best spinning bike with power meter image
jacob m
I am in the market to buy a new crank for my road bike but i am not sure on what size to get. Can anyone give me some tips?
Answer
Hmmm....... I was under the impression that Dura ace was available in sizes from 165 - 180mm in 2.5mm increments. (But I've been wrong before.)
http://cycle.shimano-eu.com/catalog/cycl...
Assuming you are talking road bikes (Dura Ace cranks) Here is a rough guide.
Most road bikes sized up to 54 cm use 170 mm cranks
54 - 58 cm use 172.5 mm 58 cm or greater use 175 mm. This is usually close enough for most people.
Getting the BEST size for you is a bit trickier. The best way is to measure your output with a power meter. (power v heart rate)
If you aren't prepared to go to that trouble. Here is a formula that is somewhere in between.
Start with 10% of your height. (round down, this assumes stocky build, a touch long)
Then make adjustments for the style and type of riding that you are doing.
subtract 2.5mm for lean build. or if you prefer to spin
subtract 2.5mm to 5mm
if you are female (longer thigh to shin ratio)
for track racing (better acceleration)
if you have frequent knee problems (less knee bend)
add 2.5mm
for time trials
hilly rides
if you prefer to mash
add 2.5 to 5mm
pure hill climbs
(and MTB races)
(Out of the saddle you can get away with a much longer cranks since body movement reduces knee bend)
P.s. Looks like MR has the downthumb troll. Where's mine?
Hmmm....... I was under the impression that Dura ace was available in sizes from 165 - 180mm in 2.5mm increments. (But I've been wrong before.)
http://cycle.shimano-eu.com/catalog/cycl...
Assuming you are talking road bikes (Dura Ace cranks) Here is a rough guide.
Most road bikes sized up to 54 cm use 170 mm cranks
54 - 58 cm use 172.5 mm 58 cm or greater use 175 mm. This is usually close enough for most people.
Getting the BEST size for you is a bit trickier. The best way is to measure your output with a power meter. (power v heart rate)
If you aren't prepared to go to that trouble. Here is a formula that is somewhere in between.
Start with 10% of your height. (round down, this assumes stocky build, a touch long)
Then make adjustments for the style and type of riding that you are doing.
subtract 2.5mm for lean build. or if you prefer to spin
subtract 2.5mm to 5mm
if you are female (longer thigh to shin ratio)
for track racing (better acceleration)
if you have frequent knee problems (less knee bend)
add 2.5mm
for time trials
hilly rides
if you prefer to mash
add 2.5 to 5mm
pure hill climbs
(and MTB races)
(Out of the saddle you can get away with a much longer cranks since body movement reduces knee bend)
P.s. Looks like MR has the downthumb troll. Where's mine?
In cycling/spinning (on a stationary bike), what's the difference between RPM and watts?
razzb
I want to convert RPM to watts - is this possible?
Answer
RPM (Revolutions per minute) refers to how fast the wheel is turning.
Watt is a unit of power generated , or consumed by the a system. It can be expressed in calories, BTU's (British thermal units) ,or even horsepower. The electric meter in your house measures how many watts are being consumed per hour by your appliances ,or energy consumption.
Since there is an a direct correlation between how fast the wheel spins, and how much energy it takes to sustain the elevated speed, you could make a rough index of consumption at different RPM's. That is not called a conversion, it is just a comparative estimate.
RPM (Revolutions per minute) refers to how fast the wheel is turning.
Watt is a unit of power generated , or consumed by the a system. It can be expressed in calories, BTU's (British thermal units) ,or even horsepower. The electric meter in your house measures how many watts are being consumed per hour by your appliances ,or energy consumption.
Since there is an a direct correlation between how fast the wheel spins, and how much energy it takes to sustain the elevated speed, you could make a rough index of consumption at different RPM's. That is not called a conversion, it is just a comparative estimate.
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