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700C R ride report and shimmy hunt   Message List  
Reply | Forward Message #18947 of 25040 |
A couple of weeks ago I found myself without a road bike and order a 700C R--I've decided the "P" should be dropped from the 700C model.

Last Saturday I took it out on a 50 mile ride with the local cycling club.  Between moving, new business and a young child I haven't taken many long bike rides this year.  Actually, I had taken none over 15 miles since last December.  I took the bike on an 12 mile errand a few days before the ride, just to shake it down, and everything felt fine.

I honestly expected to hurt a little more after the ride Saturday, but I had absolutely no problems.  The ride was pretty, rural, and flat, which is about the best you can get around here without driving a good distance first.  I stuck with the middle 17.5mph group and the ride was extremely easy.  No suffering, met a lot of local riders and fielded lots of questions about my "touring" bike.

I'd like to credit all the ease of the ride to my superior bike fitting skill, but the bike has been easy from the first test ride.  It has Cypres tires on it at 75psi rear and 65 front, with an M12 rack and large Berthoud handlebar bag.

On Saturday at 16-18mph the front end would shimmy a little no-handed.  Nothing too bad, not even bad enough that it kept me from riding no handed.
Here are the steps I took to eliminate the shimmy.

Removed the handlebar bag to test the bike and found the shimmy was still there, though ameliorated.
Removed a strap which I had been using to compress the bag and clear space for my knuckles while riding the flats.  This strap was very tight and ran from the decaleur mount on the bag and the tongue of the front rack.  Removing it reduced the shimmy, but it was still present.
With bag still attached by decaleur but not the strap, I tightened the headset.  The shimmy is gone.
I put the strap, which I've decided I don't need, back on the bag and fastened it tightly to the rack just to test it out.  The shimmy was still gone.  I think it was my headset the entire time with the front load and tight fastening of the load exacerbating the problem.

I'll post some pics of the bike when it is finished.

Anthony

--
Longleaf Bicycles
805 B North Fourth St..
Wilmington, North Carolina 28401
910.341.3049 p
910.341.3059 f
longleafbicycles.com



Tue Jul 1, 2008 3:02 pm

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Message #18947 of 25040 |
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A couple of weeks ago I found myself without a road bike and order a 700C R--I've decided the "P" should be dropped from the 700C model. Last Saturday I took...
Longleaf Bicycles
longleafbicy...
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Jul 1, 2008
3:03 pm

... Maybe, but I'm wondering whether at 73.6 the HT angle is tight. The Surly LHTs and Crosschecks are 72's. The Surly track bike (Steamroller) is 74... When...
Will
waller_will
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Jul 1, 2008
3:55 pm

I think twitchy is very much the wrong word to use here. Others here have speculated that low trail bike, front load bikes with light tubing are prone to...
Longleaf Bicycles
longleafbicy...
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Jul 1, 2008
4:17 pm

i agree with Anthony, the movement I experience is definitely not twitchy. it's more an oscillation-- very regular and pronounced, so that it's possible to...
Patrick Barber/Holly ...
bidextral
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Jul 1, 2008
5:10 pm

... Anthony, Sorry. I did not intend for the word to add emphasis. In my world, twitchy is LESS than shimmy. I used it to indicate a tendency. I happen to like...
Will
waller_will
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Jul 1, 2008
5:13 pm

... here have ... are prone ... twitchy, ... given ... I generally agree. Twitchy isn't the right description. I'd be more inclined to describe the handling...
Jim Gourgoutis
jim.gourgoutis
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Jul 1, 2008
5:31 pm

... What do Surly frames have to do with Kogswells -- that's an apples-to-oranges comparison IMHO? I don't understand your line of reasoning here...? -Jim G...
Jim Gourgoutis
jim.gourgoutis
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Jul 1, 2008
5:08 pm

... My line of reasoning isn't far fetched... both brands market good bikes with similar philosophies: intelligent general purpose design, use of racks,...
Will
waller_will
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Jul 1, 2008
6:13 pm

... OK, that makes sense. The fact that you were discussing head angles among various Surly models wasn't at first apparent to me from your previous post. I...
Jim Gourgoutis
jim.gourgoutis
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Jul 1, 2008
6:43 pm

... 700C ... Anthony, do you think the "P" should be dropped because of this shimmy issue, or is there some other reason? Personally, I really liked the...
Jim Gourgoutis
jim.gourgoutis
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Jul 1, 2008
5:19 pm

... As far as I understand, 700C was not used for porteur bikes. I don't think 700C works well for the size tires porteurs used. So you'd recommend tightening...
Longleaf Bicycles
longleafbicy...
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Jul 1, 2008
5:51 pm

I posted over on the iBOB list, mentioning that here on the KOG list we've been discussing low trail and shimmy. I wanted to generate some additional...
Jim Gourgoutis
jim.gourgoutis
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Jul 1, 2008
6:49 pm

On Tue, Jul 1, 2008 at 8:02 AM, Longleaf Bicycles ... I have also observed on my sports-touring bikes that tightening the headset would reduce or eliminate...
james black
jamesjamesblack
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Jul 2, 2008
4:54 am

[For archival purposes, see also this thread: http://sports.groups.yahoo.com/group/KOG/message/18914] Over the weekend, I experimented a bit to try to...
Jim Gourgoutis
jim.gourgoutis
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Jul 7, 2008
7:09 pm

Do you use the same wheels for both bikes? I wonder how much a marginally out-of-true wheel contributes to shimmy? Matthew...
Kogswell Cycles
kogswellreader
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Jul 7, 2008
7:13 pm

... I swapped the front wheel on the P/R with another one from a different bike, and it didn't make much difference. All the wheels in question are true...
Jim Gourgoutis
jim.gourgoutis
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Jul 7, 2008
9:19 pm
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