Monster 900Sie 50000mile refresh.

[Nasher]

Only the 748R and 998R had the 15mm offset discs, not the 'lesser' versions, the 'R' is key.

I think it's because they were fitted with Ohlins Forks(pre-Radial), and the caliper brackets put the Calipers further out.

I've just measured a spare set of Brembo discs that came off my M1000 and they are @10mm offset.
I need to make sure the 'R' discs are measured the same, but have popped off a message to the guy I know has some and asked him to measure them.

Some additional info.
Your disc carriers look quite chunky.
The Brembo ones on my 1000SS and M1000 are both only @4.5mm thick.

I also removed a disc bolt from my 999, which has the low profile domed heads bolts I linked.
The head is just 4.2mm high when fitted.
Your nice shiny ones look a lot higher than that.

On the 999 they are fitted inside deep pockets in the Disc carrier, and only protrude @2mm.
The 999 discs are still only @5mm thick, so at the bottom of the pockets are only @3.8mm thick.
I wonder if you could get your discs pocketed to around the same thickness.

Aaagghhhrrrrrr, why aren't you closer?
This is the sort of 5h1t that keeps me alive, I'd have the whole front end of your bike in my garage by now working a solution if I could.

[Mr Gazza]

Thanks for you dedication to this Nasher, I'm sure we would cook up some devious plots if we were closer neighbours!

Right. I've trawled the misty web and only found one reference to offset for "R" discs @ 11mm which just sounds wrong? maybe they have measured the offset to the inside face of the rotor? https://www.ebay.co.uk/itm/294292137...Bk9SR97W0PipYw

My Ti bolts miss the speedo by about a mil at most. (In the standard forks with no disc spacers.)






Original bolt heads are 7mm high.
Ti are 6.5
Some random button heads are 4.5 (could be 4.2?)
My carrier is 5mm thick.




Counterboring might be the way forward, but the carrier would go down to 3mm using button heads. That might be pushing it? What do you reckon?

[Mr Gazza]

These are the lowest head M8 bolts I can find at the moment, but would need the carrier holes taking out to 10mm and a bit of the spacer, to clear the shoulder and then a counter bore at least .5mm deep x 16.

https://www.raceti.com/product/suzuk...olt-m8-x-22mm/

It's sort of what I had in my head when I described a grub screw with a flat head.

[Darren69]

Those disc bolts appear to have a flange, if you get some without will it clear then?

[Darren69]

First dibs if you can't sort it and decide to sell it all? PM me, ta

[Nasher]

Lets work this out then.

With no spacers under the discs, and 6.5mm head height Ti bolts you've got 1mm clearance.

Adding the 4.5 spacers gives you 2mm to get a bolt head in there and maintain the 1mm gap.

I've had confirmation of the dimensions of 748 discs, but need to go and mock the gaps up on my M1000 before committing that they would definitely work.

The ones I know about are for sale, but I'd need to see them to access their condition.

[Dukedesmo]

You'll need the 15mm offset discs.

When I did the Ohlins forks conversion to my 916 they have the bigger offset and whilst spacers would have worked (as I don't have a mech speedo), they don't fit with the speedo drive also, I'm not convinced spacers are ideal as the discs will no longer sit in the wheel properly and so are not held by the 'lip' on the hub.

I've got Brembo HPK discs (6 hole 15mm offset) and when the ally carriers wore out but the rotors were still good I bought replacement carriers from Mode Performance, very helpful and much cheaper than new discs.

I've also got a pair of (unobtanium) 748R 15mm offset discs as spares (sorry not selling) if you need any measurements etc.

For the record the 15mm offset/6 hole discs are harder to find as they were only fitted to the 748R of certain years and, I think 998R? Later SBK models, although 15mm offset used a 5 hole disc which you could use if you bought a new wheel but then the speedo drive won't fit.

Brembo do (or did) make the 15mm offset/6 hole in the 'serie oro' discs but you need to double check before you buy as many sellers don't know the difference.

Luckily the radial brake setup on my Monster uses the 10mm offset discs as they were made for that vintage of bike, all the later models use 15mm offset for better disc cooling, I presume?

I would try Mode Performance first though as I'm sure he can help.

[slob]

IIRC GSXR1000 has discs that fit xx8R models

EDIT: Brembo website doesn't back this up, although I suspect bad data since it lists 748R as 10mm offset

[Nasher]

I've just measured 4 different sets of 6 bolt discs I have around the place.
All 8 discs come out at 9.5mm offset, on the unswept part not the worn parts.
With the 4.5mm spacers currently in place that gives 14mm offset either side.

My contact has confirmed the 748 discs are 15mm offset, measured the same way as I'm measuring the 9.5mm above.

That means of course that using the 15mm offset discs the discs will be 2mm further apart, or in other words 1mm further out, or offcentre to the radial calipers.
I've looked at the setup I've done on both my 1000ss and M1000, and both would easily accommodate this, but are slightly different.

Gaz, have a look to see if a mm either side would work for you and let me know.
I'm happy to buy the discs, which are available for a good price, and send them up to you.
You can pay me if they work, or send them back if they don't and I'll use them myself.

[Mr Gazza]

Thanks Tim and Rob for the good info and support.
All the GSXR 1000 discs I've found have 5 holes and no mention of the offset, But I do know that some GSXR parts are interchangeable with Ducati.

I think Nasher and I have come up with a plan. Watch this space.

[Dukedesmo]

Originally Posted by Nasher

That means of course that using the 15mm offset discs the discs will be 2mm further apart, or in other words 1mm further out, or offcentre to the radial calipers.
I've looked at the setup I've done on both my 1000ss and M1000, and both would easily accommodate this, but are slightly different.

When I fitted the HPK discs to the 916, I recall having to alter the alignment slightly by altering the RH spacer.

IIRC I got a new alloy spacer made at around 0.5mm bigger than the original (which is why I've got the steel spacers spare) and the reason for this is the HPK discs are 6mm thick rather than 5mm of the 748R and other Ducati discs whereas the inside of the caliper is only around 7-8mm, so alignment is critical so as not to touch the caliper body with the disc.

In hindsight I think they were just OK and not touching but my OCD wouldn't let it go that close but, being full floating I imagine they would find a way to clear anyway?

Otherwise I think you'll find the 15mm offset will be fine but if not you can just alter it by machining down the spacers or fitting thicker spacers/adding shims, the only potential fly in the ointment is the speedo drive might not be easy to machine but maybe you could remove material from the inside of the fork leg or the wheel if absolutely required? but, that should only be the case if you needed a narrower stance and it sounds like you may need it wider?

This is a 748R disc BTW;



Let me know if you need any measurements.

[Mr Gazza]

Thanks for all the info DD. It has pulled it all into focus.

Quite exhausted by it all actually, not sure whether to persevere with the new front end or not!
I did get all the paint off one of my tanks though. I bought some paint stripper from Screwfix and might as well have put yoghurt on the tank!!
Dacs' strong stuff was much better.
In the end I finished it with 80grit and wire brushes which was quicker and cleaner altogether than paint stripper.
So that's how the other tank will be stripped.

[dunf]

Originally Posted by Mr Gazza

Thanks for all the info DD. It has pulled it all into focus.


I did get all the paint off one of my tanks though. I bought some paint stripper from Screwfix and might as well have put yoghurt on the tank!!
Dacs' strong stuff was much better.
In the end I finished it with 80grit and wire brushes which was quicker and cleaner altogether than paint stripper.
So that's how the other tank will be stripped.

I've a flywheel from a 2-stroke needing paint removed. Not really suited to abrade as access is difficult in and around all the fins. What is this Dacs strong stuff you refer? Would you happen to have a link? Ta muchy

[Mr Gazza]

The stuff you can try dunf is from Frost Automotive https://www.frost.co.uk/frost-strip-gel-500ml/
The preferred method years ago, if it was small enough, was to chuck it in a bucket of thinners or Acetone. Not so cheap to fill a bucket these days though!
The Frosty stuff is better than yogurt, but you'll still need to be patient and expect to need at least two applications.

Thanks Darren. I think I'll stick with my trusty old cap, but the thought of my bike singing HELLO to me as I went to mount is very appealing.
Anyone got a version that plays the intro to Start Me Up, or any other super cool Stones into? (I love them all. )

[Darren69]

Replied to your PM Mr G.