Brake Configuration Issues, Part Deux

[XS-play]

...So.

Today I confirmed, I do have the 17" rear wheel. I am cool with that, Franken-Bike and all. I have all the major rear brake components required for either bike configuration, S or SG. One minor issue.

I recently purchased the SG spacer collars for both front and rear wheel axles, from Andreas. Great thanx to Andreas for those parts.

I am going to go with what I have, and I am pretty sure that I can just set up the rear brake as an SG. I do not have the thinner axle spacer to go with the S torque plate, etc.

Is there an offset in the rotor on the two variants of the wheels, that could prevent me running SG rear brake parts on the 17" wheel?


Front Brake Update:

Mocked up the front wheel, with the new bits from Andreas, it went together smoothly, with one minor hitch. The Right Rotor is very close to the outside edge of the machined slot in the fork casting, the Left Rotor looks to be well centered in the slot on left casting (images below). Like I said, I just did a mock up, and did not cinch down the axle nut. There is an air gap between the right fork casting and the spacer on the axle of about .050" - .060". Some of you might be thinking the fork stanchion tube could be bent, well I loosened the triple tree and rotated the tube, and there was no change in the rotor in the slot or the air gap. I have a rear axle washer, fits over front axle, that is about .125" thick and this would prolly bring the rotor into the center of the slot. If the washer is too large in diameter I could easily turn a shim to fit, on my lathe. Does anyone have concerns about "stick-ion" on the sliders, if I put a slight sideways preload on the fork?

Right Front Rotor


Air Gap


Left Front Rotor

[Bax]

Loosen the pinch bolt and slide (may need a bit of leverage) the fork away from the wheel until the rotor is centered in the slot. That "air gap" is expected with specials. It actually uses the larger diameter step on the axel to hold the front wheel when the castle nut is tightened on the left side.

---Bax

[bikerphil]

Is there an offset in the rotor on the two variants of the wheels, that could prevent me running SG rear brake parts on the 17" wheel?

All the XS11 rotors should have the same offset. Or very close, maybe a few thou. difference.
The axle spacer for the Special 16" wheel is about 1/2" shorter than than the one for the Standard 17" wheel. This spacer lines up the caliper holder bracket with the rotor. You will probably have to add something in there to get correct alignment.

[bikerphil]

Pic # 1 is the Standard model setup with the 17" rear wheel. Note the large spacer between the caliper mount bracket and the torsion plate. Also note the thin bearing cap at the wheel bearing.

Pic # 2 is the Special model setup with the 16" rear wheel. Note there is no spacer between the caliper bracket and the torsion plate. Also note the wider bearing cap at the wheel bearing.

The Special torsion plate has a slot at the forward swingarm mount, while the Standard has a hole instead. Easy to identify them from each other this way.

[XS-play]

All the XS11 rotors should have the same offset. Or very close, maybe a few thou. difference.
The axle spacer for the Special 16" wheel is about 1/2" shorter than than the one for the Standard 17" wheel. This spacer lines up the caliper holder bracket with the rotor. You will probably have to add something in there to get correct alignment.

Okay, I didn't make my thought as clear. I have compared rotors and yes they are all the same, I was thinking there could be an offset machined into the hub/rotor mounting surface of the wheel. I did not have a 16" wheel to measure and compare the offset. I can see in the two images there is a difference between the 16" and 17" wheels.

I will need to source a Standard Bearing Cap and I need the Spacer the goes between the casting and the torque plate.

[XS-play]

Loosen the pinch bolt and slide (may need a bit of leverage) the fork away from the wheel until the rotor is centered in the slot. That "air gap" is expected with specials.

Interesting, thanx for the info, I think I will turn a spacer to fill that gap, I have some UHMW that will be perfect. Not comfortable relying on the pinch bolt to hold everything in alignment.

[bikerphil]

The pinch bolt actually holds the fork leg better to the axle than no pinch bolt (poor design) on the other side.

[XS-play]

bikerphil

I am sure it does a fine job, but I just like the repeatability of having a shim that will hold everything in tolerance. Maintenance in the field is much easier. Besides, any excuse to fire up the ol' lathe. LOL

[DiverRay]

But, the front wheel bearings and seals are NOT designed for a shim! You may find a lot more wear/problems with a shim in place.
When putting the front end back together after a tire change, it's best to just snug all the bolts, then starting from the bottom work your way up. Doing that, you first set up clearance for the rotors and then keep the forks in line. That and a fork brace, if you can find one, will keep the bike handling as best as possible with 40 yeqr old design.

[XS-play]

DiverRay

There is a spacer inside the wheel that carries the load path,both the left and right inner races are captured by the spacer inside the wheel and the outer hardware. The shim will simply be there to provide support for the slider. I don't see how a shim will have an adverse affect.

Peace, Wolf

[bikerphil]

The axle itself actually acts as a spacer for the bearing side load. Works in a similar way on the rear wheel.