Carbon wheels from china – reason why – cheap, why not – getting hit with import duty / vat, quality control, warranty or lack of, if you need to warranty , cost of sending back to China, resale, not good compared to a big brand.
Tubsvs clincher – for simple practicality, stick with clinchers, you can replace an innertube at the side of the road, changing a tub mean carrying a whole tire (tub) as replacement, if you have a support car following you at all times, go for the tub.
Handlebar width – have a look here[/url]for how to measure, there is also shape to consider, would to to a good road bike shop to see / feel the differences