Rear Brake Caliper Mounting - Zane

I have new billet ones modelled on the Zane caliper bracket as I needed 3 off them for my race bikes

I may have an original Zane version as well as I had one we used for the model, will look this afternoon
 

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redax5 said:
I have new billet ones modelled on the Zane caliper bracket as I needed 3 off them for my race bikes

I may have an original Zane version as well as I had one we used for the model, will look this afternoon
Click to expand...

Thanks Red

Please let me know.

I made this hanger some time ago for my lightweight 750 twin project.
.. but why reinvent the wheel ?

A WM4 2.5x18 Borrani rim laced on a modified KTM LC4 rear hub BTW.

Cheers
Stéphane

IMG_20260218_130614241-1920-web.jpg
 
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steph said:
Thanks Red

Please let me know.

I made this hanger some time ago for my lightweight 750 twin project.
.. but why reinvent the wheel ?

A WM4 2.5x18 Borrani rim laced on a modified KTM LC4 rear hub BTW.

Cheers
Stéphane

View attachment 102733
Click to expand...
Steph,

Does the KTM hub have a cush drive? If not, I'd give that decision a serious re-think, especially if you have rare CR bits fitted.

A race team for which I once tuned/maintained engines used a similar hub in their triples and constantly broke gearbox gears, despite the 'boxes being in excellent condition. I advised switching to a cush-drive hub, the weight advantage was apparently more important... gears continued to desintegrate.

As this was the only case of this happening amoung the various race/track engines I maintained, I figured the obvious cause to be the lack of a cush drive, everybody else used them!

piet
 
sfcpiet said:
Does the KTM hub have a cush drive? If not, I'd give that decision a serious re-think, especially if you have rare CR bits fitted.
Click to expand...

Hi Piet,

Thanks for your interesting comment !

Yes it does have the cush drive.
.. and a CR gear-box as well :)

The question didn't even arise.
For me, it was obvious.

In the meantime, thanks to Maurijn on the Zanelist FB group, I have found a 650/668 brand new complete rear caliper support in the Netherlands.

Cheers
Stéphane



IMG_20260218_173554972-1920-web.jpg
 
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Out of interest, what's the bearing arrangement in the caliper mount (that allows it to 'float' on the axle with a frame mounted torque arm)? I made my own and initially had it mounted on a ball cartridge bearing but was finding it allowed lateral movement of the caliper and the pads would retract and require a couple of foot pumps to get the pads back in contact with the disc. I cured it by fitting a second bearing in side tandem.

Rear caliper carrier.jpg
 
It's a simple sealed ball bearing Quentin. Starts to rattle and slop around after a while, like they all do! Especially when rolling backwards when the heim joints of the anchor join in on the rattle. ;) Nothing dramatic, just supports my opinion of poor design decisions.

I prefer using plain bushes, these do require a smear of grease every now and then though. The older GSXR items, right up to the K5 (I think) models are perfect for me, just won't fit the sexy Brembo calipers. Most early versions are nicely made with a quad ring seal at both ends of the bush, keeping grease in and water and grime out. The later GSXR Nissin calipers are about the same weight and almost as sexy as the Brembos though. Their biggest advantage is that the bleed nipples are on the correct side, ie, point upwards, making brake bleeding a hassle-free 5-minute affair ensuring the system is air-free at the first attempt.

piet
 
KTM decided no cush right from the start of these lightweight off-roaders, and they specifically stated that road use would stess there gear boxes. They make that gadget in New Zealand, and maybe they might make specials if asked.
 
I ran without cush with a mx hub on my race SF for over ten years without gearbox problems. Did it on the advice of other classic guys racing bikes with half as many horsepower again as my gutless Laverda. Now that it is going back on the street I am looking for a lightweight cush rear disc hub.
With the floating caliper carrier I have the rod pulling from in line with the bracket plate which has a normal ball bearing to the axle, it has never kicked the pads out.
 
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