Good morning all

I have just purchased a 2021 Trek FX1 disc in charcoal grey (super colour!)

I bought it mainly for commuting to work as didn't want to keep using my 2015 Trek X caliber 8 on the road.

I have to admit to having no great knowledge or experience of hybrids therefore wasnt particularly fussed re spec although the disc brakes did appeal- I didn't twig these were mechanical ones.

On collecting the bike last week I had a 5 mile or so ride home. I immediately noticed the gears were very poorly set up with lots of clicking/rubbing across various gears and occasional chain slip/jump. The brakes also felt largely ineffective but I knew the pads were new.

Over the coming couple of days the brakes improved slightly however any heavier braking would follow with a chugging/rubbing from the front brake for the next 20 seconds or so.
​​the rear hub also sounded graunchy.

It went back to the shop and they told me they replaced the rear hub (or cassette I can't recall which) however the design of the FX1 means it's noiser than a cassette fixed to the wheel- can you tell I don't know my bikes ha?!

They told me they had tuned the gears and the brakes were normal.

Since then I've found the gears to be a little better- no slipping now but still generally noisy with some gears being worse than others and general drivechain noise/clicking etc

The front brake will still chugg loudly after any heavy braking.

I'm a bit disappointed tbh- surely the drivechain although a basic 3x7 should be quieter than it is? Can I upgrade any parts to improve it without having to change the shifters? (Which are combined with the not very good mechanical disc brakes) I gather another cassette may need a different back wheel fitting.

Any brake suggestions?

I'm kinda thinking it needs upgraded gears/ shifters and hydraulic brakes but that'll be very pricey I expect! Frustrating as the FX2 is only £100 more with a different drive chain altogether (and 2x8 which looks better)

Any help gratefully received!