Tight 919 rear wheel bearings: As designed? - Wrist Twisters
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post #1 of 4 Old 05-11-2013, 09:13 AM Thread Starter
Join Date: Feb 2013
Location: London
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Tight 919 rear wheel bearings: As designed?

I've just replaced the rear tyre on my 10K mile 900 (919), and was intrigued by the feel of my rear wheel bearings when the wheel is off the bike: they feel very tight, and can only be turned by hand with difficulty. However, they aren't 'graunchy' or rough; just really stiff. I even popped the seal off the sprocket side bearing, and there was plenty of reasonably clean grease.
The spacer is tight between the inner races, so I'm wondering if this is normal, and that when properly torqued up, the spacer will compress enough to bring the bearing back into tolerance. I wouldn't like to go any distance with them that tight if not. I haven't come across this on any of my previous bikes, but maybe Honda started reducing the spacer wall thickness to reduce unsprung weight!
Anyone remember their rear wheel bearings being tight? Incidentally, the cush drive bearing is fine, and when assembled the wheel spins freely and there is certainly no play or noise.

Hornet 900 (919) 2003. Leo Vince SBK cans.
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post #2 of 4 Old 05-11-2013, 09:44 AM
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My guess is that an outer race is a bit snug in its bore and hasn't floated to centre itself about the inner race, noting the inner race is located by the axial stack of the spacers, inner races and centre distance sleeve.

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post #3 of 4 Old 05-11-2013, 10:38 AM Thread Starter
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Thanks for the reply mcromo (I thought you'd be on the case on this one), this was my concern which suggests that the wheel hub bore is slightly too deep, and maybe I need to shim out one of the bearings outer races to bring it within tolerance, or at least not allow the bearing to seat fully, which seems a bit hit and miss!
I was thinking I might try to measure the torque required to move the rear wheel (without chain or pads) and see if there is a reduction as I torque up the rear, if necessary above the specified value.

Hornet 900 (919) 2003. Leo Vince SBK cans.
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post #4 of 4 Old 05-12-2013, 04:49 AM
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This is normal if the wheel is off the bike and the long spacer inside the wheel between the bearings is not center. Put the wheel on its axle and spin it. It's prob fine

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