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Old 01-17-07, 01:32 PM   #1
Cyclologist
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Bearing size for front Shimano WH-R550

Got a nasty crunchy grinding sound in the front hub of a BRAND NEW set of Shimano WH-R550 wheels. Spoke with my LBS shop owner who suggested I try repacking the hubs first to see if that helps. Can anyone verify the size of the bearings for the the front hub of this beast? How about the number of bearings?
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Old 01-17-07, 01:46 PM   #2
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not sure this will help; but try this e-bay post: http://cgi.ebay.com/Ceramic-balls-hu...QQcmdZViewItem
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Old 01-17-07, 01:49 PM   #3
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Quote:
Originally Posted by ebay listing
56x3/16” = $96.32

(7800 hub/wheel set)

28x5/32” + 26x3/16” = $92.88

(7801 wheel set)

22x3/16” + 18x1/4” = $68.80

(6600 Ultegra hubs, 5600 105 hubs, WH-5600, WH-R561, WH-R550, WH-R500, M960 XTR, M760 XT etc)


22x3/16” + 34x5/32” = $96.32

(2007 WH-6600, WH-R601)

60x5/32” = $103.20

(newer campy adjustable hubs, Zonda, Eurus, Neutron, Hyperon, Bora etc)

28x7/32” + 9x1/4” = $63.64

(older Campy hubs, check your hubs’ specs)
Since they don't explicitly state it, which is safe to assume is the front? 3/16?
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Old 01-17-07, 01:49 PM   #4
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Just exchange them. There's no reason you should be doing anything to a brand new set of wheels.
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Old 01-17-07, 01:59 PM   #5
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Originally Posted by voltman
Just exchange them. There's no reason you should be doing anything to a brand new set of wheels.
I didn't get them from my LBS. They came off a brand new bike I bought at closeout through a shop through eBay. To me, it would be more trouble to try to ship wheels around than it would be to swap out the bearings and regrease, if that might do the trick.
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Old 01-17-07, 02:52 PM   #6
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Odds are VERY good they are just improperly adjusted.

Many factory wheels come with the bearings too tight, the thinking being that they will "break in" (if you call that thinking).

Try loosening them up until there is a slight bit of play when they are off the bike; tightening the QR will take up that play and they will be perfect.

At worst you might have to repack them (I would anyhow, but that's 'cause I'm anal) but I seriously doubt the balls need to be replaced.

FWIW, I think the 550s are the most unappreciated bargain in cycling.
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Old 01-17-07, 07:53 PM   #7
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By all means take 'm open and look.

The balls are 3/16, yes, I can verify. You'll need a weird 17mm cone wrench to disassemble the front wheel (thanks, Shimano).

I know all these things since I had a new R550 front with about 700 miles on it that started crunching. Took it apart for a repack (which seemed odd, hell at 700 miles?) and discovered there was a pit on a cone.

(Denouement: the LBS I bought the bike from were turds and even tho it was under warranty (less than one year from time of purchase) they wouldn't even warrantee me the lousy cone. JUST THE CONE! So I sent the cone back to Shimano (consumer warranty!) and they sent me a whole axle assembly, postpaid and no questions asked. Considering all the LBS woulda had to do was send that $5 part back to Shimano just like I did myself, guess where I won't be spending a dime in the future.)
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Old 01-17-07, 08:05 PM   #8
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that is poor customer service! It's been my experience that hubs often come adjusted too tight. A job with good attention to details would prevent that from happening.
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Old 01-17-07, 08:06 PM   #9
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Quote:
Originally Posted by bjkeen
By all means take 'm open and look.

The balls are 3/16, yes, I can verify. You'll need a weird 17mm cone wrench to disassemble the front wheel (thanks, Shimano).

I know all these things since I had a new R550 front with about 700 miles on it that started crunching. Took it apart for a repack (which seemed odd, hell at 700 miles?) and discovered there was a pit on a cone.

(Denouement: the LBS I bought the bike from were turds and even tho it was under warranty (less than one year from time of purchase) they wouldn't even warrantee me the lousy cone. JUST THE CONE! So I sent the cone back to Shimano (consumer warranty!) and they sent me a whole axle assembly, postpaid and no questions asked. Considering all the LBS woulda had to do was send that $5 part back to Shimano just like I did myself, guess where I won't be spending a dime in the future.)
Spend a weekend in that store sharing your experience with people shopping for new bikes...

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