New Cush Drive

Rohan said:

Or, could just use the stock Mk 3 Commando cush drive and disk brake !
Its more of a cush than previous - so why reinvent the wheel ? - quite literally.

Click to expand...

sounds like an ~ ? easy retrofit option for earlier models?

bingo

Brooking 850 said:

My race bike tears up the small plastic/rubber items every other race meeting,

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any reports out there on the improved mk3 cush deal?

I received my new cush drive unit in quick order. The fit and finish is fantastic. This is truly a quality product and I appreciate the work that went into developing this unit! Worth every penny.

Hi Madass140,

What about a Mk3 alloy sprocket carrier? not only lighter but it would allow quick final drive ratio changes.

Dave

84ok said:

Rohan said:

Or, could just use the stock Mk 3 Commando cush drive and disk brake !
Its more of a cush than previous - so why reinvent the wheel ? - quite literally.

Click to expand...

sounds like an ~ ? easy retrofit option for earlier models?

Click to expand...

Depends on your definition of easy. The pre Mk3 swinging arm doesn't accommodate the caliper bracket adjustment/locking bolt, so you'd have to either weld on some plate and drill it, use the Mk3 swinging are, or use some other way to keep the caliper from rotating. You'd also have to fab up a mount, brake hose, and linkage for a rear master cylinder on the left side, since the MKIII mounts it on the right. It can certainly be done, but it is a fair bit of work.

One of the pluses for the Mk3 arrangement is that it is pretty simple to convert to replaceable sprockets by doing some machining on the stock sprocket.

Ken

converting to MK3 style is not a viable option as Ken has said, a one off maybe .
I'll be sticking with my version which is a "plug and play" design which does not require the owner to make any modifications to his bike.
I use it, others use it. the idea behind my design was to keep the original look but with benefits. great for those who want to keep their bike looking original.

Hi,
My supercharged Norton with a 75 rear end has a solid Honda axle with the Old Britts quick change sprocket carrier.
Fred's Quick change carrier uses aluminium sprockets made for dirt bikes cut into half and bolted to the carrier.
The sprockets are of a well known brand that everybody walks by at their local bike shop.
There is no need to un do anything except the chain tension & the bolts holding the sprockets to change ratios
I have several sprockets of different number of teeth that will bolt on in about 10 min. or so.
I have only used one of the sprockets so far . It has several hundred miles on it with no apparent wear.

Fred @ old Britt's developed it And I think it is a great idea. I mention this because if you are going to make a new product, the quick change option should be something to consider. It only requires the bolt pattern to be the same as the available sprockets.
I believe Fred only made 3 and I have one.

Bruce MacGregor

I wonder why Fred only made 3

Fred told me they were CNC machined from a large chunk of aircraft grade AL.. and too expensive to reproduce in quantity for the existing market!
The one I have was on his Race bike for a while.
But it works. Great idea.
Madass, give him a call and talk to him!

Bruce MacGregor

Hi Again, Sprockets are PBI, #5054, >39, 40, 42, 43 teeth.

" and too expensive to reproduce in quantity for the existing market"
exactly.
I and many others are happy with the one piece axle new cush drive hub so I wont be venturing out on a new design.