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Mar 25, 2003 3:03 PM
I just read the post for the number of bearings bearings for the rear hub and have a similar problem with the front hub. Can someone tell me number of bearings per side for (road) Ultegra front hub?
Mar 25, 2003 3:59 PM
The exploded view in the pdf file downloadable from shows 10 balls on each side. The US shimano website recently loaded the pdf files for download but it did not work when I just tried it. My recollection is that 11 will fit, but every loose ball bearing system I have ever seen always had one fewer ball than would fit. Don't know why, but I always replace the number that came out.
Mar 25, 2003 11:20 PM
I seem to remember 11 as well. But here's what you do.... pull the old balls out. If you have one, that's all you need. Go to a good hardware store or auto parts store. Buy about 25 or so of them. Shouldn't be more than $5. Or go to the LBS and pick up some. Put a bead of grease in your race. Place as many bearings as you can fit in there, then take one out. You don't want them to touch each other. You want as many as you can fit as long as they ride on the race, and not the bearing next to it. Do the same for the other side... Then put more grease in, and put your axle back together. Adjust it so it feels smooth, but there is no play when you rock the rim and axle. Easy to feel in a frame or truing stand. Tighten your locknuts, you are golden.

Anyways, should be like 11 each side, but put as many as you can as long as they don't touch.

Don't trust harware store bearings!!!!Alexx
Mar 26, 2003 5:40 AM
What grade are those bearings at the hardware store? Grade 25? 300 grade? Do you know the difference? Does the moron behind the counter? Wanna f#%k up your hubs?
Go to a bike shop, get the right bearings.
Don't trust harware store bearings!!!!russw19
Mar 26, 2003 8:39 AM
I did say "good" hardware stores... like the local indy mom and pop store where they still know their stuff. Not the local John Madden Ace is the place store.

Guess I should have emphasized that more.

And yes, I know the difference between grade 25 (Campy Quality in bike shop terms)and 300 grade.

The grade specifies how round the bearings are in millionths of an inch. Thus, grade 25 are round to 25/10^6, while grade 1000 are good to 1/1000. Lower number, better bearing.

Auto parts stores are more prevelant in most people's towns than bike shops. Most of them know the difference as well.

But even if you get 300 grade bearings, they aren't that round, but they are most likely close enough on an already worn Ultegra hub. Anyone know what Shimano specs on Ultegra hubs? I don't. I would guess they use better than 300 grade, but they could use worse, I have no idea.

But good advice anyways. Make sure you and the person you are buying from know the difference.