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Do Trek bikes run small? Comparing their size chart to others'

Old 06-13-20, 04:58 AM
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Captain_Canada
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Do Trek bikes run small? Comparing their size chart to others'

Hi! I'm looking at Trek's size chart and it looks like Trek reccommends about a size bigger for given height/weight than what I'd expect. 58cm for someone 5'10.9-6'0.8 and 60 cm for someone 6'0.8-6'2.8

As a 6'2 person my current CAAD10 is 58cm and seems spot on. Is a trek typically sized up one size? Looking at the domane.

Thanks!
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Old 06-13-20, 05:20 AM
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Originally Posted by Captain_Canada View Post
Hi! I'm looking at Trek's size chart and it looks like Trek reccommends about a size bigger for given height/weight than what I'd expect. 58cm for someone 5'10.9-6'0.8 and 60 cm for someone 6'0.8-6'2.8

As a 6'2 person my current CAAD10 is 58cm and seems spot on. Is a trek typically sized up one size? Looking at the domane.

Thanks!
What's your inseam? Start with that.
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Old 06-13-20, 05:53 AM
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Originally Posted by Captain_Canada View Post
Hi! I'm looking at Trek's size chart and it looks like Trek reccommends about a size bigger for given height/weight than what I'd expect. 58cm for someone 5'10.9-6'0.8 and 60 cm for someone 6'0.8-6'2.8

As a 6'2 person my current CAAD10 is 58cm and seems spot on. Is a trek typically sized up one size? Looking at the domane.

Thanks!
Sizing based on height is really coarse - take it with a big grain of salt. I would start by comparing the stack and reach of your CAAD 10 to that of the Domane. The Domane is probably going to be taller (more stack height) for the same amount of reach, which will put you in a bit more of an upright position than the CAAD, all other things equal (spacers under the stem, stem angle and length, etc). Keep this in mind when thinking about your fit on the CAAD and the fit that you're looking for on the Domane.

Originally Posted by bruce19 View Post
What's your inseam? Start with that.
Goodness, no - that's mostly irrelevant with regard to frame size, and has been for decades.
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Old 06-13-20, 08:05 AM
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Originally Posted by Captain_Canada View Post
Hi! I'm looking at Trek's size chart and it looks like Trek reccommends about a size bigger for given height/weight than what I'd expect. 58cm for someone 5'10.9-6'0.8 and 60 cm for someone 6'0.8-6'2.8
As a 6'2 person my current CAAD10 is 58cm and seems spot on. Is a trek typically sized up one size? Looking at the domane.
I think you're right in that Trek's size chart for the new Domane is very, very odd to darn right wrong.

I own a 2020 Domane SL7. I'm 6'1" tall with a 33" inseam and ride a 58cm frame. What I find absolutely crazy is that with the stock seat post, I had the seat as far down as it could possibly go and that barely worked for me! I've never had that problem on a 58cm frame before. What makes that even more ridiculous is that according to the size chart, I should be riding a 60cm frame?!?! If I had purchased a 60cm frame the seat post wouldn't work at all. I had my LBS swap-out the seat post that came on the bike with the shorter model so now I at least have some vertical adjustability in the post.

Beware that the Domane has an "endurance fit" which makes them a little odd compared to other race bikes. What that typically means is that the head tube (vertical tube the fork goes into) is much taller on the Domane than it is on race bikes to give the rider a more comfortable, up-right position. I had a 58cm Trek Boone which does not have the endurance fit and compared it to my old 56cm Domane and found the head tube was the same height on both bikes (i.e., the 56cm Domane head tube was really tall.)

If you have Trek dealer near by, I'd call them to find out if they have any Domanes in stock so you can see for yourself if the 58cm will work for you. I was just at 2 bike stores yesterday and it's crazy... the showroom floors were almost completely empty due to a combination of high demand and an inability to get new bikes in-stock from Trek.

Sizing issues aside, I love my new Domane... it's a really well made, well thought-out endurance machine.


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Old 06-13-20, 08:17 AM
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Thanks for the replies!

Inseam is 33-34

My 58cm CAAD10 has all but one spacer underneath the stem (about an inch of spacers) so while it's a race frame I have it set up somewhat upright (professionally fitted/feels good).

My usual routes have both smooth and rough roads and hills (SF bay area). While I can get up fine with my gearing (50/34 12/30) I'm sure I'd use easier gearing if I had it, plus wider tires seem like the way to go.

Definitely will be test riding too! It seems to take me a lot longer to feel what's right and wrong from a fit perspective, trying to minimize the chance of regret a few months into ownership. The sizes shown in Trek's sizing seem way bigger than I'd expect for given height and inseams, I appreciate the opinions.
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Old 06-13-20, 08:20 AM
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Originally Posted by bruce19 View Post
What's your inseam? Start with that.
Originally Posted by WhyFi View Post

Goodness, no - that's mostly irrelevant with regard to frame size, and has been for decades.
not when you know the rider's height and inseam.

the OP is 6'2", so if his inseam is 32"-34" I would say try a 58cm.. Over 34" try a 60cm. He might need a longer stem on the 58cm bike.

I'm 6'2" with a 37" inseam, and ride a 60cm Domane.


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Old 06-13-20, 09:02 AM
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Originally Posted by noodle soup View Post
not when you know the rider's height and inseam.

the OP is 6'2", so if his inseam is 32"-34" I would say try a 58cm.. Over 34" try a 60cm. He might need a longer stem on the 58cm bike.

I'm 6'2" with a 37" inseam, and ride a 60cm Domane.

Is that 60 frame a manufacturer's designation or did you measure it using a virtual TT? Curious because my CAAD 12 is a 53 labeled but a 55 measured virtually. And, a 55 is what my 32.5" inseam requires. BTW, nice looking bike.
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Old 06-13-20, 09:15 AM
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Originally Posted by bruce19 View Post
Is that 60 frame a manufacturer's designation or did you measure it using a virtual TT? Curious because my CAAD 12 is a 53 labeled but a 55 measured virtually. And, a 55 is what my 32.5" inseam requires. BTW, nice looking bike.
60cm manufacturer's designation(with a VTT). I absolutely love the bike, and would change nothing. It's a perfect fit, and rides like it's on clouds.
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Old 06-13-20, 09:26 AM
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Since we're showing our Domanes, here's mine.
It's a 62cm 2020 SLR. I'm 6'4" and ride with an 835mm BB to saddle height with 175mm cranks. I have the long seat post option and the longer setback. I do have the shorter setback too, but it's not installed.

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Old 06-13-20, 09:40 AM
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Originally Posted by ckindt View Post
Since we're showing our Domanes, here's mine.
It's a 62cm 2020 SLR. I'm 6'4" and ride with an 835mm BB to saddle height with 175mm cranks. I have the long seat post option and the longer setback. I do have the shorter setback too, but it's not installed.

What is the actual weight of that bike?
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Old 06-13-20, 10:11 AM
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Originally Posted by noodle soup View Post
What is the actual weight of that bike?
~19.5lbs. completely stripped of gadgetry, tools and hidden pouches.
With xxx4s and 25mm GP5k/latex tubes.
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Old 06-13-20, 10:16 AM
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Originally Posted by ckindt View Post
~19.5lbs. completely stripped of gadgetry, tools and hidden pouches.
With xxx4s and 25mm GP5k/latex tubes.
Those newer ones got a little porky.
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Old 06-13-20, 10:20 AM
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Originally Posted by noodle soup View Post
Those newer ones got a little porky.
I have a 2018 Domane and you can feel the weight difference compared to my Madone 9 when you lift them up.
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Old 06-13-20, 10:31 AM
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Originally Posted by noodle soup View Post
not when you know the rider's height and inseam.
I didn't know the rider's height and inseam, neither did the person to whom I was responding, so the assumption was that he was referencing old-school sizing methods based off of non-compact designs and seat tube length and/or stand-over height, which is a non-issue for the vast majority of people.

Originally Posted by noodle soup View Post
the OP is 6'2", so if his inseam is 32"-34" I would say try a 58cm.. Over 34" try a 60cm. He might need a longer stem on the 58cm bike.
Maybe, but it depends. He's got his bike in front of him, he can see how it's set up. He should have an idea of what he's looking for, position wise, relative to his existing bike, so that's probably a better starting point than "in general..."
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Old 06-13-20, 10:34 AM
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Originally Posted by colnago62 View Post
I have a 2018 Domane and you can feel the weight difference compared to my Madone 9 when you lift them up.
My 2015 Domane is under 17lbs with pedals and bottle cages.
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Old 06-13-20, 10:39 AM
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Originally Posted by WhyFi View Post
I didn't know the rider's height and inseam, neither did the person to whom I was responding,
Actually, the OP said he was 6'2" in his first post, so knowing his leg length and his height will tell you if he's of normal proportions.
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Old 06-13-20, 10:44 AM
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Originally Posted by noodle soup View Post
My 2015 Domane is under 17lbs with pedals and bottle cages.
I feel like the adjustable ISO Speed added some extra weight.
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Old 06-13-20, 10:48 AM
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Originally Posted by noodle soup View Post
Actually, the OP said he was 6'2" in his first post
I realize that.
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Old 06-13-20, 10:51 AM
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Originally Posted by colnago62 View Post
I feel like the adjustable ISO Speed added some extra weight.
As did the front IsoSpeed that was introduced in 2016 (I think?); noodle soup's Domane doesn't have that, either, so it'll be a little lighter on that count, as well.
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Old 06-13-20, 11:36 AM
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Originally Posted by WhyFi View Post
I didn't know the rider's height and inseam, neither did the person to whom I was responding, so the assumption was that he was referencing old-school sizing methods based off of non-compact designs and seat tube length and/or stand-over height, which is a non-issue for the vast majority of people.
Correct. I asked for inseam so that the OP could measure the bike using it's virtual TT and get an actual frame size rather than the sloping TT sizes which are often inaccurate. As I said in a subsequent post, my CAAD 12 is a 53 according to Cannondale but measurement using a virtual TT it is actually a 55. Which fits me perfectly using the LeMond-Guimard formula for sizing.
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Old 06-13-20, 12:22 PM
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Originally Posted by noodle soup View Post
Those newer ones got a little porky.
Yeah, they did.
I knew that before I bought it.
No WW here.
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Old 06-13-20, 12:27 PM
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Originally Posted by colnago62 View Post
I feel like the adjustable ISO Speed added some extra weight.
Originally Posted by WhyFi View Post
As did the front IsoSpeed that was introduced in 2016 (I think?); noodle soup's Domane doesn't have that, either, so it'll be a little lighter on that count, as well.
correct on both points.

the 2015 Domane 6.9 doesn’t have front Iso or adjustable rear Iso, and IMO its a better “strictly road” bike. I was thinking about buying an SLR frameset, but for me it didn’t make sense.
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Old 06-13-20, 05:21 PM
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I have to wonder how many SLR owners actually adjust their rear ISO decoupler beyond it's initial setting. It's not like a dropper post where you can adjust it on the fly while riding. How many people ride an entire ride on something like cobblestones and adjust the frame one way, then ride completely smooth roads the next ride and adjust the frame accordingly?

The adjustability is useful so that a 250 lbs rider can setup the frame differently than a 150 lbs rider, but once set I bet my bottom dollar that the ISO decoupler rarely gets adjusted again.
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Old 06-13-20, 05:30 PM
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Originally Posted by noodle soup View Post
Those newer ones got a little porky.
True dat I've been trying to do something about that as money allows:
Dear Diary: My Trek Domane Must Go on a Diet
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Old 06-13-20, 08:17 PM
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Originally Posted by PoorInRichfield View Post
True dat I've been trying to do something about that as money allows:
Dear Diary: My Trek Domane Must Go on a Diet
Luckily weight doesn't really matter all that much. 2-3lbs off your bike with a 180lb rider doesn't make a huge difference. No one wants an overweight bike, but it doesn't make a huge difference in reality.
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