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Steerer/stem/handlebar flex(8 posts)

Steerer/stem/handlebar flexjaybird
Jul 8, 2002 11:43 AM
I just built up a shiny new Look KG381i and on its inaugural ride I noticed a bit more flex than I am used to in the steerer/stem/handlebar. I have it set with 20cm of spacers below the stem and 5cm above. It doesnt feel bad just different. I am used to a steel frame with a threaded headset and quill stem. Is this normal? I am a pretty big guy (6'3" 220) with a relatively strong upper body (i was a swimmer in college) so I tend to use more of my upper body than I probably should.

whadya think?
re: Steerer/stem/handlebar flexSantaCruz
Jul 8, 2002 12:55 PM
Are you sure you have 20 cm of spacers between the top of the headset and the bottom of the stem, that's almost 8 inches!!
What do you have for a bar and stem?n.m.koala
Jul 8, 2002 1:33 PM
I guess it's the frame (?)Markus_B
Jul 8, 2002 1:22 PM
I think 2 cm (20 = typing error?) spacers don't make the difference. The 5 above don't matter (must look strange - you will remove them some day?).

According to some comparative measurements done by magazines, the beautiful KG381i is not the stiffest frame. Although lightwheight steel frames are neither known to be stiff.

If you have mounted usual aluminium stem and handlebar (no Ti and no superlight parts), I guess it's the frame.
what stem and bars?C-40
Jul 8, 2002 1:33 PM
If you want more stiffness, the new oversize bars and stem (31.8mm) should be considered. You should also consider reducing the amount of head tube spacers by changing the stem angle. I wouldn't use more than 5mm and prefer none if possible.

Don't blame the frame unless you know that your bar/stem and spacer combination are not the culprits.

You should also work on technique. Just because you have the size and weight to flex the bars, doesn't mean you should. You're just wasting energy if you pull too hard. Concentrate on putting the power to the pedals.
do you have carbon steerer?Qubeley
Jul 8, 2002 2:01 PM
Since you have a Look bike, I guess you have a Look fork as well. Does it have carbon steerer? If it does, 2cm of space WILL give a lot of flex. My fork has carbon steerer, and when I first set it up, I left about 1cm of spacer, and the handlebar flex so much that I felt like I am riding on cotton. Then I cut the fork all the way down, problem gone. Fortunately I was able to adapt to new position rather quichly.
I too just bought a new 381icharyne
Jul 8, 2002 2:50 PM
.......but I love it....I'm 6'1" 200....I race on it....little flex...have Easton Carbon bars and Easton EC90 Mag. stem...both are great....

FYI...I'm a big hard problems with the bike!
re: Steerer/stem/handlebar flexjaybird
Jul 9, 2002 4:30 AM
You are right, I have 20mm of spacers and I am using deda newton 26 bar and stem. I think you are also right about my technique.

I put another 25miles on it last night and I noticed that the bike seemed stiffer when I was out of the saddle climbing. When I was hammering on the flats it seemed a little squirrely. Now I am wondering if that is because of the Ksyriums combined with a little crosswind. This is also my first time on them, all of my other wheels are just standard hubs/open pros.

Thanks for all of the input.