That bicycle rack I got for Christmas didn't fit over my aftermarket rear tire so my husband purchased metal tubing and fittings to modify it. Basically, he had to make a sleeve to extend out wider across the top of the tire and down lower to rest on the bottom of the tire. Then he painted the new metal black and it now looks and works as it should. My uni-sex bicycle rides a little wonky on the back but it's secure and will get me where I need to go. Great for freeing up space in the back for more camping gear.