I bought a 2nd hand hubs. It's a Shimano Dura ace HB 7600. and the dust cone or cover is kinda small and it's exposing the bearings for a millimeter or so. And I have gone to a lot of bike shops (Believe me) and they say they have NONE! and the only way to buy a Dust cone is to ship the Shimano Hb 7600 dust cap from Japan. And I can't afford that and also i can't wait. Help guys even a DIY method would do. or.... That exposure is pretty fine? Need your helps guys

I would not worry about a 1mm gap. That's actually pretty good, most bicycle hub dust seals are worse, especially the vintage ones. Not a problem if you regularly (once a year or so) clean and regrease the bearings.

I'm not sure if it's 1mm. But I can see half of the bearings... And I can't give pics cause I don't know how on a cellphone :'(

Run a bead of silicone seal around the cones, tapered up to the locknuts. A very small amount of grease or oil on the dust cap area will prevent the silicone from sticking to the hub flange. It will seal the bearing, and once it cures it can be removed and replaced. It's a trick I used when I commuted year-round in MI and no hubs had seals. I also used a short section of inner tube, greased on the inside, around the lower headset bearing.

Industrial "O" rings come in all sorts of sizes. Take your hub and axle to a better hardware store and see if they have a small enough cross section ring in a close to snug diameter. Multiple rings can be "ganged" on the outside of the axle spacers/cones/lock nuts to further keep a seal against the hub shell/freehub body. Stein does this with their Zerked BB Grease Injection System. Andy

I would probably just pack the gap with grease and ride. Re-check regularly.

I'm ignorant about things racing, but since that's a track hub, is it supposed to be that way to drip oil in it**********

Are you sure that you have the right cone?

It's easy to find a replacement cone that matches the axle threads. Finding a replacement cone that matches the hub's dust cover can be another story.

I'm not convinced that it has the right cone either, that gap sounds bigger than it ought to be.

Even so, if you're using it for track racing, it's fine. It's not so much to drip oil, though that can be done. It's more that because it's a track hub, it's not designed to be weatherproof. Indoor tracks of course don't have weather, and outdoor tracks are slippery when wet. An unnecessary lip seal will only add friction. Granted, not enough to matter unless you're going for a world record. But some track racers weight-balance their wheels too.

(Only in professional Keirin do riders race on a wet track. Their tracks are very grippy, in fact abrasive. That's one reason they pad up more like a hockey player than a cyclist.)

Front?

https://www.bikeonlineshop.net/shima...t-hub-dust-cap


Rear?


https://www.bikeonlineshop.net/shima...r-hub-dust-cap

boi this is what i really need

its the wrong "Bearing cone" And i need that Y26810000 but its a hassle

And btw this is my DIY solution... And the current bearing cone is not in contact with the bearing... and im still gonna file the rubber O ring so that the bearing cone will smoothly rolls and not Compress with the O rings and no Tight spin