Bearing Cone Difficulty

[S.Giles]

Hello,

I've just discovered a damaged front bearing cone on my aged Carrera Kraken mountain bike. I'm having difficulty finding the correct replacement, since the hub does not have any manufacturer's markings (but does seem quite nice quality). The axle is 10x108mm (is this unusual?), and the cone seems of slightly larger diameter than normal.

I would be very grateful if anyone could point me in the right direction for a replacement part (I already have three different axles purchased in error).

It has been suggested that the hub may need replacing (with a Shimano, for instance), but I'd rather repair if possible.

Thankyou,

Steve

 

[I like Skol]

Damaged how? If it is pitting then you could possibly get away running it for a good while longer before it becomes a problem but if it is totally mashed (technical term) then replacement is the only option. Can you post a picture of the damaged part? If it is mild pitting just fit new bearings, fresh grease and don't put any preload on the bearings when rebuilding, just tighten the cones enough to just remove play or even leave a tiny bit of play as this should disappear when the quick releases are done up tight.

What year is the bike, you might be able to google the spec for the bike if you know the right year and exact model. If you can find the make and model of the hub it will be a lot easier to find if the part is available.

I have a pitted cone in the front hub of my road bike but by doing the above it has now run fine for over 1000 miles and is still silky smooth.

 

[RecordAceFromNew]

If just the cone is pitted get it and the whole set of ball bearings changed as soon as you can or the cup can also become pitted quickly. Once the cup is pitted there is usually no cure and the hub will have to be replaced.

What cone to replace it with is dependent on a) bearing surface profile, b) axle size and thread standard, and c) dustcap and seal size and position maintenance whether integral to the cone or not. So it can be dependent on your luck for 3rd party supplies. Have you tried Halfords?

 

[S.Giles]

Thanks for the replies.

Yes, it's pitted, not "totally mashed", and only one side is affected. I've replaced the ball bearings and the wheel is functioning well. Its more of a psychological thing, and not wanting to risk exacerbating the problem. There is a tiny bit of damage to the cup, but as stated, that's done and can't be corrected. I'll run the wheel as is and hope for the best, I think, replacing the hub when necessary.

Yes, Halfords may be a source of information. I'll talk to someone at the Hull branch (where I've received excellent help in the past, I have to say, [unlike the Doncaster store!]).

It's similar to this http://www.ebay.co.uk/itm/Carrera-k...1151756565?pt=UK_Bikes_GL&hash=item2c81885515 , but all blue in colour, by the way. Probably fairly old, I would think. Disc brake on front only.

Photo's are beyond my capability at the moment, I'm afraid!

One final thought. Some friends of mine have a machine shop. Do you know if it would be possible to 'skim' the damaged cone down to a smooth surface on a lathe or similar? I guess I should ask them.

Thankyou again for your time.

Steve

 

[numbnuts]

Have a look here cone chart
http://wheelsmfg.com/tech/PDF/wheels_cone_chart.pdf
and here
http://www.sjscycles.co.uk/page/find/?name=wheel cones&page=1

 

[S.Giles]

Thankyou for the links. I'm sure one of the Shimano 10mm cones could be made to work. Will have to make myself take the hub apart and measure the damaged cone.

Steve

 

[SquareDaff]

The Wakefield store has an actual cyclist with good mechanical knowledge too. He was young though so may have gone somewhere else. I'm in there this weekend picking up an N+1 so will check. It would be closer for you than Hull.