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Discussion Starter · #1 ·
Hello

I have a 27.5 MTB to which I've made several upgrades. The frame is nonetheless an oldish, heavy, aluminum Ghost.
Since I will upgrade to a Scott Scale 950, I want to keep the best of the current byke, i.e. the wheels and the suspension fork. I'd like to build, with them, a bike for my son, on a carbon frame. The point is that my wheels are QR standard, with novatec hubs (D771SB + D772SB), and the steerer is straight, not tapered.
Questions:
1. Can you suggest me where to look for a (rather) affordable carbon frame, size 16-17, for 27.5 wheels, with straight headtube and QR (9x135mm) on the rear?
2. I know that I might find adapters for my straight steerer to fit into a tapered headtube, are there similar adaptars for my novatec QR hubs to fit into 12x148 standars?
3. Guys, what do you believe about the aliexpress carbon frames? Are they reliable? I'm looking, right now, at a Cube which is discounted for 350 Euro, but it's not the right size. I wouldn't go beyond that threshold, as a price per frame.

I want to build the bike in a rather traditional 2x10 transmission - no 1x12.
Thanks everybody!
 

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Discussion Starter · #3 ·
Thanks, I'll check those threads!
Xmcarbonspeed.cn doesn't ship to Romania ( where I'm from) buy plenty of AliExpress dealers do.
Also, on AliExpress I've seen that providing double rear axis (QR and 12*142) is rather the norm.
Don't know about the quality of those frames, though... I'll read those threads, thanks again.

This one might meet your needs:
650B Mountain Bicycle Carbon Frame MTB 27.5er

Do some searching at the weight weenies forum, as there is a lot of discussion on carbon:
https://weightweenies.starbike.com/forum/viewforum.php?f=1

some other discussion
https://www.reddit.com/r/bikewrench/comments/6gk18w
Chinertown - Index
 

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Discussion Starter · #4 · (Edited)
I was having this in mind, for instance:
https://www.aliexpress.com/item/Chi...749.html?spm=a2g0s.8937460.0.0.53362e0eItRgTw
Modern design, sexy looking, QR and adapter from tapered to straight available.

This one, a bit more "traditional", is nice as well:
https://www.aliexpress.com/item/Sup...496.html?spm=a2g0s.8937460.0.0.53362e0eItRgTw

But then, I've seen a guy on YouTube with a Chinese carbon hardtail frame snapped at a small drop. The whole rear triangle just snapped. This kind of turned me off..
 

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I think he will be fine with the Chinese frame if he is not to heavy. Have a careful look at the geometry of the frame to see if building it with your fork makes sense.

Also building a bike, at least for me, always ended up way more expensive than thought. Brake adapters, pads, discs, longer brake hose & bleed kit, headset, headset adapter, bottom bracket, cranks, bar, stem, grips, pedals, shifter, seat post, chainring, cassette, tires, tubeless ....... you might be better off buying a last year model and selling your old bike complete.
 
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