a 2.5mm line of unused disc right?

[pete2144]

or space the Calliper to its max a further 2.5mm?

[IanH755]

oh I see, so I would have a 2.5mm line of unused disc right?

Yeap.

or space the Calliper to its max a further 2.5mm?

It's the pad size which is fixed to a maximum 405mm sweep, not the caliper spacing, which would only change where the 2.5mm unswept area was.

[pete2144]

ok great thanks...

[IanH755]

After saying all that however, it also depends on the 410mm disc you're buying TBH. If the width of the friction material is just narrow enough for the pad to make full contact then the outer diameter can be really large but you'd still be able to use the same "narrow" pad. Here's an example of what I mean -



with these Brembo Discs see how "thin" the friction material is compared to the width of the "disc". So if your 410mm discs were built like these you'd be able to still use the narrow pad without any unswept area.

Now compare the width of the friction material in the above pic to the amount in my 410mm AP discs below, which are more like "normal" road discs rather than the Race discs above.



So there is a possibility of running the 390mm pads *if* you're getting a custom disc made but for "off the shelf" discs you'll be stuck.

[pete2144]

thanks Ian...

[pete2144]

So they're on 410mm AP Racing discs with standard Callipers with 10mm spacer, I think I will add a further 2mm to the spacer so there will be no unused disc edge, the calliper is about 5mm clear of the wheel at the moment...


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[Andyevo]

Looks good Pete, think I might go down the same route myself, good work.

[pete2144]

12mm spacer now fitted, no rubbing issues, so now brake pads are used right to the edge of the disc