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Does anyone else like bikes?

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  • #16
    The less it weighs the more it costs!

    The lightest frames are about 1.8 lbs. The average frames weigh about 2.5 lbs. and cheap basic frames are about 3.3+ lbs. Carbon frames that we sell range from $1200-$15,000. As with most anything there is a point of diminishing returns. Weight is not the only selling point in a bicycle frame. Ride characteristics are more important. If a bike is flexible and inefficient it is not a good frame. If a bike is too stiff and produces a harsh ride it is also not a good frame. The best bikes for most applications have a good stiffness to weight ratio while having great pedaling efficiency while at the same time absorbing bumps in the road that would prematurely fatigue the athlete. The new trend in bikes as seen in the link that I posted above (Tony's, Vitor's and Bruno's bikes) aerodynamic frames are becoming very popular for the right application. They are wind tunnel designed/tested and between the forward lower positioning of the athlete, the aero frame and wheels, one can expect to gain approx. 2-3 mph of an advantage. In the IronMan distance (2.4 mi swim 112 mile bike and 26.2 run) triathlon races that Tony and Vitor compete in, they can expect to get off the bike approx. 30-50 minutes in front of a person with an equal quality non areo bike with a traditional cyclists positioning. The areo frames weigh more, do not absorb bumps as well and do not pedal quite as efficient. However if ones goal is to get to a speed and maintain it with out having to climb or accelerate they have a specific advantage.

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    • #17
      Thanks for all the info John. I knew there was a lot of development in the construction of the frames as far as stiffness. I didnt realize such gains could be made aerodynamically. What do you mean by how it pedals?
      The bike I like to ride most often is a bare steel frame (no paint) with brazed lugs, single speed with a coaster brake. It has chrome wheels 28" in the back and 26" in the front. The saddle has springs.

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      • #18
        How a bike "pedals" refers to the sensation of efficiency and feel the bike gives on the riders feet and legs as one applies pressure to the pedals. Some basic or antiquated carbon frames feel dead or not lively when pressure is put to the pedals. Better carbon frames spring back against one feet when pressure is applied. This makes you feel like the bike is a little more part of you. Kinda hard to put into words til you have ridden bikes of opposite ends of the spectrum. A nice steel performance frame weighs about 4 lbs. It is pretty flexy by comparison to most materials. Making it not a stellar material to be raced upon. However, it gives a spectacular feel to your feet as it springs back against you. It also slightly gives you the sensation that you are one with the bike. It also dampens shock better than a lot of carbon frames. On occasion I will race on my steel single speed mountain bike. In boat racing terms, it is kinda like racing a roll up runabout. It is not the most efficient form to win a race. However it is more fun and if you can win with it you know you did something pretty cool. In cycling the bike can only do so much. It is more the Indian not the arrow. Lance could have probably won 5 of his 7 Tour de France titles with 30 year old bike technology. It is very difficult when using good tubes of steel to make a poor riding steel frame as long as you get the geometry right. Carbon is quite different, there is a lot of engineering to get a carbon frame to be an "a" level riding frame. Not being a carbon expert, but you may want to look at Calfee Design on what appears to be a simpler way to make a carbon frame. There frames have not changed with the times, however their lug system seems to be an easy way to bond the tubes together. I would definitely increase their tube diameter to modernize what they are doing.
        Last edited by Racers Edge; 02-17-2012, 07:18 AM. Reason: More info

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        • #19
          Two speeds

          dont pay attention to the motor, thats a future project. Follow the chain. There are two different free wheels (18T and 21T) on the rear wheel. The bike can be pedaled in either direction and still be propelled forward, but at different speeds. pedal forward for low, pedal backwards for high. Or change the chain routing for, backwards low, forwards high.

          why? why not! Its alot of fun pedaling backwards, uses different muscles.
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          Last edited by matthias; 02-19-2012, 07:03 PM.

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