I ride a BMW F650 classic with 13500 miles. It is a year 2000 model and I ride only on road. The chain is original and I lube it well with ATF about every 500 miles. The chain has a couple of tight spots but it is still in usable condition. If you want a chain to last very long you will need to use a lube that does not hold dirt. even the best lubes will retain some dirt however. The rear sprocket of this model F650 is reversible and I turn it about every 2500 miles. The front cannot be reversed however. A chain in a dirty environment will not last very long no matter what you lube it with and you should not expect it to last very long. The front (smaller) sprocket is going to wear out faster so watch this one for excess wear.