I own a Triban RC100. Some points you may find useful.
1. I am very happy with the bike. Ordered online and needed to attach front wheel and handlebar. Every thing worked out of the box and continues to work fine. Zero need for any repairs.
2. 7-speeds with single chainring can be constraint if you bike in a hilly area. A triple crankset, with appropriate chainrings, will address that.
3. Prices outside North America are around $350. So, value may be lower for you.
4. The frame is good and worth upgrading. In fact, I bought it for the frame, fork and non-drivetrain components.
5. Bought RC100 over RC120 since I prefer non-carbon fork. For a young kid, a steel fork is probably better.
6. If at all possible, get the small size over XS. It can easily be adjusted to fit heights at least till 5'8". I am 5'8" and could've ridden S thru L, maybe even XL ignoring standover height. Got an M.
7. It comes with a lifetime warranty on non-carbon frames and forks (probably 5 years if carbon) and a 2-year warranty on the rest.
HTH
Last edited by anga; 02-03-22 at 09:29 PM.