Everyone ought to be able to spot their own weakest link. For example, if you ride an old '93 aluminum GT with 8 sp Dura Ace, then probably the frame or perhaps the wheels. More often than not, it's gonna be one of those two things.
little upgrades that have made me the happiest (assuming you bought a bike which fits and has a seat that you like):
1) Tacx tao bottle cages ... my first cages were hard to use and rattled.
2) 25mm tire on the rear (alloy frame) to soften the ride a tad (I'm around 190 - 200 lbs).
3) Skewers with internal cams (ie Shimano and some others), as I find the action much smoother and more pleasant to use than the ones with a cam'ed lever and curved washer.
4) Avid roller-magic (onto shimano DA7700 rear deraileur), lowers the lever force for shifting ... not super pretty, but def improvement in shifting ... $US10
So, yeah, if you're talking about big money, then frame, wheels, carbon bars, carbon post etc, but if not ...
anything that gets you out on the bike more........It could be something as simple as new bar tape........At the end of the day, it's all about riding...lots......that will outweigh any upgrade you make to the bike..
Wheels that are appropriate for your weight and style of riding. The bonus with wheels is that you can transfer them to just about any frame that you decide to get in the future or if you want to demo a new bike, do it with your own wheels.
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