I commuted 5000 miles a year, year round. I had to replace a rear rim once a year. The sand on the road would eat up the chain/cassette. 2 chains a year and 1 cassette a year. I replaced the middle chainring once in 2 years. Pads probably twice a year. Jockey wheels about once a year, never had to replace a derailleur. Have not regreased or replaced any hub bearings, need to do that. Hopefully the hub is ok.