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 Post subject: Re: Hope Hub bearings.
PostPosted: Mon Oct 16, 2017 12:40 pm 
Retro Guru
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Joined: Thu May 17, 2012 11:04 am
Posts: 552
Location: manchester
what ever you do, do not buy C3 class bearings as these are made with more clearance for when they get hot under load at high speeds 20K+ (app 2,400kph on your bike) likewise ceramic bearings are designed for electrical isolation reasons and nothing else, they are not magic beans but they are expensive beans :)

 Post subject: Re: Hope Hub bearings.
PostPosted: Mon Oct 16, 2017 5:00 pm 
Retro Guru

Joined: Thu Aug 27, 2015 7:26 pm
Posts: 398
Location: French Alps
And don't f**k about buying bearing drifts.

If you only have to worry about the outer or inner race, take a slitting disc on an angle grinder, and cut a slit radially straight through the side of one of your old bearings. This should allow you to lose the balls, and recover the two races, which, now they have a bit cut out of 'em, can be used to drift in your new bearing but won't stick in the hub / on the axle.

If you have both hub and axle to worry about (which you probably will for the second bearing), leave an old bearing intact, but flap disc the outer race to reduce the diameter by 1/10mm or so, and do something similar to the inner race (die grinder, drill with a dowel and a bit of sandpaper on it, rat tail file, etc). You can now use your newly "clearanced" bearing to drift in the new one, again, without worrying about it jamming in place. You do need to be a bit more careful twatting it with the hammer, you need to hit both races flat.

When putting your new bearings in, put them in place and tappity tappity tap around the outside until they start to go in straight. Then drift em in. Saves knackering the hub.

 Post subject: Re: Hope Hub bearings.
PostPosted: Tue Oct 17, 2017 8:38 am 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 17842
Location: Yorkshire, England
other than having to buy an angle grinder and flappy thing... and you still have to worry about hitting it correctly

The drifts are only flat ended cylinders, nothing fancy.
My hub support end is a lightly padded socket, fits nicely around the shell.
Find a thick washer the right size and use that as the edge to your socket set etc. if your sockets fit of course

or whatever else you can dream up.
Bit of wood would do using a circular saw drill bit etc.

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