As Tim noted, it's a good idea to have a complete spare hub (F & R) since it is not an easy repair at the track. I found that the rear bearings do seem to need frequent checking for play especially if you run a lot of rear camber.
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I think Tom meant a complete spare 'upright' assembly and not just the hub.
You need a hyd. press to replace the hub & bearing so it is not a simple fix at the track, but you can swap the entire upright in about 10-15 minutes. BTW - replace your wheel studs while you have everything apart.
I replace my hubs & bearing once a year on my Prod car and I see higher g-loads than an IT car.
I rebuild my spare uprights once a year and 'rotate my stock' as it were. The old upright becomes the spare. Before the next season, I rebuild the spares again and swap them out again, repeating as required.
I've had one front hub break, and found a cracked hub once. The hub that broke had 13 races on it. The cracked hub was back in the late-80's when tires weren't quite as sticky as they are today. It had about 30 races on it. It really sucks when your tire beats in into the corner
It's been my experience that the rears aren't so critical and seem to give you warning before they go bad by getting noisy. I replace my rears every other season.
Edit - I was referring to 84-87 Civic/CRX for car types.
2002 Cen-Div ITC Champ
(Converted to G-Prod in 2003)
(Bumped to H-Prod in 2008)
2008, 2011 HP Cen-Div Champ
2011 HP National Champ
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