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Old 06-07-2019, 15:13   #1
dreMR
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Wheel/brakes rubbing



Any ideas what could be causing this? There is plenty of clearance 6mm by looking at it. Wheel and caliper doesnít catch when spinning wheel by hand.


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Old 06-07-2019, 15:17   #2
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I originally thought a stone had got caught between caliper and wheel as it was only part way around wheel. I did a track day at castle Combe yesterday and now it’s all the way around although worse in one spot.

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Old 07-07-2019, 09:25   #3
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I originally thought a stone had got caught between caliper and wheel as it was only part way around wheel. I did a track day at castle Combe yesterday and now itís all the way round although worse in one spot.


some sort of heat expansion ?


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Old 07-07-2019, 11:19   #4
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Iím not sure itís only on the passenger side drivers side is fine? Is there something that could move under hard braking?
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Old 07-07-2019, 20:49   #5
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What size alcons you got? and what wheels size?
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Old 08-07-2019, 06:25   #6
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343mm Alcons and 17Ē rays ce28n
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Old 08-07-2019, 07:44   #7
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What's the static (cold) clearance between caliper and rim? Are there are any corresponding rubbing marks on the calipers?

Using a 343mm disc arrangement with 17" wheels sounds like a recipe for trouble imo.
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Old 08-07-2019, 09:28   #8
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About 6-8mm but itís difficult to get a tape measure in there. Maybe it is from heat expansion looking a the calliper but itís a lot for it to expand. Itís booked in to c1r for them to have a look end of the week.




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Old 08-07-2019, 11:36   #9
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First thing i thought was a stone or other road/track debris in there which is usual cause things like this, looks to be plenty of cold clearance and 2-3mm is generally more than enough of an air gap to allow for expansion and would certainly never see it growing 6mm when hot! another thing to check the mounting bolts are all tight and not come loose with either bolt coming out or caliper moving out because of it.

I wouldnt want to drive it much or far until investigated further.
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Old 08-07-2019, 12:17   #10
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First thing i thought was a stone or other road/track debris in there which is usual cause things like this, looks to be plenty of cold clearance and 2-3mm is generally more than enough of an air gap to allow for expansion and would certainly never see it growing 6mm when hot! another thing to check the mounting bolts are all tight and not come loose with either bolt coming out or caliper moving out because of it.

I wouldnt want to drive it much or far until investigated further.
Thanks for the reply Iíll have a look at the bolts etc when I get home then itís booked in to C1R on Thursday for further investigation.
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Old 13-07-2019, 14:24   #11
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did u check run-out of the hub flange before attaching brake disc ? just a thought


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Old 14-07-2019, 17:18   #12
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I havenít got spigot rings fitted and Iím not sure if the wheels need them. Iím thinking the wheel might of been moving under very hard braking itís all being checked now.
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Old 15-07-2019, 07:02   #13
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I havenít got spigot rings fitted and Iím not sure if the wheels need them. Iím thinking the wheel might of been moving under very hard braking itís all being checked now.
Even if spigot rings should be fitted I think it's very unlikely that any movement, of itself, would be enough to cause the rubbing.


Has the wheel been checked for trueness as it rotates? All I can think is that it's a case of expansion/mechanical movement/rotational out of trueness that combine and peak during heavy braking.
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Old 15-07-2019, 07:53   #14
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The wheels were checked when they were refurbished and he said they were all round and no wobble. Hopefully I donít have to change wheels as I chose a small light wheel for best performance. And they look
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Old 27-07-2019, 10:58   #15
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Had exactly the same issue at Snetterton the other day when it was 38.1 deg. They had been OK at Cadwell earlier in the month.

343mm discs on 17" Evo 8 Enkies. The clearance was 3mm worst case static/cold. Its not runout as marks on wheel are even all around.

I saw an old thread suggesting taking a little off the brackets to add a bit more internal clearance - I measure up again and probably try that to give bit more clearance.
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