Use leads to wear and tear. Regular use, while training for a Gran Fondo will speed up this process. Chains and cables stretch, cassette and chain ring teeth wear down, tires bald, and brake pads rub away with the friction of braking. Cable and chain stretch are two of the more common maintenance issues you will face. Learning how to perform minor adjustments, in order to fine-tune how crisply your gears shift, will save you trips to the bike shop. That being said, your bike will need a service before race day.