Cartridge bearings affected by QR tension?

[PLuKE]

I am struggling to find my answer to this question, so hoping you knowledge people can shed some light?

With non adjustable cartridge bearing, is the preload not affected by the tension of the QR? So if you was to do tighten the QR normal vs firm, this wouldn't change the set bearing preload?

Many thanks
Luke

[Rick]

It SHOULDN'T ; but it really depends on the design of the specific hub.
Most are designed such that as the QR force increases it is all borne by either the outer or inner bearing race without increasing load on the bearings. But I have heard of some that aren't designed properly.

[goodboyr]

Many hubs are designed for the preload to be adjusted while the wheel is already clamped in. Mavic, campy, zipp, to name a few.

[PLuKE]

I was mainly talking about 77/177 hub design. The new hub design is non adjustable reload. I was just curious.

Thanks

[goodboyr]

I expect zipp has set up tolerances to have an expected preload when clamped. I disagree with previous poster in that hub bearings are affected by clamping force and thus preload setting must take this into account.

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[TheDarkInstall]

It depends entirely on the design of the hub, and in particular the bearing arrangement in relation to the axle, and how the axle ends are designed.

[goodboyr]

Can you give an example of one?

[pdlpsher1]

I don't know how it actually works but the latest Shimano hubs are designed to have the QR forces act on the axle rather than the bearings. I did recently service my DA hubs and can confirm that the QR has no or very little effect on bearing preload.

[PLuKE]

I am aware that, cup and cone style rely on QR tension to get the correct preload.

I was really talking about cartridge style and non adjust preload style hubs.

Thanks anyways guys!!

Luke

[TheDarkInstall]

Can you give an example of one?

An example of one what? A hub where QR force doesn't affect bearing preload?

Extralite CyberRear SP.


The arrangement has the locating bearing in the outside end of the freebody, then 3 more bearings spaced out across the freebody and hub shell. The opposite non-locating bearing has a preload adjuster sitting against it. The axle end have nothing at all to do with the preload on the bearings, and you can clamp the hub in as hard as you like (within reason, of course!) and the bearings won't be affected, as all you are doing is putting force down each end of the axle.

[TheDarkInstall]

I am aware that, cup and cone style rely on QR tension to get the correct preload.

Incorrect.

[Marin]

It used to be that way with flexible axles though.

[goodboyr]

Can you give an example of one?

An example of one what? A hub where QR force doesn't affect bearing preload?

Extralite CyberRear SP.


The arrangement has the locating bearing in the outside end of the freebody, then 3 more bearings spaced out across the freebody and hub shell. The opposite non-locating bearing has a preload adjuster sitting against it. The axle end have nothing at all to do with the preload on the bearings, and you can clamp the hub in as hard as you like (within reason, of course!) and the bearings won't be affected, as all you are doing is putting force down each end of the axle.

The manual for these hubs says that to adjust preload properly, the hub must first be properly clamped with appropriate qr force in drop outs.

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[uncle-gee]

dt240s -> cartridge bearings no preload and QR tension does not affect the bearings

campagnolo hubs (for example neutron ultra wheels) -> cup and cone bearings preload and QR tension does not affect the bearings

mavic ksyrium -> cartridge bearings preload and QR tension affects the bearings

[goodboyr]

dt240 do not have adjustable preload, but similar to older zipp hubs, rely on tolerances and a certain amount of qr tension to get preload right, so I disagree that qr tension has no effect.