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Old 03-19-07, 10:22 PM   #1
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LHT sizing question.

On the surly website there's two measurements for the top tube:

Actual (center to center) and effective.

What is Effective Top tube measurement? which measurement is more important?

I thought effective top tube measurement was the length from the center of the seat to the center of the handlebars where your hands would normally rest.
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Old 03-19-07, 10:26 PM   #2
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I don't know if I should get a 42cm or 46cm frame. I'm 5'4 with 27.5inseam and larger torso. I feel comfortable on my lemond buenos aires. 49cm (c-c) 51cm (c-c).

The LHT has sloping topt tube right? Is effective top tube the (virtual) measurement if the bike WOULD have a flat horizontal top tube? If this is the case, then I'm a monkey in the middle since the 42cm has an effective top tube of 50.5 and the 46cm is 51.5. I personally like 51cm? What do I do?

thanks
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Old 03-19-07, 10:26 PM   #3
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its got a slightly sloping top tube, so the effective is the one you want to consider versus the actual length of the toptube.
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Old 03-20-07, 12:04 AM   #4
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Quote:
Originally Posted by 531phile
I don't know if I should get a 42cm or 46cm frame. I'm 5'4 with 27.5inseam and larger torso. I feel comfortable on my lemond buenos aires. 49cm (c-c) 51cm (c-c).

The LHT has sloping topt tube right? Is effective top tube the (virtual) measurement if the bike WOULD have a flat horizontal top tube? If this is the case, then I'm a monkey in the middle since the 42cm has an effective top tube of 50.5 and the 46cm is 51.5. I personally like 51cm? What do I do?

thanks
I have a 52cm LHT and there is little to no slope on the top tube. However, with smaller frames there does appear to be slope to the top tube as evidenced by these pictures of a 42cm frame:

http://surlyville.net/owners-17.html

The top tube length can be adjusted more easily than stand over height with differing length stems. Given this, I would focus first on stand over height. If your inseam is 27.5, then you should have an inch or two extra measured from crotch to floor, say 29 inches.

Maybe the 46cm frame would be the better fit.
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Old 03-20-07, 10:29 AM   #5
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can i semi-hijack this thread? I'm also thinking about getting a LHT and i'm 6 feet tall with 34.5 inches to my pubic bone. i was entertaining the thought of getting the 60cm bike, but am wondering if it might be too big for me. any thoughts? I've been to a few local bike stores and none have a 60 cm frame lying around for me to check out.
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Old 03-20-07, 10:57 AM   #6
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Originally Posted by jimfinity
can i semi-hijack this thread? I'm also thinking about getting a LHT and i'm 6 feet tall with 34.5 inches to my pubic bone. i was entertaining the thought of getting the 60cm bike, but am wondering if it might be too big for me. any thoughts? I've been to a few local bike stores and none have a 60 cm frame lying around for me to check out.
My feeling is that this 60 cm would be too long. I'm 6'1", and recently had a professional road bike fitting. The fitter put me onto bike with a 57.5 cm effective top tube and a 56 cm seat tube (C-T). Keep in mind, I get a lot of my height from the shoulders and up (ie longer neck). The fitter recognized my proportions and fit accordingly. The result is a very comfy ride. In the LHT, the effective top tube on the 58cm size is 58.7cm - that's 12mm longer than my current ride. For a tourer, not sure I'd like to be stretched out more ! The 60 cm would be massively long for me, and I'm an 1" taller than you. Keep remembering the end goal - you want even weight distribution on your butt and arms (too short - butt issues, too long: upper body/neck issues). If you merely adjust stem length, you'll start to affect the bike's handling (stem too short - unresponsive; stem too long - more twitchy). Remember, the LHT is a tourer - you're going to want to look around on those long rides in the country, so don't stretch yourself so much that all you can do is stare at asphault w/o getting stiff neck.

BOTTOM LINE: I HIGHLY recommend you try a 58cm LHT before buying the 60.... you really need to make sure, and again appologive for feeding the threadjack (hopefully this is helpful to others too).
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Old 03-20-07, 11:26 AM   #7
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Professional road bike fitting is just that....professional road bike fitting. Works great for riding in the peleton....but the LHT is a touring bike, a different animal altogether.

Most bike shops know MTBs and road bikes, but little about touring bikes.

It's quite possible to ride a different size frame touring than club riding. Or not.

Buying a frame without a test ride? I wouldn't do it.
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Old 03-20-07, 11:30 AM   #8
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Quote:
Originally Posted by jimfinity
can i semi-hijack this thread? I'm also thinking about getting a LHT and i'm 6 feet tall with 34.5 inches to my pubic bone. i was entertaining the thought of getting the 60cm bike, but am wondering if it might be too big for me. any thoughts? I've been to a few local bike stores and none have a 60 cm frame lying around for me to check out.
My measurement is 31.5 to the bone while wearing my bike shoes. I have the 52cm LHT and Surly advertises a stand-over height of 30.5 with the tire they used. I use a continental top touring and with that tire my bike's stand-over height is 30.25. Overall this frame seems to be a good fit for me.

Does the 34.5 represent your measurement with or without bike shoes? The 62cm frame has an advertised stand-over of 34.1 -- that's cutting it close for you (unless your shoes give you another inch). Given that close fit, I'd probably go 60cm frame with stand-over of 33.5.

TruckerMike recommends the 58cm so you are not stretched out on the bike. I like an upright riding position, so I ride mountain bikes with short-reach stems and high-rise bars. Before I bought the LHT, my most comfortable frame had an effective top tube length 2 inches longer than the LHT. It seems the LHT frame, as a tourer, already has a top tube that is shorter than many by comparison to help with the more upright positioning. The difference in effective top tube between 58cm and 60cm frame is .5 inch. The difference between then in stand-over height is .7 inch. Seems not much difference between the two frames.

I think TruckerMike and I agree the 62cm frame may be too large, but personally I would opt for the 60cm frame.

For more comparisons and fit suggestions, a good place to post this question is the Surly LHT group:

http://groups.google.com/group/SurlyLHT/topics?hl=en

I'm sure there are folks in the group with size 58, 60, and 62 who could give you measurements and thoughts.
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Old 03-20-07, 01:40 PM   #9
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i'm not interested in the 62cm, i think that would be way too huge. I'm just debating between the 58 and the 60. The height i gave (34.5 inches) to my pubic bone is without shoes, if that helps at all.
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Old 03-20-07, 02:50 PM   #10
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Quote:
Originally Posted by tacomee
Professional road bike fitting is just that....professional road bike fitting. Works great for riding in the peleton....but the LHT is a touring bike, a different animal altogether.

Most bike shops know MTBs and road bikes, but little about touring bikes.

It's quite possible to ride a different size frame touring than club riding. Or not.

Buying a frame without a test ride? I wouldn't do it.
In this case, i was buying a rando bike, not a road/peleton bike and the fitter knew this and had done lots of this type. He even said he'd fit me differently on a pure road bike.

The poster has given us inseam, but the torso and arm length are also really important to determining the best size. The idea with LHT's is long rides, and I think the fit is more important that ever. So again, try the 58cm before you buy. A half inch in the right place actually can make a huge difference to the bike's handling or your comfort, so don't try to force it to work/fit.

A cheap bike that doesn't fit isn't a good deal........
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Old 03-20-07, 05:57 PM   #11
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jimfinity =, I'm 6'1", and I take the 58. I'm 33 in stand over, so on that basis you could probably go the extra size, but it probably isn't going to feel generous in standover, not what you would buy for falling off the bike on trails. However, I would expect you to be shorter in the torso. Do your wingtip measurement, and if you find yourself much shorter than 72 inches, then I think you are probably going to find the 60 long for TT length

Try these guys and the French Fit calculator:

http://www.competitivecyclist.com/za...LCULATOR_INTRO

That may not be perfect, but it should get you on the right frame, or at least give you food for thought. I use program for frame fit, and then do all the additional fitting by feel.
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Old 03-20-07, 08:00 PM   #12
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Originally Posted by jimfinity
i'm not interested in the 62cm, i think that would be way too huge. I'm just debating between the 58 and the 60. The height i gave (34.5 inches) to my pubic bone is without shoes, if that helps at all.
I'm about your height and a cm higher in the inseam and to be honest, I would think long and hard before buying any LHT. They're just too long for the fit I like. I think I'd have to drop down to a 58 and use a big stack of spacers on the steerer.
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Old 03-20-07, 08:56 PM   #13
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Originally Posted by jimfinity
can i semi-hijack this thread? I'm also thinking about getting a LHT and i'm 6 feet tall with 34.5 inches to my pubic bone. i was entertaining the thought of getting the 60cm bike, but am wondering if it might be too big for me. any thoughts? I've been to a few local bike stores and none have a 60 cm frame lying around for me to check out.
You have exactly the same dimensions as me,and the 58cm fits absolutely perfectly. I like a bigger fit too, but 60cm would have been too big. 72" wingtip measurement. I use a 110mm stem.
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Old 03-24-07, 09:08 AM   #14
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Not a chance! I'm 6 feet tall and have a 33" inseam and my 58 LHT is too small. I'm going for a 60.

Richard
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Old 03-24-07, 01:30 PM   #15
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Originally Posted by jens5
Not a chance! I'm 6 feet tall and have a 33" inseam and my 58 LHT is too small. I'm going for a 60.

Richard
Richard - can you elaborate? Are you using drop bars or flat bar ? Do you use a short stem? Why does the 58 feel small" - knee too close to handlebar? Toe strike? Too many headset spacers or lots of post showing ?

I mean, with a 586mm effective top tube, and a 33" inseam/6' tall, you should have a long enough LHT cockpit with the 58 frame, drop bars and an appropriate stem.

For contrast, I'm 6'1", with a 34.25" inseam (to pubic bone), 71" wingspan, and have a sport touring frame (575mm effective top tube), that fits great. So I've got 11mm less top tube length, yet have longer legs that you, and don't have any issues with frame being too small. I'm not even doing full-on touring, but just long distance cycling. For touring I'd want to be more upright, and less stretched out so I could look around more easily. My point is that the 60" LHT would stretch me out a lot and for long days in the saddle and touring, I'm not sure that's what most would be after.
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Old 03-25-07, 10:02 PM   #16
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i'm also hijacking this thread....

i have a similar problem,
i just tried out the randonee and i like the sizing, but i want to get a LHT,
im trying to choose between a 54, 56 or 58 for the LHT. my randonee is a 55

here are the numbers

Item, RANDONEE, [LHT 54, LHT 56, LHT 58] all in cm

Seat Tube CT 58.5 [ 54 56 58]
Top Tube CC 55.4 [55 56.4 58]
Stand Over 83.8 [79.3 81.2 83.0]
Wheel Base 103 [106,3 105,5 106.6]
Head Tube Angle 72 [ 71 72 72]
Seat Tube 73 [ 73 73 72.5]
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Old 03-25-07, 10:12 PM   #17
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I've been quizzically raped.
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