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PostPosted: Wed Feb 01, 2017 7:03 pm 
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Joined: Fri Jul 23, 2004 8:24 pm
Posts: 2194
Location: Houston, Texas
I have a flat mount disc brake bike and two tubeless disc brake road wheelsets built on DT Swiss 240s center-lock, straight pull road disc brake hubs with IceTech RT-99 140mm center-lock rotors. I used wheelset A to align calipers and when swapping wheels between bikes, the rear brake rotor spacing is dead on, but the front rotor sits more inboard and contacts the brake pads.

With 6-bolt ISO style hubs, I would use dosc brake rotor shims to adjust the spacing, but there does not seem to be similar available for center-lock hubs. I had a thought to use a .5 mm cassette shim, but the inner diameter is insufficient to clear the center-lock splines. So seeing as many pros at the CX world championships were running thru-axle equipped bikes with center-lock rotors, how are these pro's mechanics dealing with such inconsistencies?

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PostPosted: Wed Feb 01, 2017 7:11 pm 
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Joined: Thu Sep 29, 2011 1:19 am
Posts: 132
Use some cutters to cut the spacer at one point and the you can get it past the splines. Thats what i did on mine.


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Posted: Wed Feb 01, 2017 7:11 pm 


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PostPosted: Wed Feb 01, 2017 7:55 pm 
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Joined: Tue Jan 28, 2014 6:52 pm
Posts: 1474
I recently read a Leonnard Zinn column on Velonews where he was talking about bending the rotor to shape using this park tool:

http://www.parktool.com/product/rotor-truing-fork-dt-2

http://www.velonews.com/2016/11/bikes-a ... nce_424791

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PostPosted: Wed Feb 01, 2017 8:49 pm 
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Joined: Fri May 25, 2007 6:43 pm
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I *think* problem solvers have centre lock shims listed. Or at least, they used to.


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PostPosted: Wed Feb 01, 2017 8:53 pm 
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Don't seem to have them listed. :/

Suppose you could cut a coke can up?


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PostPosted: Wed Feb 01, 2017 9:00 pm 
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Joined: Fri Feb 18, 2005 6:50 pm
Posts: 211
Location: Wilmington, DE
Diameter over the centerlock splines is 35.5mm and the rotor to hub mating surface is right around 40mm on my Icetech rotors. If you get it over the splines, a 40mm OD by 34mm ID shim would stay nice and concentric based on my hubs' dimensions

Since you are in the US, check out www.mcmaster.com, they sell a 45mm OD x 35mm ID shim which ought to work. They have 0.1mm to 1mm thick options.


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PostPosted: Wed Feb 01, 2017 10:41 pm 
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Posts: 2194
Location: Houston, Texas
joejack951 wrote:
check out http://www.mcmaster.com, they sell a 45mm OD x 35mm ID shim which ought to work. They have 0.1mm to 1mm thick options.

Thanks everyone. I think the option above offers the best solution for dealing with cl rotor spacing issues for multiple wheelsets.

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PostPosted: Thu Feb 02, 2017 1:42 am 
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Joined: Wed Apr 08, 2009 5:23 am
Posts: 572
Location: Olympic Nat'l Park, WA
Of all the non-standards in this industry, you'd think disc hub manufacturers could all agree on setting the rotor a specific precise distance (12mm or whatever it usually is) from the hub axle contact edge (= frame dropout surface).

Understand that this can't take into account every rotor's thickness, but this would go a long way toward being able to insert your other disc wheel without having to re-bolt the caliper every dang time.


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Posted: Thu Feb 02, 2017 1:42 am 


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