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RD Mounting Bolt - Torque setting?

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RD Mounting Bolt - Torque setting?

Old 05-08-21, 09:20 AM
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Sy Reene
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RD Mounting Bolt - Torque setting?

Interestingly, Park tool lists 8-10Nm for Shimano, but 15Nm for Campagnolo. I assume same size bolts, so why the large variance?
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Old 05-08-21, 09:34 AM
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A followup question, related to RD Alignment tool (ParkTool DAG3).. Diagram below of where to test on the wheel, but the instructions don't indicate to rotate the wheel so that the same part of the rim is tested for each position, however, the diagram itself is showing the tube valve always appearing at A, B, C, locations, etc. meaning that you should rotate the wheel when testing? Probably shouldn't matter, just curious.

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Old 05-08-21, 10:30 AM
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I have never torqued a RD attach bolt. There are some bolts, threaded into steel or aluminum, I just don’t torque; RD, FD, seat bolt, quill stem bolt, cage bolts, and probably more.

But I were going to take a wild guess, I’d say a 5mm bolt would be 8-10nm. However the threaded portion of a RD attach bolt is a larger diameter than a 5mm threaded bolt, thus a higher torque range.

What is odd is the bolt material is probably very similar, but the dropout material can vary. One could say 10nm for aluminum and 15nm for steel, but torque should be the amount to holding the RD and not what it is attached to.

As far as rotating the wheel, my understanding is yes, you measure at the same point on the rim, in 4 directions. This takes any wheel trueness issues out of the equation.

John

Last edited by 70sSanO; 05-08-21 at 10:36 AM.
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