Seeley - Norvil Front Hub Dual disc spoke-caliper clearance

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I have a similar setup, GP35, Minnovation yolks and AP callipers.

My hub is from RGM and is the one piece one not the three piece. those disks are RGM but I did have a Norvil type on there at one point.

If I remember right, I had to machine the hub and the disc mounting surface to get it to fit, I don't have a problem with the callipers touching the spokes so the RGM hub must have a narrower spoke mount. I will go and measure it for you.


Seeley - Norvil Front Hub Dual disc spoke-caliper clearance
 
storm42 said:
I have a similar setup, GP35, Minnovation yolks and AP callipers.

My hub is from RGM and is the one piece one not the three piece. those disks are RGM but I did have a Norvil type on there at one point.

If I remember right, I had to machine the hub and the disc mounting surface to get it to fit, I don't have a problem with the callipers touching the spokes so the RGM hub must have a narrower spoke mount. I will go and measure it for you.


View attachment 15589
Click to expand...
Hey this is a great bike, i ve read your write up. In fact i was looking at your pictures recently and wondering. I have a good mechanic who can depress and narrow my hub for about 2-3 mm each side. The question is how narrow an a hub can be (meaning the distance betweens opposite spokes) and still work . So if you can measure your hub i d be grateful.
 
My own lathe is from the 1970's, narrowing a hub by machining the 2 disc mounting surfaces is fraught with setup issues, 3 jaw chucks on their own will not hack it. It will need a special setup to ensure the 2 surfaces remain true to each other.

I use this setup for my machining of critical surfaces where they need to stay parallel.



You can see my pucks on my chuck in this photo.

Seeley - Norvil Front Hub Dual disc spoke-caliper clearance
 
storm42 said:
I have a similar setup, GP35, Minnovation yolks and AP callipers.

My hub is from RGM and is the one piece one not the three piece. those disks are RGM but I did have a Norvil type on there at one point.

If I remember right, I had to machine the hub and the disc mounting surface to get it to fit, I don't have a problem with the callipers touching the spokes so the RGM hub must have a narrower spoke mount. I will go and measure it for you.


View attachment 15589
Click to expand...

How wide are your yokes Ralph ?
 
springer said:
Hey this is a great bike, i ve read your write up. In fact i was looking at your pictures recently and wondering. I have a good mechanic who can depress and narrow my hub for about 2-3 mm each side. The question is how narrow an a hub can be (meaning the distance betweens opposite spokes) and still work . So if you can measure your hub i d be grateful.
Click to expand...

Got to nip into work just now, let me know if you need anything else and I will do it when I get back.

Seeley - Norvil Front Hub Dual disc spoke-caliper clearance
 
kommando said:
My own lathe is from the 1970's, narrowing a hub by machining the 2 disc mounting surfaces is fraught with setup issues, 3 jaw chucks on their own will not hack it. It will need a special setup to ensure the 2 surfaces remain true to each other.

I use this setup for my machining of critical surfaces where they need to stay parallel.



You can see my pucks on my chuck in this photo.

Seeley - Norvil Front Hub Dual disc spoke-caliper clearance
Click to expand...

I love Joe Pieczynski's video's they are brilliant, simple and logical at the same time.
 
springer said:
I myself thought that the problem is the hub but considering i want to use my norvil discs and carriers and my my Lockheed calipers, The hub is not a problem. After measurements , it is comparable to the CB 750 hub and considering that i would have to make carriers that would fit the Norvil disc (for the cb 750 hub) the result would be the same. The main problem is that the Ceriani GP35 lower slider is 52mm in diameter and that is that limits most other clearances. Anybody could measure me the Norton Fork slider?
It seems that i have to cut 1-2-3 mm from each component in order to fit what i have...
Click to expand...

My calliper mounts are in three pieces. At the top, there is a small triangular plate which comes off the mudguard mount, then a 10mm spacer which fits behind the main plate which carries the calliper. Because I have no bottom mount on the slider, I have small shaped piece which allows me to fasten the bottom of the main plate to the axle. The 10mm spacer moves the main plate out, so the calliper is clear of the spokes. I hold everything together with bullet-head Unbrakos. If you use them, paint them, do not electroplate them. If they let go, you will have nothing in front to stop you.
 
probably no useful info here, pictured are the twin disc hubs for 7-3/8" forks with all inner spokes.
I havent done these wheels in a long time coz I wasnt really happy with my fork sliders. I'm pretty sure they
were a pain to lace up. These hubs are 4-1/16" (103mm) wide at the disc faces, They have the Norton 5 bolt
disc mounting pattern. My discs which are the same as I use on my single disc kits dont have as much offset
as the Norton discs. for memory the discs were only about 2 or 3mm from the inside of the slider.
Seeley - Norvil Front Hub Dual disc spoke-caliper clearance
 
madass140 said:
probably no useful info here, pictured are the twin disc hubs for 7-3/8" forks with all inner spokes.
I havent done these wheels in a long time coz I wasnt really happy with my fork sliders. I'm pretty sure they
were a pain to lace up. These hubs are 4-1/16" (103mm) wide at the disc faces, They have the Norton 5 bolt
disc mounting pattern. My discs which are the same as I use on my single disc kits dont have as much offset
as the Norton discs. for memory the discs were only about 2 or 3mm from the inside of the slider.View attachment 15611
Click to expand...
Very useful. were these spokes ordered specially for inward lacing? I think in order to do that the spokes must have different lengths at the bent part near the spoke head and maybe different bend angle. How did the wheel perform? This is i guess the equivalent of effectively narrowing the hub by almost the amount of the thickness of the piece the spokes attach. Are the spokes well laced or do they bend when they touch each other at the base?
 
Last edited:
yes I had spokes made for this which have 2 different lengths at the short end so one spoke is not bending over the other.
 
madass140 said:
yes I had spokes made for this which have 2 different lengths at the short end so one spoke is not bending over the other.
Click to expand...
Fantastic! great info everybody. I think t can be done then in one of the ways (or a little bit of all the above..) I will post my progress during the next week. Also i will post about the bike as i continue it s build.
 
I don't like fitting Japanese bits to British, Italian or American motorcycles. But anyone would be hard-pressed to identify the Suzuki discs and Honda hub on the front of my Seeley, as being Japanese. Very cheap at the motorcycle wreckers. My callipers are Lockheed AP and the master cylinder is designed to operate only one, but works two. The brake is one finger operation and stops the bike like hitting a wall. For racing, it needs to be like that. I use the other fingers to grip a quick-action throttle, so everything is instantaneous. The only thing which did not work, was when I fitted carbon racing pads to the callipers. They never got hot enough when I rode on the shorter circuits. Felt like using a single chromed disc - no grip.
 
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