Ebay, won rear disc,

[thunderace]

not all brands use the same alloys to make the discs.

Alloy brake discs?

[pip]

not all brands use the same alloys to make the discs.

Alloy brake discs?

Technically correct.
Alloy being a combination of 2 or more metals as opposed to Aluminium or Aluminium alloy.

Pip

[porndoguk]

not all brands use the same alloys to make the discs.

Alloy brake discs?

Technically correct.
Alloy being a combination of 2 or more metals as opposed to Aluminium or Aluminium alloy.

Pip

+1 Alloys are mixtures of metals

[speedy231278]

Ummm.... 4.8mm thick, and the service limit is 5.0....

Argh yes! I shouldn't post half asleep. I read it as 4.8mm of wear left to wear (remaining) not remaining on the disc.. stupid now I think the original wear area is only 2mm.

For clarity in this thread.

OEM discs

Fronts are 4mm with 3.5 being the service limit.
Rear is 6mm with 5mm being the service limit.

That also brings up something that interests my penchant for thinking too much. I'm pretty sure EBC and whatever factory/sweatshop/bloke in a shed that produced my front discs have stamped 4.5 as the limit. Or maybe 4.0. However, I trawled eBay and I'm sure found discs that started as 5, 4.5 and 4.0mm, and those which stated wear limits were all 1mm of wear. I've just looked at the Honda service sheets to confirm the figures stated above (and they are correct, as I suspected), but it just makes me curious as to why aftermarket discs might be made thicker than the OEM ones? Usually they're all about trying to persuade people they're lighter, stronger and better!

[xivlia]

well i got an email from the guy and he said that the disc was just over 4.5mm..... and i told him to give me a refund if he hasnt posted it yet because thats below the 5mm limit... no reply. i also googled arashi wavy disc for nc30 and found out that they come brand new 5mm.... which IS the limit... why is this? it makes no sense....

[Neosophist]

well i got an email from the guy and he said that the disc was just over 4.5mm..... and i told him to give me a refund if he hasnt posted it yet because thats below the 5mm limit... no reply. i also googled arashi wavy disc for nc30 and found out that they come brand new 5mm.... which IS the limit... why is this? it makes no sense....

You are not understanding.

Ummm.... 4.8mm thick, and the service limit is 5.0....

Argh yes! I shouldn't post half asleep. I read it as 4.8mm of wear left to wear (remaining) not remaining on the disc.. stupid now I think the original wear area is only 2mm.

For clarity in this thread.

OEM discs

Fronts are 4mm with 3.5 being the service limit.
Rear is 6mm with 5mm being the service limit.

OEM are Original Equpment (HONDA) discs.

arashi or whatever will specify their own thickness levels for their discs. You should check with them what they spec as minimum thickness for their disc, not a HONDA disc.

For exactly this same reason, that the brake disc you purchased on ebay might be within tolerances for that manufacturer

[xivlia]

oh i see okay, now i get it, thanks.

[marcus57]

Those disc's were sold by a chap on ebay for £45 plus post new, I have two of them and they are fine.
From memory they are made in the UK aswell.

[porndoguk]

Ersan have you recieved the disc yet?

[xivlia]

nope not yet, i was hoping to get them today. but nothing came yet. maybe tomorrow, if not i will contact the seller.