Like someone else mentioned, scar tissue isn't the best place for a tattoo. Ink doesn't behave normally because the skin is so different. It's more likely to fade or heal oddly.
Also, remember that it's hard to have a very detailed and small tattoo. Do you want something small and simple, or very detailed and larger? Everyone is spot on in suggesting searching high and low for a good, reputable artist. Tattoos can be expensive (and addictive) but it's going to be their forever and it's worth the high price of a good artist. I've spent nearly a grand on tattoos and don't regret any of it. It's money well spent for the personal meanings and reminders that are always with me.
ETA: I don't know where you're at, but bmezine.com is a great resource for ideas and information about tattoos. I've seen a lot of cycling tattoos in the sports section of bmeink. Also, they have a lot of artist portfolios there that you can peruse from home.