What's the difference?

Discussion in 'Mountain Biking, Trials and BMX' started by Serenity, 9 Aug 2006.

  1. Serenity

    Serenity New Member

    Anyone have opinions on the benefits of a 4 bar suspension vs. single pivot vs. horst link?
  2. Townsend

    Townsend New Member

    They all have differing amounts of syllables? </CluelessRoadie>
  3. OP

    Serenity New Member

    Very good. I'm proud of you. Now tell me about the boing factor.
  4. Townsend

    Townsend New Member

    Must refer to the advances regarding aerodynamics made by the Boing Corporation during the development of air and space travel? Or perhaps it was Boeing... :blush:
  5. OP

    Serenity New Member

    Well ya know that if Boeing had four bar, a lot of accidents would have been prevented...
  6. Pottsy

    Pottsy ...

    SW London
    But if Boeing had 4 bar technology I'd be drunk every time I flew. :blush:
  7. I only know the difference between single pivot/linkage activated single pivot and the classic 4 bar design you used to get on the old Turner 5 spots.

    The essential difference is the vertical line through which the rear wheel travels. With a single pivot/linkage activated single pivot, the rear wheel moves in an arc around the pivot point (ie where the swingarm is attached to the frame). With a 4-bar, the rear wheel moves in a vertical line and doesn't arc around the frame.

    It's arguable that the 4bar system is better for climbing because the rear wheel doesn't tend to 'tuck under' the frame under pressure on lumpy climbs. It's also arguable that they're more stable in corners. This is definitely true when you compare it to a classic single pivot (eg like on a santa cruz/orange), but with a linkage activated (eg Ventana X5) you get comparable stability.

    I don't know how the horst link works, nor could I explain virtual pivot points either!
  8. spesh

    spesh Well-Known Member

    Quoted from the FAQs at Competivecyclist.com,
  9. Peyote

    Peyote New Member

    I think the Horst-link design is one variation on the whole four-bar design, anyway as someone has already said, the four-bar design is more active and attempts to minimise chain growth and 'kickback'. As far as I can tell in most cases it works and four-bars do tend to pedal better than single pivots.

    However, single pivots are simpler: there's less to go wrong and because they tend to have fewer pivots they are also generally stiffer. In addition some of the more prominent proponents of single pivots claim that you 'feel' more of the trail through such a design. But then I've heard people say similar things about fixed, singlespeed and fully rigid MTBs too!

    Of course the design of the frame isn't the only important factor, shock choice can change the characteristics of a bike considerably. There are so many variations around that I can't do them all justice in this post (without boring people silly!). Suffice to say that air shocks/coil shocks, platform valving and the myriad of rebound adjustments, positive and negative chambers etc. all add something different to the bike. That's before you get into the 26"/29", tyre choice and tubeless debates!

    It's a fascinating area if you're a bit of a tech. geek! :blush:
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