What seat tube angle?
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What seat tube angle?
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
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
#2
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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.
Working from a Picture ? Table is Level ?, get a transparent plastic Protractor and figure it out.
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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?
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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?
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from the picture, it doesn't look slack. Measure it
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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
Last edited by Sam12345; 09-17-15 at 03:25 PM.
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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.
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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.
#10
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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?
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?
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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?
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?
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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
#13
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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.
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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.
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Moved to Bike Fitting from Framebuilding.
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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.
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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.
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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.
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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.
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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
What I also notice is slacker angles, make me pedal more with a flat foot. Opposite to TT bike which most pedal toe down
Last edited by Sam12345; 09-18-15 at 02:34 PM.
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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.
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.
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some reason it wont let me post just the video link need more characters... Video: Videeoo::: https://www.dailymotion.com/video/x3771ad