Not done one of these in a while so here goes: if you think your bicycle is a bit too tough to ride as per effort, here's some pointers. This is obviously aimed at people new to bicycling to give you some idea of what's worth to do and what not.
The "average" human (heavy air quotes on this one due to the range of humans) can continously put out 100 Watts on a bicycle for an hour with generally no problems to give you some scale here.
I'm assuming here you don't actually want to buy a new bike.
Free or Nearly Free
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Put air in your tyres. Range of TPI or Bar is printed on the sidewall somewhere, generally the higher the easier to ride but it does get bumpier. Don't eyeball it except on thick MTB tyres you don't use for any kind of sport, get something with a manometer. This is basically impossible to calculate in watts on account of it changes heavily with road surface, i.e. lower tyre pressure might be faster on shitty roads.
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clean and oil your chain. Like just wipe it with a rag and then use some bicycle chain lubricant (maybe 8 eurodollars a bottle, so about 0,02 per oil application) - this can mean a difference of 10 - 20 Watts
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Change your position on the bike. Aero is big for bicycles, if you can assume a more streamlined position there might be a another 10 - 20 Watts in there. Just change your bars, it's a few screws and maybe 10 eurodollars for a new one that gets you a bit lower
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dial in your saddle height. Just play around with it, just make sure your leg is never fully extended or you might wreck your joints. This can be another 10 Watts (more if your current position is just absolute dogshit)
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if you have a a 2x or 3x in the front, maybe take a look at what gears you're using and how hard they crosschain. The closer you get to straight the more efficient it is. Watt savings can be up to 5 Watt with few differences in how it rides since 2x or 3x often have the same gear ratios for multiple gears.
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Unmount shit you don't need. This is kind of case by case and might not be worth the hassle if you do use it occasionally, but between carrying an air pump, a rear rack that sees usage once a year, a fixing kit that sees useage twice a year you may be getting like half a kilo of weight off there for no cost.
Worth it for some money
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New Tyres with lower rolling resistance. You can find good tyres, where I am, for ~30 eurodollars if you can get them on sale. Depending on what you have now this can be a 10 to 30 Watt difference.
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Wheel replacements. This can be a bit of work scouring your local online used market, but you can semi regularly find generally good bikes that have quite good rims but are otherwise in a state of horrid disrepair for quite cheap. Most wheel bearings for rims are closed, which means you really have to try to fuck them up bad. Could be another 10 Watts for 50 eurodollars or so.
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getting new pedals - a lot of mosey on around town bicycles seem to come up with plastic pedals with rubber grippads that have last had friction two decades ago. Change these out for some basic metal pedals with pins - it feels way better to ride and due to less of your motion going into slipsliding across the pedals you could get around 5 Watts.
Do not
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Swapping parts out for lightweight stuff. If it saves actual weight it costs a gajillion dollars, otherwise losing a kilogram of your weight (unless medically inadvisable) is probably cheaper and worth more
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Drillium, for obvious reasons
Hey @7bicycles@hexbear.net, while you're here, I've got a question for you. My brother and I are preparing to go out on our first ride of the season (road cycling on a rail trail, 20+ miles if everything works out). It's supposed to be 48 degrees F (8 C) and sunny. I've got a cycling bib and an athletic tee-shirt, but I haven't tried them out in temperatures this low yet. What do you think would win? The exertion from exercise warming me up, or the wind chill cooling me down? (I won't hold it against you if you get it wrong :P). I'd like to avoid wearing long sleeves (cotton is all I have) or a windbreaker if I can avoid it.
To add to what the others have said: an old road cycling hack is bring a newspaper or something to put flat on your chest if it gets too chilly. Does a reasonably good job at blocking wind.
Also toes can get rather cold. Some of this can be alleviated by just moving them on the bike, cheapest hack otherwise is just plastic bag over shoe
Wind chill will win on your ears/arms because they're not working. Bring coverage for your upper body and a pack so you can take it off if needed, but in all likelihood your legs will be plenty warm!
This makes a lot of sense, thanks.
o7
I forgot to mention you're probably good with shorts. But it doesn't hurt to have some coverage you can take off once you're warmed up.
Wind will impact your hands first. Wear gloves that block wind. They do not need to be waterproof or particularly padded, it's really just the wind. They don't have to block 100% of the wind but their wind blockiness will be what keeps your hands comfortable. Under no circumstances do they need to be "cycling gloves".
Edit: same for upper body. Cyclists use gilets to block wind they don't do anything else really. You don't need a gilet, just apply the same principle: block wind. Note that you also need ventilation to prevent becoming a wet sweaty uncomfortable person. Sometimes just wearing a fleece that zips at least half way down balances everything out. Or a flannel that unbuttons.