Not a mechanic but I would have thought that if the bearings were that bad there could well be damage internally as well?
Also, perhaps a more regular maintenance pattern might prevent the bearings being "well shot"?
I suspect the OP has modern cartridge bearings in their wheels, so they will literally be a case of fit and forget. You could pop the seals and run some new grease in there, but again, getting the seals to seat again is a pain. I ran my bearings on the Kona for about 10,000 km with zero maintenance and that was with some hard use. When they start running rough, you just pop them out and pop new ones in. At about ā¬8 each, they are also reasonably priced. Because they are a sealed cartridge, you also run no risk of damaging the wheel hub when they are running rough. The only downside really is the fact that they are an interference fit in the hub and without decent tools to pop them out and drift new ones in, then you do run the risk of hub damage.
Reading through the thread, I think
@All uphill post really summed up my feelings until this post really got me thinking:
It wouldn't surprise me if five years was the planned lifetime. This is part of the reason for electronic gears, and E-bikes; it gives manufacturers opportunities to make model-specific parts that you can't just swap out, so it makes repair less economical. I can fix a bike from the 80's or 90's with no trouble at work using what I have in stock. Once Disc brakes enter the picture I have to deal with different brake block styles. If I get an Ebike I know I can probably forget being able to fix and sell it because the battery will be half dead and cost more than the bike is worth to replace.
Leaving aside E bikes for the moment, it made me ponder about modern bikes and the plethora of new standards that are on them, from hub splines and boost spacing to chain line standards. Just how much of this will endure 10 or 20 years down the line? Will you still be able to easily pick up quality spares for bikes running some of the more obscure standards?
As much as my heart wants to keep running my current bikes for the next 20 years will it possible? For me, I hope so, because some of the choices I've made on frames and components has been with half an eye on longevity. Like the fact both bikes have 74mm BSA threaded bottom brackets, or the Kona is running Hope brakes, a company that supports it's products for many years.