's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )

New Easton CT2 Seatpost clamp design?(8 posts)

New Easton CT2 Seatpost clamp design?montagner
May 31, 2002 7:30 AM
Has anyone seen the new PerformanceBike catalog? They show the Easton CT posts with different seat clamps.

Is this a new design? I don't see it on the Easton website. I may call Performance to confirm.
re: New Easton CT2 Seatpost clamp design?Ian
May 31, 2002 8:16 AM
Yup, new design. Probably won't be available for another 2 months or so.

Can you say UGLY! nmNessism
May 31, 2002 8:59 AM
What's with all the setback?JS
May 31, 2002 1:50 PM
About an inch more than most other layback style posts, why? It effectivley turns you 73° seat tube into a 70°, again, why?
May 31, 2002 3:36 PM
Some people like to sit MORE behind the BB. I am 85mm behind the BB to maximise push while climbing and general riding.

I have tried sitting more over the BB, pushing down but I make more power (measured with Powertap) both on the trainer and on the road when my hamstrings are working in balance with my quads . Up to 20 watts difference at AT.

Most seat-posts do not offer ENOUGH set back. The fashion is for steeper frames but most average every day racers cannot handle this geometry, hence all the posts here about knee and back pains.

Pro position it may be but pros they aint. A lot of this is fashion over function.

More setback will help most people. Bars need to come up too.

What would you rather have? A pro position without the necessary flexibility or musculature or another 20 watts (or more) and less aches and pains.

May 31, 2002 4:01 PM
Seat tube angle and saddle setback are strictly a function of each riders physiology, most notably femur length. Your statements have all these absolutes in them that are just plain wrong. To say that someone can jam their seat back and gain 20 watts is a joke. read this about saddle setback, this person knows alot more than you or I.

In a nutshell, setback determines the point in the pedalstroke that the leg reaches max extension and power drops off. The more setback you use, the more power drops off ahead of 6 O'clock and the more you isolate to the quad, and the more you lose your ham and calf in the pedalstroke. Less setback means a longer powerstroke with more ham and calf, but less mash from the quad.
Without forming a discertation, the plumb-bob rule is derived from the fact that with the pedal at 3 O'clock your thigh bone (femur) and crankarm are both at their greatest length in relation to gravity. When you drop the PB from this point you coincide the two levers for maximum leverage (which is always relative to gravity). In other words, your biggest boost from gravity comes when you align the tibial tuberosity (bump below kneecap) with the pedal axle. You gain or lose efficiencies from different muscle groups by varying from that point, but you definitely lose the help of gravity.
By the way, that whole perpendicular pedal torque theory is crap. No-one can pedal with torque perpendicular to the pedal except for a very few degress. You know who you are.
Mass formulas are not individualLeGrimper
Jun 1, 2002 11:55 PM
20 watts, count them. No joke. Irrespective of whoever wrote the above.......

We wont agree on this and fair enough. Ive played with this one extensively and come to my own conclusions. A lot of the formula stuff does not work or is just a good starting point. Same with seat height as inseam times 0.65.

What about if you have a leg length difference? or drop your heels under load? Maybe you point your toes? What if you have shoe size differences?

More setback ensures more pull as well as push from 11o/c to 7 o/c. From above its only 12 o/c to 6 o/c all quads with 6 dead hours in the stroke.

I can only tell you what I have found out. More setback is a good thing not bad. Hence the handful of good seatposts out there.

I have 40 pages of very enlightening reading here I will happily photocopy and post to you FOC JS. Drop me a line and I'll send it to you. If you read it and find nothing in it youve lost nothing only me and the photocopier. However maybe youll find 20 watts buried somewhere in the pages.

You’ve nothing to lose.

re: New Easton CT2 Seatpost clamp design?JimP
Jun 3, 2002 10:09 AM
Yes, the new seatpost has a "different" look about it. Easton must have been listening to all of the complaints about the problems of keeping the seatbolts tight enough and changed the design. I had 2 different CT2 posts and found the seat binder bolts had to be tightened very carefully or the seat would slip.