Problems installing front brake upgrade

I’m having problems upgrading my 1971 roadster from front drum brakes to stock disc brakes.
I replaced the right fork slider with a 1973 disc brake slider. Everything fits great. The only
Problem is the wheel is off center to the left. Also the front fender mounting bracket on the left
Side is too tight and won’t allow the wheel to turn without rubbing against the mounting bracket.
The front tire is a new Avon 100/90-19 road rider. I have a spacer on the right side dust cap allowing for the disc brake caliper to fit. The left side wheel dust cap has no spacer. I even loosened the left side spokes one turn and tightened the right side spokes one turn each. The spokes look straight up and down on the right side but that didn’t move the wheel rim enough to center it to the forks. Could the fork yokes be different on a 1970-71 vs. a 1973-75? Has anyone else had this problem?

nortonisthebest said:

Could the fork yokes be different on a 1970-71 vs. a 1973-75? Has anyone else had this problem?

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There's no difference in fork width, so that isn't the problem.

I think you should have a look at a manual for '73 front wheel and make sure you got the proper spacers in correct location .... also you could search this site for front wheel spoke offset .... with the disc front wheel I think the wheel is laced to accommodate the disc ... I'll bet you get better help here shortly too ... patience is a good thing
Craig

I really feel your pain. When I recently installed my newly totally rebuilt front wheel on my '72, everything was too far to the right. I finally figured out that the problem was that I installed the new wheel bearings in the wrong order. The single row bearing should have gone in and bottomed out first. The factory manual gives the correct sequence, just doesn't explain why. I re-did the bearings properly, then had to true the rim back to being centered between the fork tubes. Eventually I got everything lined up with some very minor shimming to the r/h axle spacer and caliper mounting. Maybe a similar wheel assembly problem might be the case with yours, but in the opposite direction??
Bill

How can the wheel be so off center? If I used a shorter spacer the disc would rub against the aluminum fork tube. I can't move the rim over by adjusting the spokes any further. I prefer not to go back to a drum brake which fit ok. I must be missing something??

nortonisthebest said:

How can the wheel be so off center? If I used a shorter spacer the disc would rub against the aluminum fork tube. I can't move the rim over by adjusting the spokes any further. I prefer not to go back to a drum brake which fit ok. I must be missing something??

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Just to clarify, you're saying that the wheel is too far offset to the left (primary side), but the brake disc is aligned with the caliper on the right? (timing side)

What is the history of the new disc wheel and hub assembly? Did you build it up from scratch? Photos would be helpful.

Can I send pictures to your email?

nortonisthebest said:

I can't move the rim over by adjusting the spokes any further.

Click to expand...

If all are standard disc wheel parts and the disc is in the centre of the caliper slot when the spindle/axle nut is fully tightened then the problem is almost certainly caused by incorrect rim offset.

You'd be much better off posting photos to the forum for all the real experts to study. I'm still on the very steep part of the Norton learning curve, I only commented because I recently had a similar problem and was able to work my way thru it. I think L.A.B.'s last post pretty much says it all.
Bill

As Lab correctly posted

if the disc rotor aligns with the caliper all the wheel bearings / spacers should be correct
check who ever built the wheel used the correct spokes if the spokes are to short you will not be able to move the rim across far enough to get the offset right

I don't believe I can adjust the spokes anymore to try and move it over to the right. I have run out of thirds on a few of the right side spoke nipples. The wheel is definitely offset to the right and the spokes on the right side are about 3/16" away from the caliper. The caliper opening over the disc is very close to center, so my spacer looks to be correct on the right side. As I mentioned earlier that the left side only has the flat dust cap with no spacer. The axel on the left side shows about a 1/4" gap between the aluminum slider and dust cap. The only thing it could be is the rim must not be over enough to the right. But how can I correct it enough to clear the caliper from hitting the spokes? I know the disc brake assembly is stock and fit perfectly on a 1973 Hi Rider that I had sold. I was able to buy back the stock disc brake setup because the gentleman I sold the HI Rider to went back to the drum brake. Why did the disc brake work on the 1973 Hi Rider and not on my 1971 roadster????

Note: I signed up using photo bucket. I then downloaded 3 photo's. I followed the instructions on Access Norton on how to down load pictures on Access Norton but when I clicked on the YouTube video it was blurry and had no sound? I would love to show these pictures but don't know how???

nortonisthebest said:

Note: I signed up using photo bucket. I then downloaded 3 photo's. I followed the instructions on Access Norton on how to down load pictures on Access Norton but when I clicked on the YouTube video it was blurry and had no sound? I would love to show these pictures but don't know how???

Click to expand...

Once you have uploaded your photos to photobucket you then have to 'copy' and 'paste' the IMG code of each image into your forum message.

If you get it right each image should show in your message when you click 'Preview'.

http://s1360.photobucket.com/user/ppcds1/library/
<iframe width="480" height="360" src="http://s1360.photobucket.com/user/ppcds1/embed/slideshow/"></iframe>
http://s1360.photobucket.com/user/ppcds ... e.jpg.html
http://s1360.photobucket.com/user/ppcds ... 4.jpg.html

Close, it isn't the IMG code but it got us to the photos.

Your photos:

I can't see any problem with the hub assembly.

With a straightedge on the outer face of the disc, what is the distance between the straight-edge and the rim?

The standard rim should be WM2-19 'MC275".

1 1/2" from outside face of the disc to side of rim.

nortonisthebest said:

1 1/2" from outside face of the disc to side of rim.

Click to expand...

I would say that is about 3/16" - 1/4" more than it should be.

The rim is a Dunlop WM2-19, MC275.

Are you saying it should be around 1 1/4" ? If so what can I do to correct it? I already loosened to spokes on the left side one turn and tightened the right side spokes one turn but a few of the spokes ran out of thirds. The spokes are fatter on this rim then the back rim.