Thats a really good point, you would have to clean them after every ride I imagine if you did ride through mud, dont think they would get that dirty riding street (I try and keep out of water and mud when im out and about) And you can get them in different thread patterns so hopefully they wont be as slick. Website says 20" tyres are available in dirt or street... Definitely going to invest in some at some point in the future, you only live once. Black frame, bars and forks, white rims and white and black version of the tyre