jan_nienaber said:Hello DNAtsol,
Perhaps this might give you some idea of what lifetime you can expect:
I'm riding a 15-year old Specialized Allez Epic - the one with the carbon tubes and Aluminum lugs. I bought it from someone else about 2 years ago.
The bike is equipped with original 105 components throughout (even the hubs). I added 105 clipless SPD pedals myself. The gears and brakes are original stuff - the headset, cables, chain and the chainrings were replaced several times (plus the pedals as I mentioned). I think the brake calipers are the first generation of 105's that had the dual-pivot brakes.
I am currently putting about 300 - 400 kilometers per month on it. I have no reason to believe that the previous owner treated it like a "Garage Queen" - he was a real Roadie, I can tell one when I meet one!
The gears shift perfectly, brakes work fine, everything works GREAT! My (very humble) opinion is that the difference between 105, Ultegra and DA is mainly weight and finish. Someone else mentioned in a different thread that the longevity of the higher-end components might actually be less than 105 / 600 (I'm old enough to recall that Ultegra used to be called the 600 series back in the 80's) due to lighter components being used (I dunno if it is true, so don't flame me).
So I reckon with proper care, you don't have to get anything else for the next 15 years at least ;-). Frankly, I am more worried about my frame coming apart - I love the old Specialized frame and the way it feels. I have no idea if I will ever be able to replace that if the lug glue or carbon layering eventually fails one day!
Jan in BC, Canada
Actually I was comparing the lower end Shimano no name, Sora, and Tiagra to the higher end Shimano 105, Ultegra, and Dura-Ace. The Shimano no name, Sora, and Tiagra use a lot of plastic parts and these tend to wear more quickly, but we are talking high hundreds to over a thousand miles before it gets noticable. The higher end Shimano 105, Ultegra, and Dura-Ace use little plastic and typically last many thousands of miles. It is impossible to put a mile count on it due to variations in the maintenance the components receive and teh rider's riding style.
Jan, no flaming here but I have an all Shimano 600 EX equipped bicycle from the 1980's (even has a fifth set of Bio Pace Chainrings). It has nearly 18,000 miles on it and I have not noticed any wear related problems with the components. I have had to replace the idler and jockey pulleys a couple of times. Of course this bike is my baby so it gets extra special care and attention and new brake hoods last year off eBay! It gets fully cleaned and lubricated, including the cup and cone BB, after every ride.