A compact 50T max with a smallest 14T certainly makes you legal. But when I was a junior, no junior would ever voluntarily stay that much under the limit. As sgt hedgehog said, see if a 52 x 14 on your wheels and tires gets you that 26-foot rollout. If it does (as it should), I'd go with that combo.android said:The Ultegra cogs have the sizes you need for junior racing. I think they start at 14. Match these with a compact crank and you are set.