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Alwayts make sure to get a tune-up every once in a while. Lie your bike down on its side. Spin both wheels, and make sure there is no scraping sound. This means your brakes are too tight, which may slow you down significantly. Also oil your bike occasionally, you don't need to do it that much. DO NOT USE WD-40 ON YOUR BIKE CHAIN!!! THAT WILL DAMAGE IT!!! Just buy a small bottle of bike oil from a local shop.
Ok, now that's over with.





































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http://www.beginnertriathlete.com/cms/article-detail.asp?articleid=1030
The highest gear is not always the best. For example, you start off in a car in first gear because you have more power (at a highh RPM). You don't start off in 3dr or 5th gear because you can't get enough power at such a low speed. I'v passed a cyclist many a time only because I was "spinning" and the other one was "pounding a big gear". It's also more efficient energy-wise. Also, getting out of the saddle increases your heart rate by about 8%, which means you get tired faster.
Another important thing is nutrition and hydration. On rides longer than an hour it's good to consome about half a quart to a quart of liquid and about 300 to 350 Kcal/hour, because through pedaling constantly you glycogen stores run out (in about an hour) and then you can start to feel light headded, dizzy, can't focus well etc. This is called the "bonk" in cycling. It can be even worse, depending on your output.
Here' a link to a professionally studied way to fit a road bike to one's body.
http://www.coachcarl.com/training_articles/bike_fit.htm
Knowing things like these have done me tons of good in my cycling technique.
One the bike I use clipless pedals (Shimano SPD sh 50-52) and Shimano SPD shoes rigid soles sre best for hardcore riding (no walking. They're worse than high heels). I would not go back to ordinary pedals for anything now! I love these.
You might find it helpfull, also, to google heart rate (HR) zones.
Have a great ride,
John
Basically, if you DON'T want something to be greasy you can spray some WD40 on it. It will dissolve the grease, and the WD40 itself will come off easily. (A lot of it will evaporate!)
Because WD40 is itself an oil, it's also handy for things you need to be temporarily oiled up. (A stuck bolt, for example.)
It's absolutely not to be used on things that are supposed to *stay greasy* like a bike chain.
So, To sum up : it won't dirrectly damage the chain, but it will remove any existing grease and dry up far too fast.
Chain lubrication really is a controversial topic among bike mechanics, if you really are interested this is a good place to start looking and one well qualified opinion.
branded chainlube will sometimes be your best option but non bike specific lubes can also do a fine job, depending on the conditions
solvent a simple Google search of wd40 and bike will yield much better information than your link
However I must take issue with your use of the word better. A google search will give you more information, but unless we can digest a large amount of sometimes conflicting detail, and then verify the sources from where it comes, then a short, clear article from Jobst Brandt, one of the most respected and best qualified writers on bicycle mechanics is clearly superior.
The main ingredient of WD-40 is solvent, although I am not sure that we can deduce from that that it "mainly degreases" any more than we can take the fact that an espresso has water as its main ingredient and then deduce that it will mainly hydrate the drinker.
The solvent will serve to degrease & clean but will also carry the lubricant between the individual chain parts (where it is needed).
If WD-40 is sprayed on to a dry surface it will leave a significant oily, lubricating residue, in this case it has not acted in any way as a degreaser. If it is sprayed on to a very oily surface the net effect may be slightly less oil, but I would suggest that is no bad thing when applied to a cycle chain.
I am a trained, qualified & experienced bike mechanic, however I have no qualification whatever regarding chemistry, and so when talking about WD-40 or other lubes I put forward these comments as loosely held opinion and points for discussion, please don't take them as gospel.