Hub bearing preload

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fossala
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Joined: 21 May 2013, 8:29am

Hub bearing preload

Postby fossala » 7 Feb 2019, 7:59am

I'm going to be stripping my Dura-ace (track) 7710 hubs this afternoon to put some fresh grease in the bearings (NOS). On qr axles I've always allowed a little play that get's taken up when clamped down in the dropouts with the qr. I'm guessing this isn't the case with a solid axle hub?

Airsporter1st
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Re: Hub bearing preload

Postby Airsporter1st » 7 Feb 2019, 8:35am

I would say not. The QR applies a 'squeezing' force axially across the hub which does not occur with a properly installed solid hub.

IMHO, of course - no doubt someone else will drop in and point out my errors, shortly.

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fossala
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Re: Hub bearing preload

Postby fossala » 7 Feb 2019, 9:25am

Airsporter1st wrote:I would say not. The QR applies a 'squeezing' force axially across the hub which does not occur with a properly installed solid hub.

IMHO, of course - no doubt someone else will drop in and point out my errors, shortly.

That was my reasoning (guessing).

Brucey
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Re: Hub bearing preload

Postby Brucey » 7 Feb 2019, 10:06am

the only think you need to look out for is that the load on the cones from the locknuts is not quite the same as the load on the cones once the track nuts are tight. This can cause the cones to settle differently on the axle threads when you tighten the track nuts.

However this effect is normally very slight indeed; if you adjust a hub in the frame so that there is no play in at the rim, you would be hard pushed to say for sure that there was play in the hub once the track nuts are less tight.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

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fossala
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Re: Hub bearing preload

Postby fossala » 7 Feb 2019, 10:47am

Brucey wrote:the only think you need to look out for is that the load on the cones from the locknuts is not quite the same as the load on the cones once the track nuts are tight. This can cause the cones to settle differently on the axle threads when you tighten the track nuts.

However this effect is normally very slight indeed; if you adjust a hub in the frame so that there is no play in at the rim, you would be hard pushed to say for sure that there was play in the hub once the track nuts are less tight.

cheers

I've just finished adjusting them out the frame so there is no wobble feel at the axle but I can see a little tiny bit of grease move around the seal. I'll see if there is any play once in the dropouts.