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  1. #1
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    Question Buying a Trek Domane... 56 or 58 cm?

    It's time for me to retire my nearly 15 year old Trek 5200 and replace it with a 2014 Trek Domane. I was at the bike store yesterday and noticed that the frame angles have changed considerably since I bought my 5200. My 5200 has a 58 cm frame, but when looking at the 56 cm Domanes, the top tube looks pretty darn high, making me wonder if I need a 56 or a 58 cm frame?

    I'm *almost* 6'1" tall, but apparently shrinking already do to age (my 40th birthday is just around the corner) or because I slouch too much (I weight 165 lbs if that matters.) The sign on the Domane at the bike store said that the 56 cm would fit riders up to 6'0"... which is obviously pretty close to my size.

    What should I look for when determining if I need a 56 or a 58 cm frame since I seem to be 'right on the edge' between the two sizes? In theory, a 56 cm should be a tad lighter... would there be any reason why I shouldn't go with a 56?

  2. #2
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    The measurement of relevance is "effective top tube". It converts the sloping top tube length to an equivalent horizontal length. Vertical height is just a matter of properly adjusting the seat. I'd think the 58cm would be a better fit. Test ride both at the shop then decide.

  3. #3
    coprolite fietsbob's Avatar
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    Can't see you on the bike so a blind guess.. I have a level top tube 56 road bike , I'M 5'10"

    those have a sloping top tube.. the shop have both sizes ?, or do they have to order one, just one.

    shopping in Person answers many questions posed by just looking at pictures theoretical issues of web surfing.

  4. #4
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    Yeah, the Domane's have a sloping top tube which makes sizing weird to me. From Trek's web site:

    If youíre between sizes, itís generally best to go with the smaller size. Itís easier to make a smaller frame fit a little larger than vice versa.
    I was supposed to pick-up the bike yesterday (a 56 cm Domane 5.2), but the mechanic who was assembling the bike said he wasn't happy with how it was shifting and didn't want to give it to me until he could speak with Shimano and find out what's going on. Because of the shifting issues, I wasn't able to actually go through the bit fitting process to ensure the 56 cm is indeed going to work.

    Oh well... better to be working through these issues now while it's too cold to ride anyway than when it's 70 degrees out and I'm itchin' to ride!

  5. #5
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    I am 5'10" and I fit like glove on a 56 road bike. I am no expert and I don't know Treks but I would guess the 58 would be better fit for you. Does the bike shop not help you with fitting the bike? You should really try both sizes or spend some time researching before you buy one. Would be a shame to spend years riding a bike that is the wrong size

  6. #6
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    I've got the 56 cm bike home with me now. Unfortunately, I have no pedals My LBS wanted to "give me a deal" and charge me $250 for Ultegra carbon pedals even though MSRP is $200 and I could get them online for $140, so I told 'em I'll get them online (as I don't like being ripped-off for no apparent reason).

    W/o pedals, I haven't been able to do any fitment yet. My LBS said I need to bring the bike back with my shoes and pedals in order to do a fitment, which is fine I guess. I'm a little concerned now about the 56 cm in that when the seat post is maxed-out in height, it's debatable as to whether-or-not that will be high enough to give my legs the right amount of bend. It looks like it'll be very close. My new shoes arrive tomorrow and hopefully the pedals get here this week.

    I'm sure glad I'm doing this now while it's too crappy to ride

  7. #7
    Senior Member woodcraft's Avatar
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    I'm just going from a 57 cm 5200 to a Tarmac.

    I rode a 58, & it was too big, got a 56.

    I'm 6' w/ proportionally shorter legs, longer torso. The guy I bought the bike from was at least an inch taller, and had 1 1/2" more seat post showing.

    I think you'll be happy with your choice & the seat post, but you could get a longer post if needed.

    Can't you use shoes and pedals from your old bike to get started?

  8. #8
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    I see that Trek sells the "seat cap" in 135mm and 175mm lengths... although they must be made of gold as they're $120. The bike appears to be fitted with a 135 mm.

    My loverly Ultegra carbon pedals arrived yesterday. Using the quick "adjust your seat so your leg is straight when your pedal is down and your heal is on it" approach, when the seat height is maxed-out, that's the perfect height. Traditionally, that's how I've always set my seat height... or perhaps made it a little lower than that.

    Is there any reason to think I'd need the seat higher than that? I went through CompetitiveCyclist.com's bike fit calculations and it suggests I should have a 58 cm (or thereabout).

    The shop where I bought the bike will only do very basic measurements for fitment if I take the bike back. Anything beyond a basic measurement is $150+. At the moment, I don't see any reason why this 56 cm frame won't fit me, so I'm thinking I'm not going to go through the hassle of taking the bike back.

    saddleheightheel_hamblylore.jpg

  9. #9
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    Assuming your 5200 fit you well, why not measure the seat height and use that for the Domane? You could also copy the fore/aft seat position relative to the crank arm. If the stem length is OK, then you should be good to go I would think.

    Good luck with the new ride!
    Mal

  10. #10
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    Quote Originally Posted by zx9rmal View Post
    Assuming your 5200 fit you well, why not measure the seat height and use that for the Domane? You could also copy the fore/aft seat position relative to the crank arm. If the stem length is OK, then you should be good to go I would think.
    Yup... I finally wised-up and measured the pedal-to-seat height on my 5200 and my ION, both were at about 37". That happens to be the absolute max height I can adjust the seat post (cap) on the 56 cm Domane, so yeah-me

    After reading the following article, of the 3 methods I could do at home, I came-up with the same seat height calculation of approximately 37", so I think I'm pretty safe keeping this 56 cm bike:

    http://www.bikeradar.com/fitness/art...t-right-14608/

    Here's my new machine... in "boring black"



    On an unrelated note, it seems like it's a lot "bouncier" on my rollers than my 5200. (Since it's snowing and well below freezing right now, all I can do is ride my rollers.) Even when riding as smooth as possible on the rollers on my 5200, there's a little bit of forward-and-back motion as the rear tire attempts to crawl over the rear roller and then rocks back. This small motion seems to be accentuated by the Domane's flexible seat mast. While I don't think I'll notice this at all in the "real world" (i.e., on a street), I'm inclined to think I might just keep my 5200 as a winter roller bike rather than sell it so my indoor training is a little smoother!

  11. #11
    coprolite fietsbob's Avatar
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    Yea and the sweat won't corrode your new bike's parts..

  12. #12
    Senior Member digibud's Avatar
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    For future reference of others in the same situation I will add that when you are faced with two bikes that can both potentially fit you by changing a stem length your choice boils down to whether you want a smaller, more aero racy bike that will have you leaned down further (picture yourself on a tiny toy bike with a super long seat post where you are leaning way down to get to the handlebar) or a larger frame with higher handlebars that puts you in a slightly less aero, more upright position. My 58cm bike is "too big" for me now. I could easily ride a 56cm bike (I'm 6') and I knew it at the time I bought it but I was roughly 100lb bigger and could not comfortably ride the 56 when I got it so I have a very short stem on my 58cm and it's just fine. A lot of people can be comfortably fitted on two different sized bikes by swapping stems.
    Alaskans for global warming.

  13. #13
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    I'd be curious to know how much saddle-to-bar drop the original poster has. You can measure up from the ground to the top of the seat, then ground to top of the bars and subtract the two. The fact that the seat post is maxed out would suggest (on the surface) that the original poster should have gone for a 58cm frame.

  14. #14
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    Quote Originally Posted by Dunbar View Post
    I'd be curious to know how much saddle-to-bar drop the original poster has. You can measure up from the ground to the top of the seat, then ground to top of the bars and subtract the two.
    At the moment, the handlebars are actually higher up than I'm used to, relative to the seat height. The Domane has less ground clearance than my 5200 does, due to a lower bottom bracket, yet the handlebars are at the same height. I think this is due to the Domane having an "endurance" frame design and thus promotes a more up-right position than my 5200 did (or than the Madone's do). As you can see in the photo above, the top of the fork hasn't been cut down, so the stem is pretty high up on a few spacers. I figure I'm going to have to wait until Spring when I can get a few outdoor rides in to determine if I want to leave the stem at it's current height or lower it.

    I don't see any issue so far with my 56 cm as far as fitment is concerned. If I was just a tad taller, there's no doubt I'd need a 58 cm.

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