\[Context, question in the end\]
So, I recently moved to a new city where It's much better to move around cycling (car traffic here is really intense all the time), so I started to ride my old bike(a Caloi 100 from 2010 maybe?) (going back an forth to college, back home, between campus...).
I had to change some parts, so I got:
New tires (old ones were cracked, and I also took the oportunity to get smoother ones)
New tubes
Changed the back rim to a double-wall
New changers
New handlebar grips
Also installed a slimmer seat and a back rack.
I had a lot done, and yet, I was frequently having to repair new problems that appeared; so I got a new bike (the one in the last photo, caloi Aspen, an brazillian brand and model) that is really good, much better components, and event tho it's more of a MTB, it doesn't really handle the MTB job, since it's a good entry level bike, but not as strong as a MTB should be.
I'm using the new one by now, and I wanna take the advantage of owning a reliable bike that allows me to move around, to spend the proper time and money to repair and modify my old one to a commuter (the old one suits this job much better, since it's way ligher than the new one, that wheighs around 16kg).
The main problems I'm facing:
\- I'll have to take the new rim to the mechanic that changed it (he changed the whole wheel) cause the cube (I don't know the name in english, but I mean the part of the wheel than contains the bearing) is dilated, and the bearing is getting out ou place as I ride
\- I'm having trouble finding a way to make it more agressive to ride: the handlebars position are originally intended to ride in a 90⁰ relaxed position, and I don't know how to change it. Do I HAVE to change it?
\- wanna get rid of this stem, but I have no idea how do I change it, since I don't know which components are compatible with the bike. BUT if there is any other way to make the bike more dinamic without having to replace this piece I would love to know.
\- Although I got the back rack, I still haven't found a way to carry my backpack. What do you guys recommend?
Last but not least:
The new bike is awesome! Love riding it, got accessories, but, since it's too heavy, I feel like it make the jod a little harder, and I don't wanna add even more weight with a rack for example, so I end up riding whith my backpack in my back, which results in a lot of weight in my back, making it harder to move around carrying the stuff I need to medical school. So, I also would like to hear from you guys if you have any ideas on how to make it more confortable to carry my stuff.
Thank you in advance!
I'm sorry if I wrote anything wrong, I'm from Brazil, so I don't write in perfect english, and I also have a limited bike vocabulary in english.
Edit¹: handlebars are ridiculous in the photos cause I was rotating it like crazy, trying to find a better position to ride. I'm gonna turn it back to the correct position soon 😂