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76 vs 78 degree seat angles

mdd's picture
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started by mdd on December 27, 2006

There has been alot of talk lately over at slowtwitch about 76 degree vs 78 degree seat angles on tri bikes and even discussion about there being 78.5 angle models coming out this year.

What does everyone over here think? Does anyone ride at the more extreme 78 or higher degree and if so do you think it makes a real difference? The claims at slowtwitch are that 78 and 78.5 degree angles are going to become the new tri bike standard which will allow people to of course ride even steeper (80 degrees+) with some modificiation.

Thoughts?

kylie's picture
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kylie posted 1 year ago.

no thoughts, but also curious :)

From what I have heard, the angle of any bike can be adjusted by how your seat is placed, too...

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glbrum's picture
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glbrum posted 1 year ago.

I have a Plasma which is set up at 76 degrees but with the seat all the way up on the rails, it sits at 79.5 degrees. All I know is that the steeper the angle the more able I am to run better off the bike. Case in point: I ran 43 off the bike in 05 and 41 off the bike in 06 (same course, very similar conditions).

ironmike12's picture
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ironmike12 posted 1 year ago.

do you think the 2 minutes you saved on the run could have been from improved fitness?

glbrum's picture
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glbrum posted 1 year ago.

I hadn't run (litterally) for 4 months prior to the race due to injury

so the answer to your question is no

kylie's picture
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kylie posted 1 year ago.

glbrum -- it looks like you are arguing that the seat angle is what made the difference... what was your seat angle each of those years?

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glbrum's picture
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glbrum posted 1 year ago.

I believe in 05 I was on a road with as forward a position as I could get. I think it was 75 degrees.

In 06 I was on a tri bike with something in the neighborhood of a 78-79 degree seat angle.

Levoe210's picture
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Levoe210 posted 1 year ago.

with the steeper angles, whether u slide the seat all the way forward or steeper tube or both, arent you getting your knee further over the pedal axle and beating up on your knees more?

deepbluex's picture
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deepbluex posted 1 year ago.

I tend to prefer a steeper seat angle as an issue of comfort which leads to greater performance. I just feel very comfortable at the steeper angles when it comes to aero position. I am currently riding a 78Deg frame with the seatpost flipped around and the seat brought forward so that I am probably sitting at an even stepper angle than 78.

Pete L.'s picture
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Pete L. posted 1 year ago.

glbrum;59124 wrote:
I have a Plasma...

I've been thinking about getting a Plasma, how do you like it?

Triguy98's picture
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Triguy98 posted 1 year ago.

Levoe210;59674 wrote:
with the steeper angles, whether u slide the seat all the way forward or steeper tube or both, arent you getting your knee further over the pedal axle and beating up on your knees more?

No. Knee injuries usually occur as a reult of poor alignment, over extension, or heavy prolonged gear grinding.

The old KOPS (Knee Over Pedal Spindle) standard has been disproven and thrown out the window.

Life is short. Play hard and get dirty doing it.

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UFTriGator posted 1 year ago.

Pete L.;60277 wrote:
I've been thinking about getting a Plasma, how do you like it?

I got one a few months ago. Haven't raced it yet, but it's very fast and very comfortable. I was deciding between that and a new Felt B2 (the new FSA Krono crankset was so cool!), but a very fast friend recommended the Plasma, since she's ridden both. Scott is one of the only companies that does carbon welding of multiple pieces instead of monocoque frames, meaning that they can make different parts of the bike in different thicknesses, i.e., thinner (read: lighter) tubing in non-load-bearing areas. I got the 105 version from my sponsor shop, and it seems a little expensive for how it's spec'd, but upgrading the handlebars, aero bars, etc. shouldn't be too bad. I put on a Profile flatwing with T2+'s and Vision levers. Other than that, I find that the 105 components work fine.....not doing any crits on it anytime soon! As long as everything is put together well and properly maintained, it should be great. Of course, if you want to splurge and get the Pro model or Ltd, the bike would be pretty sick, too!

Some people complain about the top tube being too wide and bumping their knees, but I've never had any problems. I'm guessing that they're just knock-kneed!

One thing to be careful of though.....it's a pain in the ass to travel with. Because of the integrated seattube, you'll have to take apart the cranks to fit it into a box to take on a plane (needs special tools and some time).

Summing up....had it a few months and can't wait to race on it in March! Feels super fast!

Just

______________________________________________
-Matt
Not fast enough.

Pete L.'s picture
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Pete L. posted 1 year ago.

I think I'll probably get one. It sounds like a good frame. Light and fast.