If it's fixed, with no front brake, I guess the rims can stay pretty clean. But not that safe if it's being ridden anywhere other than the track. My daughter made the mistake of getting white rims for her current fixed- the stolen one was a black and gold theme, so she decided to go for a white and gold scheme next. We picked up an old white 70's Raleigh frame for next to nothing, and her dad bought the requested wheels (with gold spokes) for her birthday. However, I insisted on fitting at least a front brake. After a year, the front rims were almost completely stripped back to the alloy. Not quite the hipster bling look any longer.