Schwinn Discover Hybrid Bike Unisex 21-Speed 16 Inch

Look elsewhere - I will have replaced nearly every part but the frame and I've had it less than three months. I am a 58yr-old man, 6' tall and weigh about 290 - all muscle, strong as a slightly-chubby, older bull. The Schwinn Discover Hybrid that I bought on December 21, 2018, came with 700c wheels, and it is a bit high for me, but I am able to stand with the middle bar almost touching my boys (about 33" from ground to bar). When first riding, I felt I was forced to lean too far forward and my upper body was quickly fatigued and so I replaced the handlebar with one that let me sit more upright. The front and rear derailleurs both needed multiple adjustments, and they were fine for awhile, but now they need constant adjustments. I am considering replacing the twist shifters with trigger shifters, hoping that will solve this strange problem, but I'll probably end up replacing both derailleurs as well. Update after 400 miles - the chainring assembly (the front three sprockets) wobbles and I can't find info on how to tighten or replace. It appears to be a problem without a solution and I'm beginning to consider replacing the entire crankset. The pedals were razor-sharp spiked pedals-from-hell. I replaced the pedals with those old, slippery, non-lethal kind. PROS: Price at $310 was less than most in this quality range, fairly stable and sturdy overall, spring-loaded fork and seat (but these spring-loaded suspensions are not much of a "pro" - the seat suspension tension adjusts but the forks don't) CONS: low quality tires, deadly razor-spike pedals-from-hell, crap brakes --- replaced pedals, seat, handlebars and brake pads --- plan on replacing twist shifts with trigger shifts, plan on replacing crap brakes with disc brakes ... but I may end up replace this dumpy bike with something better before I replace all the low-quality parts that this bike came with. * Seat replacement * this bike comes with a seat that has a specialized assembly bracket at the top of the spring-loaded seat stem, not the standard round shaft adapter, and this required me to remove the assembly components that came with the new seat in order to use the bracket and assembly parts that came with the original seat. Near-standard fit, it seems. The Promax alloy linear pull brakes, or V-brakes, are difficult to adjust, and the brake contact material is wearing rapidly (though I admit I am a well-muscled person). I've really had it with these crap brakes and am planning on replacing them with disc brakes. The tires are flimsy and both were replaced within a few rides due to getting multiple punctured tubes front and back because the tire thickness allowed tiny objects like plant seeds and small bits of broken glass to puncture the tubes. The seat was too stiff and slender and so I purchased a Cloud9. The handlebar stem is THREADLESS, not quill, which means it uses neck shims (small, stacked cylinders) to adjust handlebar height and it shipped with the maximum height of 3 shims (about 1" of stem height adjustment). I think the threadless stem system is really stupid because there is no way to simply raise the handlebars several inches, but if you want more height with a threadless system it is my understanding that you must replace the entire neck assembly with a longer one that allows this type of modification. And so there was no way to raise the handlebars enough to allow me to ride in a more comfortable position. I also adjusted the handlebars using the 30 degree rotation of the handlebar stem clamp, but this only added about an inch of height and so I purchased a truly swept-back handlebar from Walmart (through a 3rd party vendor), which also required the purchase of a small handlebar half-cylinder-shim in order to obtain complete tightening of the neck clamp. The handlebar grips that shipped with the bike are very stiff and so I also purchased soft, cushioned grips. I've been riding the bike almost every day for about six weeks now, and other than replacing the tires, handlebars and pedals, everything has been functioning really, really well. I will probably replace the twist-shifter with a trigger shift-brake handle combination soon, since the twisting is getting annoying, especially the 3 front gears, which require about a full one-inch rotational twisting motion of the left hand, bending the left wrist awkwardly backward, which takes five clicks to switch from first to second on the front gears, but only another two clicks to go to the third, largest front gear. The rear gears are awesome after some adjustment, except for the twisting of course. I really don't understand why I was unable to find a decent bike with disc brakes in this price range, and the problem with the handlebar neck having almost no height adjustment just blows my mind. The sharp, protruding edges of the original pedals-from-hell seems like they must have been made for people who are always wearing thick, plastic lower-leg protectors for some sport that involves opponents constantly kicking each other in the lower legs, and I feel like those pedals should never be allowed near people for any reason. I have a feeling that these types of dangerous and low-quality parts are being auctioned around among a group of unwanted-parts dealers. I guess I didn't return this bike because I reasoned that it had been so long (about fifteen years) since I last purchased an inexpensive Giant hybrid, that there were bound to be many significant changes, and most bikes were probably going to require many of these types of modifications. I felt like I would probably have to make many modifications to whatever bike I bought. Can't understand why Giant brand bikes are so expensive now. They're really just "good" quality bikes, not anything incredible. If I can get the wobble out of the chainring assembly without replacing the entire crankset, then I might keep this Schwinn, otherwise I would consider anything Schwinn makes from here on out to be mostly junk. And shame on Schwinn for putting together a bike full of crappy parts.