I know that the answers to this question will be extremely variable due to riding conditions, chain condition, etc but I have never ridden a bike for this many miles since I was a youngster. When I was 10 - 14 I couldn't care less about bike condition. I just hopped on and rode. I purchased my Felt F75 in March of 2010 and have currently ridden it 3400 miles. I replaced the factory chain with a new one at 3000 miles. My Park chain gauge told me it was time. I checked the rear cogs for wear and really didn't notice much at that time. The other day while adjusting my front deraileur I noticed on the big chain ring the beginnings of the "shark tooth" wear on the teeth. Not affecting performance yet but I just didn't know if this should be normal for the miles on the drive train. The crank is Shimano 105 compact 50/34. It is the stock component that Felt put on it.
Like I mentioned above, I have no past experience to judge how long a chain ring should last. I want to ride this steed for another year or two. If I upgraded crank/chainrings to Ultegra would effective service life increase or remain about the same?
Your input would be greatly appreciated.