Rennlist

Allowed deviation/runoff on wheel hub

Add to repair workspace

New repair projectOpen repair workspace

Original source

4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHAllowed deviation/runoff on wheel hub

Leading reported evidence

Use some washers and wheel bolts, or other bolts

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Use some washers and wheel bolts, or other bolts to torque the rotor down evenly to the hub.
Original post Read captured discussion
Allowed deviation/runoff on wheel hub

Read full discussion summary

Leading evidence: 'Use some washers and wheel bolts, or other bolts' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use some washers and wheel bolts, or other bolts' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 4 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Use some washers and wheel bolts, or other bolts

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Use some washers and wheel bolts, or other bolts to torque the rotor down evenly to the hub.
Original post Read captured discussion
Allowed deviation/runoff on wheel hub

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T090147Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hello, I previously posted a topic on vibrations under braking which mysteriously appear after about 5.000km from mounting new brake rotors, here: https://rennlist.com/forums/996-forum/1321693-vibrations-under-braking.html?ispreloading=1 In an attempt to get to the bottom of these issues we will be measuring the wheel hub deviation or runoff. The indy shop which will perform the measurement suggested that the deviation should be 0-0,01mm but they weren�t sure. Before going ahead I ask the kind and knowledgable people of this forum: What is the allowed deviation or runoff on the wheel hub of a carrera 996? Information on the radius of measurement is also very much appreciated.

POST 2Original post

Porsche specs the maximum lateral runout for the hub at .04mm (.00157" or 1.5 thousandths). Porsche worse case run-out for total rotating mass (hub+rotor=.002" at the hub which equates to .0045" @ perimeter, 18" alloy wheel =.0275) exclusive of the tire is calculated to be .032". Hope this helps.

POST 3 / ORIGINAL POSTEROriginal post

Thank you, just to confirm on my image below... At the yellow dot (measured on the hub without the rotor) the maximum permitted runoff is 0.04mm or 0 .00157" and at the red dot (on the mounted rotor) it's 0.1mm or 0.0045" ?

POST 4Original post

Make things simpler for yourself. Total runout of the rotor/hub after wheel is torqued down is what your after. The hub runout can't help but show up in the rotor runout measurement. Use some washers and wheel bolts, or other bolts to torque the rotor down evenly to the hub. Then measure runout at an area that the brake pad rides on(slightly in from the outer edge). That will be the total runout of the disc/hub assembly... Anything over .004" will give you some high speed vibes under braking. Over .006" will cause shudders/vibration even at lower speed braking. jmo

This is a source reference. Confirm exact model applicability in the original material.