Locating the rear wheel

What happens if you put spacer '8' between spacer the 'top hat' spacer and the caliper holder?

[Allie]

Sprocket alignment should still be fine. It's set by the spacers on the LH side and the position of the bearing in the sprocket carrier.

I'm beginning to think that questioning the shop about any problems that might have occurred during the tire fitting and balancing could be worthwhile.

Perhaps so. I may very well give them a jingle before I go to work tomorrow. They're not open on Sun/Mon, and the owner will be back from a trip by then too. I went to high school with they guy and he knows these bikes inside and out, so he will make sure it's right if it's a matter of anything the man child on duty did to my wheel.

The event that caused this situation was either -I lost a spacer- OR -tech altered the bearings somehow-. I can easily believe I lost a spacer but there does not appear to be anything missing vs. parts diagram. I'm not sure how the tech could have altered the bearings if they sit on a fixed shelf in the hub. I will say that the central 'tube' in the hub between the two bearings is NOT loose, it's quite snug.

[GregT]

was the new tire spin-balanced on a machine? maybe the inner spacer has been missing for some time, and when the wheel was installed on the balancer, the cone-shaped ends that are used to secure the wheel were tightened too much. this could have pushed a bearing in, if no spacer was there. grasping at straws here.

i assume the sprocket alignment is now off by the same amount?

Sprocket alignment should still be fine. It's set by the spacers on the LH side and the position of the bearing in the sprocket carrier.

I'm beginning to think that questioning the shop about any problems that might have occurred during the tire fitting and balancing could be worthwhile.

was the new tire spin-balanced on a machine? maybe the inner spacer has been missing for some time, and when the wheel was installed on the balancer, the cone-shaped ends that are used to secure the wheel were tightened too much. this could have pushed a bearing in, if no spacer was there. grasping at straws here.

i assume the sprocket alignment is now off by the same amount?

[Allie]

Sharpy I appreciate your time and thought on this, I'm sure the answer is looming around the corner.

I also think it may be time to rebuild that caliper and do the SS brake line for the rear.

[Allie]

I cant be more helpful .. I just kept seeing the thread titled .. "Locating rear wheel" and figured I could come in and let someone know .. its on the back of the bike.

Happy Monday Everyone!

Hah that would be my first inclination. However while searching for similar issues to mine I grasped at the more esoteric definition of 'locating' and... Bingo

I notice though that it's under 'general/maintenance', I would have expected such an issue to be in 'tires/suspension/brakes'.

[Allie]

So looking at the pics. the spacers on he RHS havent been changed due to same oil/dirt on all the parts. so i presume all the spaces where left at home and none where taken with wheel to the shop. Before you use the buck shot. when the wheel is out next time can you measure how deep the bearing are from the outside ledge on the hub please. BOTH sides, and ill measure my spoked hub in my morning. almost bed time here. Ive been in wheel tyre changing shop half my life and this IS a simple job. murphys law. lets shoot murphy. Sadly my 1000 setup has diff discs and brake bracket.

I took my vernier scattergun out and took some measurements:

LH (sprocket side) bearings: 9.93mm
RH (rotor side) bearings: 10.15mm

Both measurements are from the outside perimeter of the bearing to the outside ledge of the hub.

More measurements:

Rotor thickness: 7.3mm
Caliper slot: 10.1mm (ish)

For the rotor to ride centered in the caliper slot there can only be about 1.4mm clearance on either side of it. It therefore seems that the carrier is missing approx. 1.4mm of distance from the bearing.

One more measurement:

Top Hat spacer width: 23.48mm

That spacer butts directly against the bearing, and the carrier butts directly against that spacer. I don't think there was a thin washer involved anywhere here. Therefore the carrier distance from the wheel is determined by two things:

1) The depth of recess of the RH bearing (10.15mm)
2) The width of the Top Hat spacer (23.48mm)

My conclusion is that the caliper carrier as mounted is now sitting 1.4mm too close to the rotor (1.4mm left of where it should be).
Correcting this can be accomplished two ways:

1) Decrease the bearing recess in the hub (move it 1.4mm to the right)
2) Increase the spacing between the bearing and the carrier (add a 1.4mm spacer to the Top Hat spacer)
2a) Cook the Top Hat spacer in a pan of grits until it grows 1.4mm)

Am I missing anything?

I cant be more helpful .. I just kept seeing the thread titled .. "Locating rear wheel" and figured I could come in and let someone know .. its on the back of the bike.

Happy Monday Everyone!

So looking at the pics. the spacers on he RHS havent been changed due to same oil/dirt on all the parts. so i presume all the spaces where left at home and none where taken with wheel to the shop. Before you use the buck shot. when the wheel is out next time can you measure how deep the bearing are from the outside ledge on the hub please. BOTH sides, and ill measure my spoked hub in my morning. almost bed time here. Ive been in wheel tyre changing shop half my life and this IS a simple job. murphys law. lets shoot murphy. Sadly my 1000 setup has diff discs and brake bracket.

either the caliper is mounted too far to the left, or the wheel/disc too far to the right.

the caliper bracket/spacer appears to be mounted correctly, so how can the disc be located 5mm +/- to the right? the wheel hub seems very close to the socket head cap screw that that holds the caliper together. doesn't even look like the wheel can spin. is the right-hand bearing spacer missing? crazy, i know.

i think the problem is that somehow the bearings are mounted incorrectly.

[Allie]

Stay tuned for photos of what the entire wheel assembly looks like after taking a couple rounds of 00 buck shot.

[Allie]

just took a gander at my 79 GS750L, and noted the plain spacer between the chain adjuster and caliper bracket is just 5mm wide. moving that spacer to the opposite side of the caliper bracket will cause the disc to be incorrectly centered in the caliper window by the same amount.

can take a pic of mine if you'd like.
bob p

You are correct Sir. I know this empirically .

Here are some photos of the apparatus in question:

An exploded view:


Number represent the order the parts go on the axle, with 0 being the axle itself. The taper on 4 faces the LH bearing inside the Rubber Baby Buggy Bumper (did I get that right?). The 'brim' of the top hat spacer (6) faces the RH bearing.

Rotor side assembled:



Shhhhhhprocket side assembled:



Some photos of what it looks like with the wheel installed and the carrier pressing the caliper against the rotor:

just took a gander at my 79 GS750L, and noted the plain spacer between the chain adjuster and caliper bracket is just 5mm wide. moving that spacer to the opposite side of the caliper bracket will cause the disc to be incorrectly centered in the caliper window by the same amount.

can take a pic of mine if you'd like.
bob p

bearings sit in the wheel on a ledge and there be no reason to remove bearings if you didnt ask for them to be replaced. Look/feel inside the bearing and should be a metal tube "floating" around inside between the bearings. Sometimes it a fraction loose, DONT worry as when it in and the axle gets tighten the slop goes away. FYI, the "Paddle" is called a Sprocket carrier(pics below) and the "rubber damper doohicky" are called the cush drive rubbers.


Sprocket Carriers.jpg

[GregT]

The only thing that could possibly be variable is the bearing position in the hub... Is there any way they could have messed that up at the shop? Pushing it into the hub too far would decrease the distance between the carrier and the rotor but I would not think it possible to do that to the bearing. Am I mistaken in my assumption that the rotor should ride more or less in the middle of the access window for the pads when the caliper is properly mounted?

The bearings go in against a shoulder in the hub so should be the same....Yes. the rotor should be in the middle of the caliper opening - but if I had a dollar for every time I've seen both pads on the same side of the rotor....