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Rebuild of rear hub on Giant road bike help

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Rebuild of rear hub on Giant road bike help

Old 07-16-22, 05:40 PM
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Microfiche
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Rebuild of rear hub on Giant road bike help

Mechanically inclined newbie DIY bike mechanic thinking of trying to rebuild the rear hub on my 2015 Giant Defy Advanced 3 road bike.
From what I can see, it has "Giant Sport Tracker Road" hubs - I think I saw 28H mentioned somewhere?
Where would I find out if it has sealed bearings or ball bearings, and what size they are?
Also - where would I find out what size cone wrench I will need, or do I just pull off the wheel and use calipers?
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Old 07-16-22, 05:58 PM
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Post a picture of the hub. If it has flats for cone wrenches, it is probably loose bearing. From what I can find on the Intertubz, they look like standard cup and cone bearings. The rear bearings are probably 1/4” while the front may be 1/4” but they may also be 5/32”
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Old 07-16-22, 06:09 PM
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Hub pics

Originally Posted by cyccommute View Post
Post a picture of the hub. If it has flats for cone wrenches, it is probably loose bearing. From what I can find on the Intertubz, they look like standard cup and cone bearings. The rear bearings are probably 1/4 while the front may be 1/4 but they may also be 5/32
I will pull the wheel off later - tied up at the moment. Does this help?


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Old 07-16-22, 06:46 PM
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As Stuart said, most hubs with a cone wrench set of flats will also be a loose ball and cone design. So with not actually having the hub in hand I'll give an educated guess at a few aspects. 15 and 17mm wrenches fort the cones and lock nuts. 1/4" balls, 9 per side. While you are at it consider flushing the freehub body and relubing that too. Andy (who has various measuring calipers about the house, as with reader glasses)
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Old 07-17-22, 08:06 AM
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Originally Posted by cyccommute View Post
The rear bearings are probably 1/4 while the front may be 1/4 but they may also be 5/32
Most front hubs I've worked on, Shimano, Sun Tour, Sansin, etc., use 3/16" balls, either 10 or 11 per side. Some Campy hubs do use 5/32" balls both front and rear.
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Old 07-17-22, 09:02 AM
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Originally Posted by HillRider View Post
Most front hubs I've worked on, Shimano, Sun Tour, Sansin, etc., use 3/16" balls, either 10 or 11 per side. Some Campy hubs do use 5/32" balls both front and rear.
You are correct. My mistake.
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Old 07-17-22, 09:05 AM
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Originally Posted by Microfiche View Post
I will pull the wheel off later - tied up at the moment. Does this help?

It a little hard to tell from the picture but it looks like the hub has 2 wrench flats in two different places. That suggests cone and lock nut to me.
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Old 07-17-22, 09:35 AM
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Thanks all, sounds like I will have to pull the wheel off and do some measuring to see what cone wrench I will need, and THEN determine the ball size once I have it apart.
I was hoping there would be definite specs for this hub out there somewhere.
Sounds like there is some degree of "by gosh and by golly" in bike maintenance.
From what I can determine without pulling the wheel off yet, the measurement across the flats on what I assume is the cone nut is 17 mm, so I will likely grab a 17 mm and maybe a 15 mm cone wrench and try to get this pulled apart.
Thanks everyone!


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Old 07-17-22, 10:21 AM
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Originally Posted by Microfiche View Post
...thinking of trying to rebuild the rear hub...
Sounds more like you're planning to *service* the hub... something that should be done at appropriate intervals.
Some may disagree with me, but if there's not much wear on the races I'd probably re-use the balls.
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Old 07-17-22, 10:49 AM
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The flats on that 17mm "cone" should be accessible to a regular 17mm open end wrench so a specific cone wrench shouldn't be needed. The inner, probably 15mm flats, should need a cone wrench to get to.
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Old 07-17-22, 04:40 PM
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Originally Posted by Microfiche View Post
Thanks all, sounds like I will have to pull the wheel off and do some measuring to see what cone wrench I will need, and THEN determine the ball size once I have it apart.
I was hoping there would be definite specs for this hub out there somewhere.
Sounds like there is some degree of "by gosh and by golly" in bike maintenance.
From what I can determine without pulling the wheel off yet, the measurement across the flats on what I assume is the cone nut is 17 mm, so I will likely grab a 17 mm and maybe a 15 mm cone wrench and try to get this pulled apart.
Thanks everyone!
The only rear hubs I've seen with other than nine 1/4" balls/side were Mailliard Helicomatic. (sp)
I think some of the more recent higher end Shimano hubs may differ on size & quantity.
MOST likely, your fronts are 10 (or maybe 11) 3/16" balls/side. I have seen 1/4" on cheap (Huffy) bikes.

I don't have the best vision, so I just replace the old bearings w/ new when I service hubs.
I don't worry about missing any pitting and I only deal with clean grease. I do lose my dirtiest (of 3 dirties) shop rag and move 2 down in the pecking order and use 4-6 Q Tips. I have enough rags in progress to keep me supplied.
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