Last summer, I bought my daughter who was 10 yrs. old at the time, a used Scott Speedster Jr24. The bike itself was in excellent condition with the typical Sora drivetrain. But one of the best upgrades I did on my daughter's Scott Speedster Jr24 was removing the Sora shifters and replacing them with the Claris R2K shifters. The levers on the Claris shifters can be adjusted for reach and that made a world of a difference on my daughter's hands. She felt so much more comfortable and immediately noticed how much easier it was to shift and brake. Now, she's asking to go clipless so that is next on the list.