Slabside Brake rotor swap.

[dynodave]

Is there a 320mm alternative front disc that will fit an 18" slabbie front wheel? (750 is 300 and 1100 is 310 I believe?) Cheers

Edited February 8, 2023 by dynodave

[Joseph]

Yep there are, but with a smaller offset (which is good, because you can accommodate by spacing the calipers inwards) :

ZZR1200 discs on my ex Katana slabside rims on SRAD fork

 

Edited February 8, 2023 by Joseph

[Joseph]

ZX12R also, and maybe a couple other Kawasakis

[dynodave]

16 hours ago, Joseph said:

Yep there are, but with a smaller offset (which is good, because you can accommodate by spacing the calipers inwards) :

ZZR1200 discs on my ex Katana slabside rims on SRAD fork

 

Thanks Joseph 

[Joseph]

No probs. Took me quite some searching on eBag and Google cross referencing given dimensions.

FYI the discs on that bike I built, with the factory looking GSX slots rather than classic drilling were made by Japanese brand Keito. Not much info on them and i got these new/second hand off eBag DE but styling is  for this kind of mod

[Metralla]

What is the offset (outer surfaces)of the OEM 1100 discs?

[Joseph]

20mm offset, 22.5mm to outer surface of disc i think ?

[Metralla]

9 minutes ago, Joseph said:

20mm offset, 22.5mm to outer surface of disc i think ?

Is it 22.5mm from the wheel to the outer dsic face? So If you put the discs on a flat surface their total height will be 22.5mm?

From what I have learned, various disc manufacturers define offset differently.

[TonyGee]

1 hour ago, Metralla said:

Is it 22.5mm from the wheel to the outer dsic face? So If you put the discs on a flat surface their total height will be 22.5mm?

From what I have learned, various disc manufacturers define offset differently.

interesting, if you have a flat disc then their is zero offset from the inside of the disc, so should they be measured from the wheel mount surface to the inside of the disc ? 

[Dezza]

Some manufacturers clearly measure their disc offsets as the distance from the wheel mounting face to the middle of the disc, not the inner disc face. But then give flat disc offsets as 0mm, when it should be 1/2 disc thickness. And then we wonder why there is confusion when other manufactuers give offset as wheel mounting face to inner disc surface or outer disc surface . Lack of standardisation: what could possibly go wrong (e.g. electric car chargers).

Edited February 18, 2023 by Dezza

[Metralla]

3 hours ago, TonyGee said:

interesting, if you have a flat disc then their is zero offset from the inside of the disc, so should they be measured from the wheel mount surface to the inside of the disc ? 

As @Dezza said, it has also to do with the disc thickness. So the wheel surface to oute disc surface gives the maximum space the OEM claims and then aftermarket guy know he cannot go beyond that. With a flat disc, then offset==thickness, which again is the available space envelope.

So what is the offset according to this style of measurement?

[TonyGee]

yeah i originally thought the offset  was from wheel mount to the centre of the disc, but as time went on people where measuring from wheel mount to outer side of disc. you just end up going with the flow 

[Joseph]

The offset should in all logic be stating from mounting face to center of the disc thickness, because that distance does not vary with disc wear.

The 20/22.5 measure posted above is an indicator of both (actual offset as described above, and offset taking in account half the thickness of the disc.

Edited February 18, 2023 by Joseph