I love bike gears and this is by far the best re-use I have seen to date. Etsy artist 1byLiz cleans up old bike parts and turns them into stylish clocks accented by coloful reclaimed fabric.
Each clock bears this little note:
"Each chain ring is thoroughly cleaned before use with every effort made to bring out its very best, however, due to the recycled nature of this product some scratches may remain."
For me the scratches and signs of wear are the best part. They add character and history and set these apart from similar more commercial verisons using brand new parts. Check out her shop!