Not the same effect. The saddle location affects pedaling position. I need to get that right before I set the cockpit length.Gasp4Air said:Some may use it to position their knees relative to the pedals, but many, like myself, use it to increase the seat to handle bar distance, aka "stretching the cockpit". Similarly, on the front end, you can use a longer stem to the same effect. (Changing stem length can also affect steering feel). I'm long legged, and I use a 1" setback post as well as a long stem. When these measures, as well as seat post height reach their limits, a larger frame may be indicated.
None. Or lots. It can be highly personal. I am much more sensitive to saddle position than I am cockpit length.smilinsteve said:My top tube is a bit short. Increasing stem length increases weight over the front. A lay back post moves weight back. These 2 variables can be used to give you the forward/back adjustment you want.
The postion of the knee over the pedal is something I haven't thought about much, but I assume there has to be some "safe zone" where you can have some adjustment without problems. After all, different seat tube angles affect your knee position and so does the length of your leg which effects the height of your seat which effects the horizontal distance the seat sits behind the bb, etc.
So, how much safety factor is there in choosing your saddle, and therefore knee, position?
The "same effect" I meant was the lengthening of the cockpit. I did mention that moving the saddle is done by some to affect pedaling, and also that changing stem length would affect steering. But I agree that it could have been expressed more clearly that changing the seat position and lengthening the stem can have additional ( and different) impacts on the bike.shiggy said:Not the same effect. The saddle location affects pedaling position. I need to get that right before I set the cockpit length.
Even if you do not care if you get your cockpit length by changing the saddle location or the stem length, which you choice to do changes the weight distribution, which changes the handling of bike.
"The traditional method for achieving horizontal saddle position is to position the rider's saddle so that the bump below the knee (the tibial tuberosity) is over the pedal spindle with the crank horizontal to the ground. I'll call this the "KOPS" (Knee Over the Pedal Spindle) method (see Figure 1).kiwimtbr said:So can someone explain to me the way to check for fit ie knee position to bb etc