This is what our research found. Average lifespan of a angular contact Wheels Mfg bottom bracket. 5000 miles. Ceramic bearings lifespan varies greatly and is very dependent on conditions.
First, you should know when it's best to service or clean your bottom bracket and crankset. At the very minimum, I do it about each season change, but normally more. Every three months or so I'll take the cranks out and if it's a threaded bb, I'll remove the bb and do the full service.
To check if your BB needs replacing, drop the chain off of the smallest chainring and spin the cranks. If there's a side-to-side wobble, or feeling of grittiness, it's time for a new one.
Simple rule is (unless you're starting a long trip) "if it ain't broke don't fix it". Do normal maintenance, keep things properly lubed and your BB should last for another 4,000 miles or more.
The fail by water and grit entering the bearing and causing the cartridge bearings to get loose. This is felt by poor shifting or chain rub, and finally the bearing can get very stiff if the balls jam up inside. External bearings can be cleaned and adjusted. Most have some sort of seal that can also be replaced.
After 5,400 miles it is reasonable to replace the rear cassette and chain. The front chainrings may need replacing if they have been ridden with a wornout chain. The rest of the crank: the spindle cranks and spider should be fine. Sometimes it is cheaper to replace the whole crankset.
In the case of the bottom bracket, you will use the grease when you install it, whether it is threaded, press fit or similar, and in the same way when you install or clean the cranks. The point of contact of the cranks with the bottom bracket should be greased too.
If you keep the chain clean and lubed and NEVER ride in the rain (but what fun is that?), chainrings can last many thousands of miles. It's hard to put a number on it, because things vary even under ideal conditions, but you could get 20,000 miles if you're lucky.
Most of the time, the true cause is a loose chainring bolt—tighten them up and that'll quiet most creaks. After you check the chainring bolts and if you still hear the noise, look at your pedals, crank bolts, seatpost, and seat. By checking these first, you'll save an hour of digging into your bottom bracket.
(Click here to read BikeRadar's complete guide to bottom brackets.) According to Friction Facts' latest report: “No statistically significant difference exists showing a general advantage or disadvantage of a standard type under similar loading conditions.
A clicking noise is the most common sound your bike can make. It can be due to the rider pedaling fast, and the chain wants to jump up and down the rear cassette to accommodate the demands of the pedal. To identify the sound, you can slow down from pedaling and observe whether you still hear a sound.
So, why does my bike chain slip when I pedal hard? Your bike chain can be slipping or skipping for a number of reasons but the common reason for this is that the shift cable is stretched. There are a number of other reasons such as the chain being too long, or your derailleur may be damaged and needs to be replaced.
The noise you are hearing is the pawls, which are spring loaded teeth. These teeth allow the hub to move forward when you stop pedaling, by moving out of the way.
Very Roughly: bike cassette can last between 4000 to 6000 miles, and some can last up to 10,000 miles, an equivalent of 3 to 4 chains, it depends on the quality of the cassette itself, maintenance, and riding conditions.
A steady rider who stays on the big ring, keeps the drivetrain clean and doesn't let the chain get too long before replacing it, and started with good quality components can get 60,000+ miles out of a chain ring.
Chainsets should last lots more than 4000 miles. Any club rider would easily put that in in a years riding. Its only 80 miles a week.
WD-40 is a great bike chain lube water based lubricant and will not only lubricate the chain well, but will also keep it rust and corrosion free. It also minimizes the accumulation of dirt which reduces the wear and tear of the chain.
Cranks. The most common cause of creaking is the crank being loose on the spindle. Remove the crank bolts, lubricate the threads and under the bolt head, and reinstall. Tighten the bolts to the manufacturer recommended torque.
As mentioned, you will want to replace your bike cassette at least once every three years, even if you are not riding super regularly. However, if you are riding your bike a high mileage each year, you will want to change the cassette each season.
"Rough/noisy running is the best way to tell if a chainring needs replacing," says Chris Mckenney of SRAM. "Unless a chainring is well beyond its service life it is very difficult to see this visually; chainring teeth slowly take on the shape of a shark's fin in use.
Once the chain wear is approaching 1% “stretch”, it's usually time to replace the cassette as well. Because the teeth on the cassette will have worn down to more or less match the chain wear, if a new chain is fitted to a worn cassette, it won't mesh properly and may jump or skip, especially when changing gear.
“First of all, the wheels on expensive bikes tend to be very light, sometimes hollow, so the noise of the freewheel is amplified as it vibrates down the spokes to the rims,” chimes in Andrew Laws, a cycle blogger and former editor of the bike news site VeloBalls.com.
Since higher-end hubs use stronger springs and have a greater number of pawls and engagement points, those models produce louder and more aggressive sounds. Also, more advanced hubs rely on lighter grease which doesn't restrict the motion of the springs as much.
A spring-loaded part that engages a set of teeth when moving in one direction, but slides over them when moving in the other direction. The pawls in a freewheel make a ticking sound when a bicycle coasts.