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  1. #1
    Join Date
    Aug 2010
    Location
    CO
    Posts
    56

    Question about bike geometry?

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    Sorry for the ignorant question, but how do I tell from reading specs what kind of geometry a bike has? How does a relaxed geometry differ from aggressive geometry? I see the measurements and such, but I don't know what constitutes relaxed vs. aggressive. I also noticed that I got a men's bike and the top tube and wheelbase are longer than the comparable women's model, yet they still had to work with the bike because I'm short but the top tube was still a little short for me. That makes it sound like I need a long top tube despite being short (5'3") and all the womens bikes seem to have a shorter top tube.

    Thanks.
    2010 Specialized Sirrus Comp (XS)
    2010 daVinci Global Venture

  2. #2
    Join Date
    Sep 2010
    Posts
    212
    You have a pretty good handle on it. Relaxed/Aggressive/"Criterium" geometry is kinda bike shop jargon and it's meaning is a bit dependent on the topic and the rider.
    For the most part, I recommend not worrying about it and decide if the bike FEELS good to you when you ride it.
    My supposed ROAD race geometry bike was the best criterium racer I ever owned. Wide and fast thru the turns rather than sharp and slow.
    These days Relaxed generally means a taller head tube so the drop from the saddle to the handlebars is LESS extreme. (ie Spec Ruby vs Amira)
    It can also mean shorter (aggr) or longer (relaxed) wheelbase for responsiveness
    Steeper (agg) or shallower (relx) head and seat tube angle for agility and responsiveness.

  3. #3
    Join Date
    Apr 2007
    Location
    Bay Area, CA
    Posts
    336

    Question angles question

    I have also been wondering about head tube and seat tube angles and what they mean. When you say steeper = more aggressive, does that mean higher numbers? And then slacker = more relaxed = lower numbers?
    ...never met a bike that I didn't wanna ride.

  4. #4
    Join Date
    Aug 2006
    Location
    Melbourne Oz
    Posts
    174
    The genuine WSD models will have shorter top tubes because women on average have shorter torsos relative to men. So it's about proportions rather than height. For example a friend of mine who is the same height has short legs so her critical issue is standover height, whereas I have short reach and therefore (effective) top tube is a key number for me. If you have a longer torso and fit unisex bikes, great. You'll have a wider choice of models. Just so long as it fits and feels right, cool. And both geometry and frame material (as well as components) will affect how they feel.

    And yes, steeper seat tubes means higher numbers. Most women's production bikes are 75ish, not necessarily for fit but for production economics while a tri bike can be 76-78.

  5. #5
    Join Date
    Nov 2009
    Location
    West MI
    Posts
    4,259
    Yep, in hindsight I wish I'd gone with a men's frame, since I have stubby legs and longish torso, but I like the smaller-reach Shimano shifters on my WSD bike. My next bike will be men's/unisex and have SRAM with adjustable-reach shifters, so it won't be an issue.
    Kirsten
    run/bike log
    zoomylicious


    '11 Cannondale SuperSix 4 Rival
    '12 Salsa Mukluk 3
    '14 Seven Mudhoney S Ti/disc/Di2

  6. #6
    Join Date
    Sep 2010
    Posts
    212
    ZZ.. We have frequently been ADDING stem length to "WSD" bikes to get them to set up properly. Maybe an option for you to get the smaller bike you need AND add a bit of "cockpit" length?

    One thing to keep an eye out for with top tube length is that a manufacturer can "cheat" their way to a short top tube on the specs page by making the seat tube angle steeper. This is ineffective b/c we just end up needing to slide the saddle back to get you over the pedals correctly....Negating the shorter tube.

  7. #7
    Join Date
    Apr 2006
    Location
    Maine
    Posts
    959

    Question about bike geometry

    The other thing that happens in creating WDS frames is companies lengthen the headtube, which also shortens the top tube length. In reality, perhaps a bit better, simply because it leaves the seat tube in a better position.

    Although you can always add a longer stem to a bike to give you more room in the cockpit; it at at times can seriously affect the handling of the bike as well. Of course, it's different from one person to the next, but I would seriously THINK about this and talk with the PROS before doing too much of this. Ideally, the bike should fit you as well as it can BEFORE you start making changes to it... in that regard perhaps another brand would fit better and even better yet Luna could definitely make that happen.

 

 

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