Sam12345

Hi does anyone happen to know what seat tube angle this frame is?

It is a giant cadex

At the current setup I feel like I am pulling up too much. pedaling from behind the bike.. I am 6ft 3, with good forward pelvic rotation, which pulls my knee back even more I still need to play with more reach and to drop 2 spacers. Then perhaps move the saddle forward 2cm to prevent pulling up, on a different seatpost

https://gyazo.com/4e2715f6f0981a177f89507b164df001

fietsbob

NB: you can get an Angle Finder at the Hardware store.

Working from a Picture ? Table is Level ?, get a transparent plastic Protractor and figure it out.

unterhausen

do you have an smart phone? There are angle finder apps that work pretty well. I think you need to see someone to help you fit your bike, that's already a really radically forward position. Don't you have problems with your hands on longer rides? Like anything over 100 feet?

Sam12345

Yes I have a smart phone. Nope I pass the balance test... I believe the frame is slack, so saddle needs to be more forward, to get properly rotated over the BB.. Torqe is usually wasted to early in the stroke when too far back. Combined with forward rotated pelvis that pulls the knee back

unterhausen

from the picture, it doesn't look slack. Measure it

Canaboo

bottom line is you can't change it. Just move the saddle forward and see if you get the right position without being right at the back of the rails.

Sam12345

If I moved the saddle back and my pelvis rotates forward along with it, then that pulls my knee back twice the amount. I start pushing around 10oclock in the pedal stroke with that current setup

Try this pick something up off the floor, your back goes back but so does your knees, forward pelvic rotation can prevent you from pushing straight down if the saddle isn't moved to compensate

Check out the giant alpecine bikes, slack angles with saddle far forward, if they moved saddles back and pelvis rotates forward they would be peddling from behind the bike which is wasted energy

Canaboo

I said forward, not back. I really don't think the body knows anything about the angle of the seat tube. All that really matters is where you are in the saddle.

unterhausen

the saddle is all the way forward on a zero setback seat post. My first hypothisis is that you are rotated forward, and the balance test doesn't really work because you have good core strength. My second is that you have incredibly short thighs.

McBTC

Nothing scientific here but you do have a loooong stem and if you shorten it you'd move your seat back to maintain your current posture. For a basic idea as to about where the saddle ought to be consider dropping a plumb line from just below you knee cap and see where it lies in relation to the pedal spindle when in the forward position (3 o'clock).

You're usually looking for the plumb line to be about in line or perhaps a little behind axle of the pedal. The placement of your foot on the pedal and the length of the crank arms are additional related factors to look at (although it a lot more difficult to experiment with a shorter crank length than a shorter stem and moving the saddle and feet around with respect to the pedals).

Are those cranks 175s or 180s?

Sam12345

170s. I was thinking off putting a 3t 140cm stem on with -17degree angle I cannot remove the 2 spacers atm due it being a Ahead adapter may struggle to cut thread down the current stem on there is 130, with 6degree angle

Sam12345

I will upload a video off my fit tomorrow. Here or some videos of fits that haven't worked lol

https://www.dailymotion.com/user/samokoko/1

McBTC

Okay, you're talking about a longer stem and perhaps a more aggressive riding posture by dropping the stem down on the steer tube by moving some spacers to the top of a more negatively angled stem? I think you're looking at turning your road bike into more of a tri-bike. If so, you might check out an Adamo saddle as it made for a more forward position on the saddle itself and probably will help you to put your knees, in front of the pedal spindle.

Andrew R Stewart 

I see a second bike off to the side. Is it the OP's? Does it fit/feel better? Can it be used as a template for transferring the fit data points to the Giant? Andy.

Canaboo

I see that now on a larger screen. So it seems the only option is a steeper ST angle short of a fast forward seatpost.

CbadRider

Moved to Bike Fitting from Framebuilding.

Carbonfiberboy 

Nice photo. Putting a protractor on the screen, it looks like 73°. IMO you look scrunched forward. I'd move the saddle back until, with your hands on the hoods and your forearms horizontal, your elbows are just barely in front of your knees.

jyl

I think the frame is too small for you. Which is causing you to use a very long stem, plus a lot of spacer to raise the stem despite you clearly having a lot of flexibility. With your leg length, you'd normally use longer cranks, not 170 mm. That said, I don't understand why it feels better to you to have the saddle so far forward, so a picture of you on the bike would help.

Carbonfiberboy 

He posted a link to a whole pile of videos of him on the bike in post #12 . The videos are about what you expect.

Sam12345

Video

https://www.dailymotion.com/video/x3771ad

Sam12345

IF anything I feel I need to remove spacers

cale

71.5 degrees using PS protractor.

Sam12345

Riding at 82cm saddle height in that video, I feel like im pulling up too much, which indicates Im riding to slack, too far back.. Hard to get over the pedal stroke.. Its 6-7cm behind the BB already too... Could it be that my saddle is too high which is making me pull? If I moved the saddle more forward I'd def need to drop spacers and get a longer stem

What I also notice is slacker angles, make me pedal more with a flat foot. Opposite to TT bike which most pedal toe down

cale

Hard to say without seeing you on the bike but I was struck by how high you've positioned the seat. That'd give me a nose bleed.

I like a good bit of bend in my knee when I am a dead-bottom on the pedal stroke. That's with my heal down, foot horizontal to the floor (my typical riding position is slightly toes down).

25 years ago I could have ridden a bike with the seat position in stark contrast to the handlebar position but I couldn't do that for long any more.

Sam12345

some reason it wont let me post just the video link need more characters... Video: Videeoo::: https://www.dailymotion.com/video/x3771ad