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Bump on the sidewall/life span of a hub(7 posts)

Bump on the sidewall/life span of a hubLone Gunman
Oct 1, 2001 4:57 PM
Relatively new tire, less than 300 miles, Conti GP3000 has a bump on the sidewall, not huge, but a bump no less. LBS says I hit a pothole that caused it and that it could be trouble. Never have seen this before, anyone with experience with this? Is it possible to re-enforce this spot with some plastic to prevent a failure? Also expected mileage lifespan of a hub?
re: Bump on the sidewall/life span of a hubnee Spoke Wrench
Oct 2, 2001 5:22 AM
A bulge anywhere on a tire means some of the cords are cut making the tire casing weaker in that area. If it were my bike, I'd replace it. At my age the bones break more easily and heal more slowly.

The unfortunate fact is that higher performance tires are lighter and more supple but also cut more easily. I'd think about how you really use your bike. A thicker, heavier, more durable tire may or may not make more sense for your style of riding.

I think that the money you spend for decent quality hubs is a very good investment. It's not unusual for a hub to outlast several rims. Good quality hubs, with minimal maintenance, will last a very long time.
re: Bump on the sidewall of lifedzrider
Oct 2, 2001 6:33 AM
The bump will grow and one day you will feel it, bump, bump, bump, bump ..., like a flat spot on a wheel. Then it will blow out. I'd replace it before any of that happens.

Hubs last years, especially if you don't do much rainy day riding. I don't count my miles so I'm not much help.
Toss the Tire....Greg Taylor
Oct 2, 2001 6:48 AM will only get worse. The casing of the tire has split, and it will eventually fail, probably when you are screaming down a mountain switchback at 50 mph.

A decent quality hub can last for a looong time, with proper maintenance. They don't have to be expensive either -- the mid-level Shimano hubs (Shimano RSX-100) on my beater are holding up well to the daily commute. I repack them every six months (new bearings/grease) and lube the freehub at the same time.
yoWoof the dog
Oct 2, 2001 9:14 AM
any pointers on lubing the freehub body? I have Zinn's book, but not sure whats the fastest easiest way. Whats the grease you use?

woof the dog.
What I use....Greg Taylor
Oct 2, 2001 10:10 AM
....I bought a "Morningstar Freehub Buddy" from Third Hand. Once you remove the axle and grease shield and clean out the races, this critter plugs into the cassette carrier. There is a grease/lube port on top that you then use to pump lube into the freehub mechanism. Do it right and it purges the gunk out of the bearings and lubes them up really nice.

As for the lube, I use Finishline "Cross Country" chain lube. Mobil One works well too. I've used light grease (Pedros, etc.), but it can cause its own issues. In cold weather, it can add drag to the freewheel and, in some cases, cause the chain to sag when you coast. I also wouldn't use grease on Shimano's "silent" non-ratcheting hubs -- the mechanism relies on ball bearings to engage the drive, and the grease can hold them in place and make the engagement very erratic. I know both of these from experience...
re: Bump on the sidewall/life span of a hubTig
Oct 2, 2001 8:59 AM
The cheap low-end Conti's my bike originally came with developed a side wall bulge on the front tire the very first week. There was absolutley NO exterior damage to the area. The problem happened from the inside where there was a defect in the threads. The LBS offered to replace the front tire with another. Instead, I let them knock off the new price value of the original tires of the upgraded tires I bought.

I don't know how much life you can get out of a hub. I put over 30,000 miles on a set of Campy Chorus hubs but sold the bike. I'm sure they are still spinning strong as long as the new owner takes good care of them. I'd replace the ball bearings each winter (about 9000 miles old), and repack the grease halfway through the year and they kept smooth and reliable. I bet a well maintained hub could outlast most frames.