"85 Lemans 1000 Brake rotor upgrade?

[mgmark]

I'm looking for a 300mm brake rotor that will either bolt onto the wheel, or replace the outer ring of the stock disc on my Lemans IV. The stock disc center uses five bolts to mount onto the wheel, and the outer disc mounts using "floating" buttons.
As much as Guzzi interchanges parts between models I'm hoping there is a relatively straightforward swap.
thanks
Mark

 

[ghezzi]

What size bolts?
What PCD?
What size centre hole?
What offset?

May I suggest a caliper upgrade, like Brembo 4 spot Goldline series. Mounting plate will need to be manufactured, so at least the disc offset becomes optional as you can accommodate that with the plate.

T-ruck it, go the whole hog and do a 17" wheel upgrade ............................ may I suggest BST?

Whichever way you go, weigh everything and make sure every new component is lighter than the original, you won't believe the difference it makes to handling and speed of direction changes.

 

[mgmark]

I appreciate the advice but I'm looking for a stock appearance with this bike. I want to go more retro style instead of modern superbike type upgrades. I took off the original 16" front wheel and went back to the 18". Until I can replace the stock 270mm rotors with something larger, say, a 300mm, I'm wasting my time.
The disc is held with five 8mm bolts on a 110mm bolt circle.
PCD?
centre hole is 95mm
the stock disc is flat, but a 10mm offset would be nice. I can machine spacers for the offset if needed.




thanks

 

[guzzigray]

I'm looking for a 300mm brake rotor that will either bolt onto the wheel, or replace the outer ring of the stock disc on my Lemans IV. The stock disc center uses five bolts to mount onto the wheel, and the outer disc mounts using "floating" buttons.
As much as Guzzi interchanges parts between models I'm hoping there is a relatively straightforward swap.
thanks
Mark

hmb-guzzi.de/shop/product_info.php?info=p2166_brake-disc-front-300-mm--cali-3--cali-1100--sp-3-etc--stainless.html

Looks like this is a 300mm version for the stock 270mm piece. Further on in the brake section they advertise rotor buttons for 270/300mm fitment so I'm assuming these disks fit the MK 4 carrier ……. ???

 

[mgmark]

Yes, that is along the lines of what I'm looking for. I want to increase the diameter. Kind of pricey but it works if the bikes use the same center as mine.

MG Cycle lists what is probably the same item. I need to call them and ask if they know if it will fit my centers.

mgcycle.com/index.php?main_page=product_info&cPath=110_134&products_id=1108

thanks

 

[mgmark]

I checked with MG Cycle and the disc centers are different between my bike and the 300mm discs will not fit.

 

[amainie]

Looking for exact the same thing… Changing 16" to 18" front wheel on Le Mans 1000 '89
Maybe this can help:
mgcycle.com/index.php?main_page=index&cPath=110_134
guy with experience:
mgcycle.com/index.php?main_page=page&id=26

 

[mgmark]

I asked Gordon about that 300mm Brembo kit for the Lemans and it was discontinued over a decade ago.

 

[jbump85]

I'm looking for a 300mm brake rotor that will either bolt onto the wheel, or replace the outer ring of the stock disc on my Lemans IV. The stock disc center uses five bolts to mount onto the wheel, and the outer disc mounts using "floating" buttons.
As much as Guzzi interchanges parts between models I'm hoping there is a relatively straightforward swap.
thanks
Mark

Hi Mark,
I work for Revival Cycles in Austin TX. We recently installed Lemans I wheels on a Lemans IV. In doing so we had to make a caliper relocation bracket to accommodate the 300mm rotors. We would be happy to make a set for you if that helps. The # is 512-291-3377 ask for Chris or John. My name is John. Also you can reach me at John@revivalcycles.com.

 

[mgmark]

Thanks John. I have just about accepted that I will need a wheel change to get larger brakes. I may go back to wire wheels because I like the look.

Mark

Hi Mark,
I work for Revival Cycles in Austin TX. We recently installed Lemans I wheels on a Lemans IV. In doing so we had to make a caliper relocation bracket to accommodate the 300mm rotors. We would be happy to make a set for you if that helps. The # is 512-291-3377 ask for Chris or John. My name is John. Also you can reach me at John@revivalcycles.com.
View attachment 7781

 

[Patje]

Hi Mark,

I am looking for the same solution and found this:

bikehps.com/isr/isr_brake_discs.html

and this cool order form:

bikehps.com/isr/ISR_Custom_Disc_Order_Form.pdf

Had to make an account to this forum, to tel you this, hope it will help.

Or did you find a other solution to the Le Mans brakes?

Let me know if you did

Cheers

Patrick

 

[Madkoffe]

So If i buy a 18" frontwheel from newer lemans on my 1987 with 16", i need that brakespacer then?

 

[john zibell]

So If i buy a 18" front wheel from newer lemans on my 1987 with 16", i need that brake spacer then?

Only if you go to the larger brake disk.

 

[Madkoffe]

ok, does the 18" wheel have bigger disk against my 16" wheel?

 

[Bigbear]

Queried a Mk5 for sale here in NZ that had a larger rotor kit, owner said it was a UK conversion (as was the twin headlight fairing).
See picture attached.
I think a spacer for the front caliper was made, similar to what a member offered above.
Maybe try a MG forum in the UK?
Re Madkoffe - stick with the 16" -quicker steering & DR John had no problems with them - PS like your L.E. Guzzi (high gearing?).

 

[john zibell]

ok, does the 18" wheel have bigger disk against my 16" wheel?

You can check parts manuals, but I believe it is the same disk. I converted one for a guy many years ago but I think the same rotor was used on both 16 inch and 18 inch wheels. What matters is axle to rotor to slider dimensions.

 

[Shrek]

Not sure this option is what your looking for.
I was also unimpressed with the std 270mm discs and wooden calipers.I couldnt justify the huge cost of the Brembo goldline kit or find a suitable period upgrade.
Being a fitter/machinist and always looking for a challenge i decided to make my own kit.
I fitted a set of 300mm ZX10 Kawasaki discs to my Lemans V 1000.
While not a simple bolt on,they have five holes and no offset ,like the originals.
All i had to do was machine the I.D a little larger and slot the hole PCD a liitle to suit the 18" wheels holes.
Guzzi went to 270mm discs to fit inside the 16" wheels and then lazily kept them when they went back to 18".
With the addition of 4 pot calipers from a Honda Sp1(Rc45) the brakes went from pathetic to superbike standards.
Quite a cheap upgrade with older kawasaki discs going cheap on ebay and i already had the calipers.
While the discs could be used on their own.It would be necessary to fabricate caliper brackets anyway,so why not step into this century with a caliper upgrade while your at it.
With HH pads the linked brake set up is now amazing and requires little effort for massive braking force.

 

[Madkoffe]

dropbears.com/s/sda/p62.htm

 

[rangi]

hmb-guzzi.de/shop/product_info.php?info=p2166_brake-disc-front-300-mm--cali-3--cali-1100--sp-3-etc--stainless.html

Looks like this is a 300mm version for the stock 270mm piece. Further on in the brake section they advertise rotor buttons for 270/300mm fitment so I'm assuming these disks fit the MK 4 carrier ……. ???

First post for me, try Metal Gear in Australia. I'm doing the same thing with my LM. The rotor they have should fit straight on, their SKU/Part No- 21-136-BK. Good luck, Rangi