Considering getting a Genesis Croix de fer 725 frameset. It has 9mm standard quick release drop outs. Current donor bike has 12mm thro' axles. Has anyone carried out this retro step? The reason is, Genesis Croix De Fer 853 12mm thro axle frameset is £900and the Croiv De Fer 725 9mm QR frameset is £500. £400 difference seems a big difference. I have seen conversion kits available for £15, and wondered if anyone here has any experience of this.