How many calories do you burn on a bicycle ride?

best spinning bike with power meter image

The Oracle

I am amazed at the controversy over this, wondering what others think. Crank power output meters only measure power at the crank, and do not consider a persons metabolic calorie burn (calories burnt running the body). I have a Forrunner 305 and have run it side by side with a crank power meter, and low and behold, when you add in the metabolic rate - they almost match.

Heart rate is affected by many things, but most importantly - hydration. You could get a faulty reading (high) from being under hydrated - Rule of thumb - one pinch of unrefined sea salt for every 16oz of clear water you drink (You'd be surprised how this will lower you blood pressure and heart rate - that's right - lower). You should drink in oz's 1/2 of your body weight a day (180lb person = 90oz of clear water a day - don't forget the sea salt as water by itself is a diuretic).

Any thoughts?

Sources - Years of spinning, biking and a book titled "Your Body's Many Cries For Water."

Answer
As a rule your body is only 25% effective in power output most of the calories you burn are in the form of heat, so what ever the power meter reports is not the total calories burnt, a conversion to K-Joules is a better measure of the calories used.(1 cal. = 4kj)
This site is fairly accurate, with in reason.
http://www.primusweb.com/fitnesspartner/calculat.htm

Fzr 600 voltage problem or something?

Charlie Ha

My 1992 fzr 600 has trouble with the battery or something. The battery is brand new and it dosent seem like I'm getting enough cranking power, what happens is in the morning or after the bike sits about 8 hours or so after running, it will turn over slower than it should and it dosent seem like its getting enough juice. So if I hook it to a charger it spins it over quick and dosent take but one or two rotations to fire right up. After you go to town or run the bike for 5 mins it spins the motor over fast and fires right up. I'm positive my problem lies there now and not in the valves or carbs. I went through the valves and found one tight one and I fixed that. And it helped it some but not all the way so any advice helps thanks.

Answer
Something is either draining your battery , like a direct short or faulty switch.
or
something is not charging your battery like a failed VR or stator
You can test with a cheap multi meter and google, its fun and easy

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