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Rear shock position


Slowbee

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*education on*

 

The different brands have different positions that the rear shock is situated.

 

I recall when I bought my current mountain bike that it just seemed to make sense to have the shock underneath the top bar as it would absorb more of the impact.

 

But at that time the giant anthem was big on the market and I also liked the "look" and "sense" of the shock position. The "new" trance have the shocks parallel to the downtube.There was the odd position on the merida AM I think it was (could never wrap my mind around that one). Then Specialised also had the one on the rear triangle ?

 

So what affects where they place a shock on a bike? Is it the type of link (swingarm) that makes the difference to the way the impact is transferred or the actual position of the shock on the bike ?

 

*education not off yet*

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I am not going to comment on this because I don't know.

 

nor do I, so that is why I am asking :)

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It's got to do with the geometry of the suspension design/linkages and what the designers are trying to achieve.

 

Regardless of what the orientation of the shock, it still operates in a straight line.

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Are you talking about bikes with single pivot suspension or all different types?

 

umm there are types ?

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sorry, the bikes mentioned in your question answer my question...

 

this article explains different suspension types http://www.bikeradar...n-part-2-28438/

 

The type of suspension determines the linkage most of the time - which determines the shock position to some extent... but the shock position can still change depending on the exact design

 

Looking at single pivot, the shock needs to be at a right angle (tangentalish) to the lever movement

Looking at a 2 Faux bar, there are additional levers, making it possible to put the shock on the seat tube or on the top tube.

 

As to which is best, dont really know myself, would guess that connecting the shock to different places makes sense for different bikes. The connecting point of the shock needs to support a pretty high force, meaning that the top tube would need to be made stranger for connecting there, but connecting there may also result in smaller/lighter links than it wold take to connect it to the seat tube/BB

Edited by Daniel J Méssem
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I had a Merida AM before I got my Anthem last week. I hated the psotion of the rear shock because it made it almost impossible to put my bike on my boot rack, and beacuse of it I couldn't have a water bottle on my frame, so I always had to carry a camelbak on my rides.

 

The anthem's shock is in a similar position to the merida, but fits there WAYY better, now I put the bike on my car with ease, and I can have a water water on my frame.

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I'm guessing it has to do with the linkages used and leverage ratios they want to achieve and the frame design - how much space there is are where they want to direct the frame stresses to.

 

For example, with the following frame they could probably with an extra rocker link make the shock position vertical as on the Giant Anthem. I prefer designs where the shock is vertical, to me it looks nicer and it make carrying the bike easier.

http://www.pivotcycles.com/up/editor/429black.jpg

http://bicyclebusiness.en.ecplaza.net/sitebuilder/images/giant_anthem_x_2011_frame__13451_zoom.jpg

Edited by Jacquers
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Funny this, is was looking into this yesterday to also determine which if any position is better than the other...

 

I eventually gave up when my head started hurting!! :eek:

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Does anyone else notice in the video...

 

Maestro "near perfect vertical wheel path" = efficient.

Stump Jumper "perfect vertical wheel path" = inefficient.

 

Huh??? That doesn't make sense..

 

Yeah, I did see that... was wondering about that.

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