BMX Hub Tips - Ball Bearings in the Front Hub
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- Опубликовано: 15 сен 2024
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Working on your BMX bike sometimes means getting into the nitty-gritty of things. In this video, we're answering a question that came up in our BMX Nerds Discord about the intricacies of ball bearings and unsealed hubs. We discuss the best practice when dealing with these parts and even ask the question - are they worth it?
If you've ever wondered how many balls should be put in an unsealed bearing, or if it's worth the hassle, then this video is for you. We discuss the common views about packing as many balls into an unsealed bearing as possible or taking one out for extra bearing movement. We also share a quick story about a personal experience with unsealed bearings that will give you a better perspective.
Perhaps most importantly, we discuss the value of your time. Is it worth it to spend hours working on an unsealed hub, or would it be better to work a couple of hours, earn some money, and buy a new sealed front hub? Sealed front hubs are not only time-efficient but also offer better performance and longevity.
If you're working with a tight budget or have no option but to use an unsealed hub, we offer practical tips on how to handle this situation. Remember, the aim is to get your bike in the best shape possible, not to have a high-end part that won't deliver what you expect.
This video aims to provide practical, clear, and concise advice to help you maintain your BMX bike. And as always, we have a vibrant community of BMX enthusiasts on our BMX Nerds Discord who are eager to help you progress in your BMX journey. Click the link in the description to join the free Discord. See you there!
#BMX #BMXMaintenance #UnsealedHubs #BallBearings #BMXBike #BMXCommunity #BMXNerdsDiscord
Gotta have the sealed hub. Not only do they last longer once you get one you’ll be like “WOW THIS IS SO SMOOTH YOU CANT EVEN HARDLY HEAR THE HUB ANYMORE” 😂
Nothing wrong with repacking loose ball hubs. Make it worth the effort by cleaning parts well, using hi grade balls (gr 25) and using proven waterproof grease. For ball counts, remember the load full and remove one trick. If cones and cups in good shape, then YES the repack pays off and you gain valuable skills with the final adjustment. There should be no play after tight and in place on fork and frame. And a little grease oozing out is good, just wipe excess off right away. Some loose hubs have such good sealed mech so this pays off.
Full or not of bearing balls in hub is a tricky question and important as it relates to the resistance of wheel rotation as a function of the friction between the balls and the hub. I assume, based on experience, that the fewer balls the less total friction but more wearing as the pressure on each ball is greater than more balls. The opposite is that more balls the more total friction but less wearing as each ball shares less force. So, the optimal number of balls should be in the middle ground, i.e. not full in the hub nor too few.
I think they want to adopt it from fixie bikes. Some of them still uses ball bearings but in really high quality. Something like japanese dura ace njs thing.
So the answer is 9 ball bearings 99.9% of the time. Maybe your is weird, but it should look more or less full in any case. I don't recommend using caged bearings. Buy a tub of wheel bearing grease from you parts store. It is not the absolute grease that money can buy for this purpose, but it works great and you can do hundreds of hubs for $9. Also, 1 or 2 hours of work for a $36 hub you are making $18-36. I don't know where you live but most people are not making that much where I live. Plus factor in you need to spend longer re-lacing your wheel than you would rebuilding your axle. At least I would. The alternative is paying a shop to replace it and at the point buying a pre-made wheel would probably be more convenient and quite possible cheaper.
Also, what happens when this new hub fails? They tap the old bearing out and press a new one in? That is even harder than servicing a cup and cone bearing. They buy a whole new hub/wheel again? Not only is that expensive, but very wasteful. I love my cartridge bearings for their long service interval, but if someone was new to servicing hubs I would recommend buying a set of cone wrenches, buying a pot of grease, if necessary buying loose ball bearings and learning a bit more from someone willing to teach instead of recommending they buy.
I always went by, if you neatly can plop a full row of balls in the cup with no gap, then remove one. JUst look at most Asia made loose balls in the hub after removing cones, you'll see the gap. Many have pretty nice lip seals these days, so pays off repacking hubs with good grease. Dont leave solvent residue in hub when cleaning, rinse out good then dry. Dont use the original Park Bearing grease, it failed on me in rain, destroying the cones and cups of hub! And don't ride with hub play.
Anybody here run Si N4 ceramic balls in your loose ball hubs? Results?
Buying a new front wheel would probably be the cheapest and fastest alternative to buying a new hub. Buying a new hub would also mean you’d need the correct spoke size for the wheel. To risk stretching spokes. You’d also have to have the knowledge of how to re-lace a wheel which I’m assuming most people don’t, then you’d have to take it to a bike shop where they will charge you the same price as you’d buy that we the people hub for. Then you’ll have to say 3-5 days at best for your wheel to be finished.
New complete front wheel > buying a new hub, risk of needing new spokes, paying for manual labour to re-lace
But most definitely if you’ve got a ball bearing front wheel, you’ve purchased a stock bmx build. You can buy a nice aftermarket front wheel for around $50, instead of waiting and spending 60$ and waiting for your new hub to be laced
already got a sealed rear hub😂 thanks alot.
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