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  1. #1
    Join Date
    Aug 2012
    Location
    Columbus, IN
    Posts
    221

    What size Specialized bike to order?

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    I'm looking at ordering a new bike, I think I'm going to go with a Specialized Ruby although I haven't decided on which model yet (Comp or Elite). I'm not sure whether I'll be a 54 or a 57. A year ago, I rented a Roubaix in a size 54, and that seemed fine but I only rode for like 90 minutes in a social ride so I'm not sure I'd be able to tell.

    I currently own a men's Trek Domane 4.5 in size 56 and I'm happy with the fit. My fitter changed out the stem for a bit longer than the factory stem to get a longer reach (apparently I have really really long arms). I'm 5'9" tall. I haven't talked to the person doing my fitting about this because he's at a Trek store. I'm pretty happy with my Trek (so why am I looking at a new bike? I don't know. Because I want a new bike :-) I also want to have two bikes so I can keep them in two different places and not always transport them).

    The bike shop I'm working with doesn't have any of the size 57 Specialized women's bikes for me to try. They're actually suggesting maybe I should try a Roubaix.

    I know there are women here who are masters at figuring out geometry (unfortunately I'm not). Any thoughts on either a 54 or a 57?

    Amy

  2. #2
    Join Date
    Jun 2010
    Posts
    6,466
    The 54 Ruby and 54 Roubaix are similar to the Trek, with the Ruby being maybe .5 cm smaller overall. The reach on the 57 Ruby makes it about 1 cm larger overall than the Roubaix and Trek, even though the TT is similar.

    The Domane is more upright, but the Roubaix should be able to achieve the same setup. (Don't have time to input the Tangential formula to make certain, I have to look it up and figure it out again, maybe I could do it tomorrow, though, to make sure).

    At 5'9", I'd get the men's. I'm 5'7" and can ride men's or women's, but men's bikes tend to be spec'd better. Plus, the resale value is higher.

    Sized:
    Trek Domane size 56:
    Eff TT= 55.4
    HT = 17.5
    Reach = 37.7
    Stack = 59.1

    Roubaix size 54
    Eff TT = 54.7
    HT = 16.5
    Reach 38.0
    Stack = 56.4

    Ruby Size 54
    Eff TT = 53.6
    HT = 16.5
    Reach = 37.4
    Stack = 56.6

    Ruby Size 57
    Eff TT = 56.4
    HT = 19.0
    Reach 390
    Stack = 588.8
    Last edited by Muirenn; 11-02-2015 at 01:04 PM.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

  3. #3
    Join Date
    Aug 2012
    Location
    Columbus, IN
    Posts
    221
    Thank you Muiren! That gets me started. Believe it or not - the Roubaix and Ruby are spec'd out almost identically - about the only difference is going to be in the saddle. I currently ride a Oura 155 on my Trek, and the Ruby comes with the Ruby Expert 155 so I presume it will work for me while the Roubaix has something else in a 143.

    I can stand to be a little more aggressive than I am in my Domane now, but I still wanted the "comfort" type style for longer rides. I'm considering the Ruby/Rubaix because (and I'm probably doing an awful job of explaining this) because while I love the seat/feel of the Domane, the handlebars seem "stiffer" or I feel more chatter in my hands and I'm wondering if the zertz in the front fork will fix that in the Ruby/Rubaix on longer and rougher rides. I should probably do more test riding before I decide what to get :-) Winter is coming and I'm not doing many long rides in Indiana now anyway so I should probably wait for spring.

  4. #4
    Join Date
    Jun 2010
    Posts
    6,466
    Just to be clear, the 54 Roubiax is closest to the Domane in size. What length stem is on your Domane? Do you have a picture of the bike from the side? The way it is set up could determine whether it might be a good idea to go a little larger or smaller.

    Edit: Carbon stems on all three of my road bikes got rid of the chatter. Go figure. Best and cheapest upgrade I ever made.

    Overall, the Roubiax is a tiny bit shorter or more aggressive in the head tube ( than the Domane) and a tiny bit longer, so a little more aggressive overall, but not much. The Ruby's are a size larger or half a size shorter, whereas I'd consider the Domane and Roubiax the same size.
    Last edited by Muirenn; 11-02-2015 at 05:14 PM.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

  5. #5
    Join Date
    Aug 2012
    Location
    Columbus, IN
    Posts
    221
    Click image for larger version. 

Name:	0001.jpg 
Views:	88 
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ID:	17840I like the idea of a carbon stem. I might look for one.

    According to my last bike fitting, I have a 90 mm x 97 degree stem. I don't know what the original stem was - I know the replacement is longer and it helped me feel less "crunched." I also have the seat and handlebar at the same level, but I could handle a bit more aggressive and we talked about maybe changing that. I'm trying to read the other measurements of the bike fitting, but they don't quite seem to line up exactly.

    The horizontal measurement from the front of the saddle to the bottom bracket is 9.5 cm, while the horizontal measurement from the front of the saddle to the handlebar attachment at the stem is 53 cm. I must not understand what "reach" is effectively measuring because I'm having trouble making those measurements work with the Domane's measurements (or maybe they're not adding up because I'm not taking into account the original stem on the bike or the length of my saddle since it looks like the measurement doesn't go to the seatpost?). I've tried to upload the fitting report here. I'm usually pretty good with visual/geometry kind of stuff, but for some reason I seem to be obtuse on bike geometry. Thank you for your help.
    Last edited by Aromig; 11-04-2015 at 08:16 AM.

  6. #6
    Join Date
    Jun 2010
    Posts
    6,466
    That diagram appears to measure the changes that take place based on set-up. One angle seems to indicate you need a seat post with a certain degree of setback-2 deg?), another how's stem length, another how he hoods need to be oriented. Reach is not indicated. Neither is stack. Since the bike already exists, hey are moot points, what matters is how it is set up. To compare the basic bike's geometry to another bikes, you need effective top tune, head tube, stack, reach, and head tube angle. These are put in a simple tangent formula, and measured against the same numbers on a possible future bike, and solved for a variable. The difference will tell you if the bikes can be set up the same way, or if one is bigger overall or smaller than another. Your fitter was working with a specific bike, with the goal of fitting it to you. The numbers used to compare sizes were irrelevant. I'll work he numbers later, sorry, just don't have time at the moment, but I'll link to he original thread where I learned this. You will give them all a common stack size by changing the theoretical spacer size. Start with the Domane and give it a space of .8, and equalize from there. Just a second....
    Last edited by Muirenn; 11-04-2015 at 10:12 AM.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

  7. #7
    Join Date
    Jun 2010
    Posts
    6,466
    Read Laura's answers. Start at post number 31, then especially post 38.

    http://forums.teamestrogen.com/showt...t=47718&page=3

    But it's a great thread, overall. If you read my earlier questions and answers, it's clear I didn't understand at the time. This entire thread allowed me to grasp bike geometry.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

 

 

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