Increasing rotor-to-fork leg distance

Jdub

Jdub

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I was concerned about the paper-thin distance between my fork leg and the rotor. I re-checked the hub and spacers, especially the 19.5mm distance for the disc-side spacer item 06.2448 (same item for both Mk3 and prior models) - all good. So I decided to purchase a shim to place the fork further outboard and open up the distance. It's a pretty marginal fix and I'd like to ask the group first if a paper-thin but non-interference (when cold) distance is acceptable, and second if there is a better way to open up that distance since the rotor fits very nicely between the pads in the caliper and any change will move the rotor inboard and the caliper outboard. Thanks for your comments in advance!

Increasing rotor-to-fork leg distance
 
Jdub said:
I was concerned about the paper-thin distance between my fork leg and the rotor. I re-checked the hub and spacers, especially the 19.5mm distance for the disc-side spacer item 06.2448 (same item for both Mk3 and prior models) - all good. So I decided to purchase a shim to place the fork further outboard and open up the distance. It's a pretty marginal fix and I'd like to ask the group first if a paper-thin but non-interference (when cold) distance is acceptable, and second if there is a better way to open up that distance since the rotor fits very nicely between the pads in the caliper and any change will move the rotor inboard and the caliper outboard. Thanks for your comments in advance!

View attachment 111702
Click to expand...
How close was it exactly?
Coz clearance is clearance
 
Maybe one mm plus a hair. However, since I posted I ran a fingernail to the top and there is a very small amount of machining flash on the rotor edge I'll remove and recheck.
 
You should not be able to add a spacer! Seems like you're fixing a symptom, not a problem. Maybe just the picture angle, but the first picture looks like the rotor is centered in the caliper.

While 06.2448 is the same the other side is different between MK3 and pre-MK3. Is it a stock wheel, fork set, and caliper?
 
Thanks to all who replied. I should simply have asked if any distance in clearance is enough. If any of us had ever experienced any flex or similar that necessitates a minimum of clearance I would want to know what that distance is.

I'll pull my spacer and call it good. To close this thread the details of my setup are that I am using a MK3 hub reversed with the rotor on the right side and a standard Norton rotor sent to Ian at Fluidsix for drilling. A similar example can be found here: https://www.ebay.com/itm/235076985527. Again, thanks for your replies!
 
The conversation would be more useful if you measured the actual clearance and asked it that quantum is adequate.
A set of feeler gauges would probably do the job, from what you described.
The final answer will probably still be that clearance is clearance.......
 
1mm clearance is plenty, as long as you have not got bad wheel bearings. Measure it to ensure you have 1mm. Don't just judge it, by looking at it. Also rotate the wheel while checking the clearance. Discs are not usually distorted, but there might be an error in the face of the hub where the disc mounts. If the wheel spins and the clearance of the disc remains constant, you should not have a problem.
 
If you do find you have a bit of wobble when rotating Trudisc can Blanchard grind the rotor and they will true the face of the mount where it meets the hub .
 
ludwig said:
The closer, the better. =Less stress on the slider.
If you are really anal about it, you could file a flat on the slider for an extra 0.5 mm, or so.
Click to expand...
I seem to have a non-standard rotor. It is about 0.058" deeper from mounting surface to outside contact area surface than other Commando rotors I have measured. This leaves the rotor contacting the outside pad and very little slider clearance (0.015").
 
NickZ said:
I seem to have a non-standard rotor. It is about 0.058" deeper from mounting surface to outside contact area surface than other Commando rotors I have measured. This leaves the rotor contacting the outside pad and very little slider clearance (0.015").
Click to expand...
Not saying you're wrong just wondering how you are measuring. I recently had one bike with the bearings not homed and another with the wrong spacers - both causing alignment errors. Also a warped disk can confuse measuring.
 
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