Thanks for your response!
First, the problem with 'every component should be chosen, not randomly selected' is that I have NO idea what I need , and the sheer amount of options there are overwhelming me.
I thought buying a prebuilt would help me in that regard. Maybe not.
Thanks for the recommandations about tire clearance and brakes!
I failed to mention, right now on my RC120 I have some dtswiss p1800, that I could eventually.. cannibalize for a new build. I also have 40c maxxis tyres.. anyways

The LTK268-D you mentioned (and others from the same company) don't list prices on their website but simply invite you to 'inquire'. I.. don't like that . Why not put the price in full display? And the website itself seems hosted on a 50 euros PC with an ADSL connection.. jesus christ..

I'll definetly look into that thread you linked!

Thanks!

Hello,
I've been riding my first road bike, a Decathlon Rc120, for 4 years now, and I want a new bike, mainly just to feel more motivated to ride more.
Looking throught aliexpress listings, seems like building a bike from scratch with components with a good reputation will costs me 1.5-2k, a little bit more than what I wanted to spend.
After a little bit more search I discovered this company, Seraph, that makes impressively cheap already-built bikes, and I really liked the TTX 42.

UNFORTUNATELY it comes in a max size of 56, and from what I read online, for someone my size (1m86) a 58-60 size would be a better fit.

What do you think? Should I go with the TX 71, which comes in a max size of 58, or just stick with my decathlon bike, and buy a 12 speed groupset?

I'm really confused; there's so much choice, and I've always been a highly indecise person. I've been researching for about 2 months now.