Front Brake Rotor to Hub Fit - Wrist Twisters
 
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post #1 of 7 Old 01-15-2015, 07:46 AM Thread Starter
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Front Brake Rotor to Hub Fit

How tight should the fit be between the center hole in the rotor and the boss on the wheel? It is critical for this to be snug or is a little clearance ok?

FYI, this is a F3 Wheel.

2004 919 Uranium

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post #2 of 7 Old 01-15-2015, 08:01 AM
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There is a slight clearance between the hub and rotor.

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post #3 of 7 Old 01-15-2015, 09:06 AM Thread Starter
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Quote:
Originally Posted by HeliMech View Post
There is a slight clearance between the hub and rotor.
Is this clearance enough to detect a "wiggle" when installing, before the bolts are tightened?

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post #4 of 7 Old 01-15-2015, 09:55 AM
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Quote:
Originally Posted by lococnc View Post
Is this clearance enough to detect a "wiggle" when installing, before the bolts are tightened?
There has to be a small amount of radial clearance between the rotor carrier and the register on the wheel to allow for thermal expansion of the carrier when the brakes are applied hard. This prevents warpage of the carrier which can cause the rotor to develop a runout, causing pulsation and pad knockback.

Rob

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On the other hand, if it has not been done never assume it is impossible to do it.
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post #5 of 7 Old 01-15-2015, 10:32 AM
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Quote:
Originally Posted by lococnc View Post

Is this clearance enough to detect a "wiggle" when installing, before the bolts are tightened?
Yes

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post #6 of 7 Old 01-15-2015, 02:53 PM
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Rob seems to always have the best answer.

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post #7 of 7 Old 01-15-2015, 02:58 PM Thread Starter
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My left side has the "loosness", despite there being powdercoat on the mounting surface. The Right is tighter, still goes right on with no effort but without the slop of the other side. I have Dremel wire-wheeled (took about 4 hours) and slowly removed the powdercoat from the flat surfaces (no metal was removed). But because the hub is loose I questioned the need to take off the powdercoat on the loose sides diameter, I think I will just leave it. However I may do so on the tight side.

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