Looking for Brake Disc Dimensions T3/SP LM spoke

[Old Jock]

So I'm trying to determine the dimensions of the discs as installed to LMs and T3

This is to replace a set of Magni rotors on a Sfida 1000 which have warped but I can get no definitive info and wondered if anybody could assist.

From what I understand already I believe the discs have are 300mm diameter, 26.5mm offset (including the disc thickness) 5mm thick, hub diameter (to fit over the bearings on the wheel) 80mm and a bolt pitch circle of 101mm. That's what I measure off the existing Magni discs on the EPM wheels

I've been told these are identical to the discs fitted to the T3 and early LMs, hence the question.

The reason for this is to get a set of full floaters made by ISR but I need to be sure I have my dimensions correct, so if anybody can help I'd be very grateful.

In true scatter gun fashion I'm going to ask the same question on Guzzitech so apologies to those who frequent both forums

[guzzista]

AFAIK the early LMs ( 850 1, 2, and 3) all have deeper dish rotors peculiar only to those machines. About 36-37mm as measured on mine ( not necessarily accurate on my part, but definitely deeper that the  others (T3/SP, G5, Convert ) , with shallower depth dish.(26.5 in your measurement sounds about right.  Thickness on the ( iron) rotors is about  6.3/6.5-mm before wear ( 5.8 mi thickness at limit). Bolt pattern  and center is same for both as I had both off the bikes in the past and can attest to that. Perhaps another confusing bit is that some of the shallower dish Brembo discs  also came as a 2 piece item ( aluminum carrier, iron rotor) on G5 and  Convert ( these were the only models I saw them on) resembling the LM 1/3   as well a 1 piece  all iron  type. As far as thickness , perhaps all the stainless (later model) discs are about 5mm as opposed to the earlier  and thicker iron ones.  Hope this helps a bit.

[mtiberio]

Use the EBC rotors sold by MG Cycle. I sourced them as ebc never listed them for guzzi, just some one off laverda model. They replace the "25" mm offset rotors that came on touring guzzis with 195mm inter fork distances, not lemans 1 or 3 with 180 mm widths.

[Old Jock]

Thanks for the replies, its appreciated you took the time

Yeah the EBC are the same type I suppose I could get them direct from EBC, I'm in the UK and much as I like MG Cycle and supporting him, unfortunately Her Majesty also takes her royal cut in the form of customs duties and makes anything from the US cripplingly expensive.

Guzzista, thanks for setting me straight, on the differences.

The reason for going what seems like a convoluted route that's a heap of trouble, is I thought that if I am going to the trouble of getting new discs the cost difference between 300 and 320's is marginal compared to initial outlay. So the plan was to get ISR customs at 320 diameter to match the 6 pot ISR 32 series calipers already on the bike as these calipers are specifically designed for 320's (they do fit 300's) and a larger rotor will also help with heat dissipation.

However trying to confirm dimensions is problematic.

If going 300 then Stein Dinse also do a replacement that would bolt straight on

Jeez just as I type this I now see they also do a 320mm and give me all the measurements I need

So here is the link to both the 300s and 320s for info

http://www.stein-dinse.biz/Brembo/Brakre-Discs/Motorraeder/Brake-disc-320mm-Guzzi-Bimota-INOX::9314.html

http://www.stein-dinse.biz/Brembo/Brakre-Discs/Motorraeder/Brake-disc-VA-300mm-floating-T3-SP-LM-spoke::1682.html

[Old Jock]

Just to add if you click on the link for the item the 320mm rotor has superseded, in there is a pdf document in the photos for the TuV approval.

That document has a dimensioned drawing of the disc which can be downloaded.

Unfortunately minus tolerances but the best information I have managed to source to date

John