Originally Posted by BlazingPedals
I'd say an upright rider can put way more force on a chain than a bent rider can. In fact, I've broken chains on uprights but never on a bent. Those of you who claim they can do 400-600 pounds (or more) in a leg press, can you do it with ONE LEG (one pedal at a time?) I can't. Standing and pulling on the bars can exert not only a huge force, but it can instantaneously be much higher than someone spinning while seated.
Sorry, still beg to differ. You CAN exert more force from most 'bent seats than on a DF. Way more. The operative statement above "it can instantaneously be much higher" is what can cause chain failure on a DF. A 'bent rider has a much harder time making that instantanious pressure due to the seating position. Not impossible, just harder to do.
As for DF pedal pressure, gravity is the rule. Pull up HARD on the bars while you are pedaling and you add about 10 % of your body weight to the pedal pressure. 170 lb rider + 10% = 187 lbs pedal pressure. Yes, I can leg press over 300 lbs with ONE leg. (thanks to years of rollerskating perhaps) Titanium pedals are an example of a materials strength. You can put lots of pressure on the pedal without it failing. But, strike that pedal with a hammer (or hit it on the ground while pedaling through a corner) and it will shatter almost like glass. (instantanious pressure)
So try again to convince me that you can put more (non instantanious) pressure on a DF pedal than on a 'bent pedal.
Cheers,
Dr. D