I just started to service the bearings on my Carrera Subway 1. I removed the cone and found that the outside ring separates from the main cone. You can see this in the pictures.

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What is this ring? And can they be purchased?

2 Answers 2


The outside ring is a bearing seal. Looking at your picture, it may be damaged. You can try to bend it back to its original shape.

As for can these be purchased: anything can be purchased if you find a seller. But it's unfortunately not easy to find sellers for cones and bearing seals of an unknown hub. Maybe if you try to see if you can identify the hub, what is the manufacturer, is there a model number, it may be possible.

If it's a no-name hub, most likely you will not find parts. But at least for Shimano it may be worth trying to find compatible parts.

However, the easiest way would be to bend the seal back to its proper shape and assemble the hub with the parts you already have. Your cone looks quite dirty, be sure to clean everything, remove all dirt and put fresh grease in. You may want to consider putting fresh set of bearing balls too, they cost next to nothing and are easy to source unlike cones which are hard to source since there are so many shapes.

However, it also may be possible the cone bearing surfaces are too damaged due to dirty grease inside the hub.

  • I was in the process of cleaning them out, will make sure to clean and grease. The other bike I just serviced (different brand) had the seal attached to the cone. the damage was me trying to take the seal out 🤦🏽‍♂️ Any tips on how I can identify the hub?
    – sReall
    Jul 5, 2023 at 18:03
  • If the hub doesn't have any markings telling the manufacturer and model number, you may be out of luck.
    – juhist
    Jul 5, 2023 at 18:56
  • No markings. Decided to bend them back into shape. Cleaned and greased up cup, cones and ball bearings, and pushed the dust shields back in
    – sReall
    Jul 9, 2023 at 18:51

Its a "dust shield" and is not directly part of the bearing - you can ride without it perfectly well.

Personally I'd try to keep it - the shield does protect the bearing balls and race from external debris

The shield is not load-bearing so you can simply friction-fit it back in place, perhaps with some gentle persuasion from a socket and hammer. Some 2 part epoxy should hold the shield in place too, but its likely too thick to solder

  • 2
    Riding completely without dust shield is not a good idea unless in very dry and clean conditions - water and gunk gets into bearings super quickly. (I tried both and got amazed at how such flimsy little things are so relatively successful at keeping gunk out - but as you point out, they are not load-bearing and unless sprayed with pressure washer, regular splashes are not that forceful either.) I usually smear those in thick lube (I use Morgan Blue aquaproof paste) when installing and then wipe the outside - that keeps the gunk out even better and also helps with somewhat bent shields. Jul 6, 2023 at 12:34

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