Looking for dimensioned drawing for brake caliper adapter

[rbm]

Hi,

I'm swaping out the standard snowflake rims on my K75 for three spoke rims. The 3 spoke front has floating 305mm disks whereas the snowflakes are fitted with the standard 285mm disks.  I know that fitting a K1004V front end is one solution but I don't want to use that unless needed.  Larry Romestant addressed the caliper repositioning problem using a disk adapter:



I'm wondering if a dimensioned drawing for this type of caliper adapter exists.  Better yet, are these adapters available for sale?

[Inge K.]

The three spoke front rims which was mounted on the K75`s did use the 285 mm discs.
The 305 mm discs was used on the K11`s (and R11`s).

Inge K.

[frankenduck]

I'll never understand why Larry did things that way.  Why install 4V the front wheel with floating rotors and then build a custom adapter for a 2-pot caliper when the 4-pot calipers with a 20mm master cylinder are light years better in the braking department?

And aside from giving you much better brakes and not having to do anything custom, swapping in a complete 4V front end gives the bike beefier suspension and the stock setup has progressive springs from the factory. That's what I did on my K75 and it works great.

[rbm]

The three spoke front rims which was mounted on the K75`s did use the 285 mm discs.
The 305 mm discs was used on the K11`s (and R11`s).

Inge K.

That is true, Inge.  In this case, I happen to have all the correct components on one of my bikes and I am thinking about just doing a complete front end swap between my K100 and K75 -- forks, brakes, rims and tires and leave the tripple clamps in position as they came.

The alternate move I'm contemplating is replacing the 2-pot Brembos with 6-pot Nissins, as well as upgrade the front MC to a 20mm K1100 MC.  That route would require me to manufacture an adapter plate.

One of the constraints I'm working under is SWMBO's standing order to sell one of the bikes ASAP. So the solution has to be quick to implement and cost effective.  Unfortunately, there are hidden costs with the front end swap that I have to consider.

[rbm]

I'll never understand why Larry did things that way.  Why install 4V the front wheel with floating rotors and then build a custom adapter for a 2-pot caliper when the 4-pot calipers with a 20mm master cylinder are light years better in the braking department?

And aside from giving you much better brakes and not having to do anything custom, swapping in a complete 4V front end gives the bike beefier suspension and the stock setup has progressive springs from the factory. That's what I did on my K75 and it works great.

Duck, in the Larry Romestant interview on Youtube (below):


Larry states that his motivation for this decision was to increase brake feel at the lever while still providing adequate overall braking power.

You have  very good points about the suspension advantages of the K1004V forks over the standard ones; and these arguments I am taking into consideration as well.

[frankenduck]

If you're very patient, eventually a complete front end will come up on Fleabay.

[Inge K.]

At the top in this thread you can have look at some low budget version adapters.

Inge K.

[Rick G]

One thing to be wary of is that the K75 and K100 had different fork leg diameter, about .3mm I believe, just enough to be a PITA

[Inge K.]

Similar up to 08/91, after that Showa was used on the 75...which correctly is 0,3 mm smaller (41,0 mm).

Inge K.

[specialkslarry]

I'll never understand why Larry did things that way.  Why install 4V the front wheel with floating rotors and then build a custom adapter for a 2-pot caliper when the 4-pot calipers with a 20mm master cylinder are light years better in the braking department?

All you have to do is ask. There are several reasons for using the 2 pot calipers and 20mm master cylinder.  The braking power is more than adequate for both the K75 and K100/1100/1200's. I have not had any customer complaints regarding braking performance. The feel is progressive yet firm at the lever. On the 'Executive' I used the 13mm master and 305mm/2 pot caliper combination with no issues. The lever response is good.  The 4 pot brakes are not really light years better. The 305mm/2 pot calipers and adapters are used because the K75S tune-able forks are used.  The S fork is the only one that can accommodate dampening modification. Both legs are valved for compression and rebound making them extremely compliant without sacrificing ride quality or bottoming out. One of the most welcome characteristic is how little they dive compared to the standard Showa forks. On' Beauty' and 'The Beast' the wheelbase is the same as the 100/1100 RS, and with the 17" quick steering front wheel on Beauty the long wheelbase handling is fine. The  lowered stance brings down the center of gravity, makes the bike feel less top heavy and allows it to handle very well, similar to the RS.  Nothing grounds when leaning aggressively, but your feet will contact the tarmac a bit sooner than normal when you really push it over. The Beast on the other hand was designed for boulevard cruising but it was very stable in the Corkscrew at speed at Mazda Raceway with the 18" front wheel when I rode it there a few years ago with my wife as pillion making a movie of the ride!

The 1100 series upper and lower triple clamps are deeper and thicker, making the use of classic headlight ears less practical because they are considerably shorter than the span between the upper and lower trees.  I have used the larger diameter tubes in the K75 triple trees by reaming the holes to primarily retain the ABS II more than for the 4 pot setup. Also, the aluminum fork bridge is not compatible with the 1100 series fork stanchions and the flat metal brace with plastic cover has to be used, another consideration regarding aesthetics.

That's my spin and I am sticking to it.