best bike helmet value image
Christophe
I have a 4month old son and would like to get a seat or a trailer for my bike. what is better a trailer or seat, and what are some good models?
thank you!
Thanks for the answers so far! I guess i should have mentioned i am not looking to put him in it yet (i didn't even get the bike for myself yet) i am more so just looking to do the research and get the helpful advice from all of you.
Answer
You do not want to take an infant that young on a bike or trailer. They are not strong enough to hold their head up let alone wear a helmet. Wait until they are at least a year old. A trailer is safer then a carrier, they won't tip over if you go down. Until then you should keep you eye out for a Chariot or Burley. They are expensive but a used one is much cheaper and they hold their value longer then the cheaper brands.
http://www.ibike.org/education/infant.htm
http://www.nextag.com/baby-bike-trailer/shop-html
You do not want to take an infant that young on a bike or trailer. They are not strong enough to hold their head up let alone wear a helmet. Wait until they are at least a year old. A trailer is safer then a carrier, they won't tip over if you go down. Until then you should keep you eye out for a Chariot or Burley. They are expensive but a used one is much cheaper and they hold their value longer then the cheaper brands.
http://www.ibike.org/education/infant.htm
http://www.nextag.com/baby-bike-trailer/shop-html
How does a bike helmet help reduce the impact of a crash?
Grant
Using equations if possible, thanks. I know that it spreads the force across a larger area of your head, but what about absorbing?
Answer
A helmet reduces the impact of a crash using two methods: distributing the force over a large area and slowing down the impact.
Using the basic equation of force, Force = mass * acceleration, we can look at how these two methods reduce impact.
Force can be measured simply as total force (e.g. 100 Newtons) or quantified by force over area (e.g. Newtons per square centimeter). As a bicycle helmet spreads the force for one point to a larger area, the force/area measure is decreased. This reduces the force applied to a single area, however, the overall force applied is still the same.
Acceleration is the other part of the equation that a helmet works to minimize. Acceleration is often measured as length over time-squared (e.g. meters/second-squared). Upon impact, the helmet is designed to crush, and this process of crushing extends the amount of time involved for the head to come to a stop (or before it bounces). This increases the time value in the measure, and since the time measure is a squared value, the effects of increasing the time involved has a big impact on reducing the overall acceleration and subsequent force.
To represent the two methods used by bicycle helmets to reduce impact, it is better to rewrite the original equation of Force = mass * acceleration as force/area = mass * (distance/time^2). Now you easily see where the added area for absorbing impact, and the increased time for the impact have big impacts on the trauma experienced by the head. The mass is slightly increased by the helmet, but nowhere near makes up for the distribution of force and slower acceleration (deceleration).
A helmet reduces the impact of a crash using two methods: distributing the force over a large area and slowing down the impact.
Using the basic equation of force, Force = mass * acceleration, we can look at how these two methods reduce impact.
Force can be measured simply as total force (e.g. 100 Newtons) or quantified by force over area (e.g. Newtons per square centimeter). As a bicycle helmet spreads the force for one point to a larger area, the force/area measure is decreased. This reduces the force applied to a single area, however, the overall force applied is still the same.
Acceleration is the other part of the equation that a helmet works to minimize. Acceleration is often measured as length over time-squared (e.g. meters/second-squared). Upon impact, the helmet is designed to crush, and this process of crushing extends the amount of time involved for the head to come to a stop (or before it bounces). This increases the time value in the measure, and since the time measure is a squared value, the effects of increasing the time involved has a big impact on reducing the overall acceleration and subsequent force.
To represent the two methods used by bicycle helmets to reduce impact, it is better to rewrite the original equation of Force = mass * acceleration as force/area = mass * (distance/time^2). Now you easily see where the added area for absorbing impact, and the increased time for the impact have big impacts on the trauma experienced by the head. The mass is slightly increased by the helmet, but nowhere near makes up for the distribution of force and slower acceleration (deceleration).
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