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Old 09-08-11, 04:48 AM   #1
jsidney
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Frame size on a touring bike.

I have an 86 Trek 520 with the straight bar that I got today and I have a question on frame sizing.

When I straddle the bike barefoot I am in contact with the top bar, we any kind of shoes I am above the top bar. When I get on the bike in the drops I fell scrunched.

There is another bike that I cannot straddle the bike at all but once moving seems to fit me well.

I am 5'8 1/2 - 5'9 and have 30 inch legs.

It seems if I get a bike that height the frame seems too short. If the frame seems like the right length I have trouble getting on it.

What kind of steps can I take to get past this with a Trek 520. I really like the bike but it is just a bit too short, well it feels to short.
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Old 09-08-11, 04:56 AM   #2
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What is the top tube length and what is the stem extension? Is the saddle properly positioned, is the seat post in the correct way? There is a lot more to bike fit than straddling the top tube, that is just a quick and dirty start to proper fit.

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Old 09-08-11, 05:00 AM   #3
onbike 1939
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I have very close to your measurements and ride a 54 cms (21 and 3/4")frame. What is important is the Top tube length as this does affect your comfort considerably. A rough measurement can be obtained by having your elbow at right angles and placed against the toe of the saddle. With you fingers outstretched they should touch the bars if these are Drops. If Flat bars, then your fingers should be approx 2" short of the bars (this is a good starting point). The correct distance can be found by moving the saddle back and forward but for touring it's best that the saddle be not too forward towards the Bottom bracket. It may be necessary to fit a shorter stem rather than have the saddle over the BB.
Hope this helps.
Edit: I now see that the bike is one with Flats. In this case begin with the fingers 2" short of the bars and then ride the bike before making any changes. Too close bars are likely to cause sore hands and wrists while too far away and your neck will begin to ache. Find the sweet spot which should allow you to maintain your position while removing your hands from the bars.

Last edited by onbike 1939; 09-08-11 at 05:03 AM. Reason: addition
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Old 09-08-11, 06:04 AM   #4
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jsidney, Generally one frame size smaller than a road bike's size appears to be the most common suggestion. I concentrate more on the fit while riding than the stand over clearance. My touring frame is actually 1/2 cm taller than my roadie and it hasn't been an issue.

Position your saddle fore and aft properly and fine tune with the stem.

Brad
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Old 09-08-11, 10:23 AM   #5
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Quote:
When I get on the bike in the drops I fell scrunched.
change the stem, you probably need a longer one ,
a tall frame is fine, as you Will wear shoes , and not be doing Gnarly Off road rides.

Quote:
30 inch legs.
, what are you measuring?,

if you pull a horizontal bar up as high off the ground, as possible,
is that what you measure, as maximum stand-over height?

Last edited by fietsbob; 09-08-11 at 10:28 AM.
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Old 09-08-11, 11:13 AM   #6
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Trek 520 originally has a drop bar. With the same stem, these protrude about 4" forward of the flat bat position, thats why you feel scrunched up, its like riding on the tops the whole time.
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Old 09-08-11, 12:10 PM   #7
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Sounds like you need a different stem and/or bar extensions or the original drop bars/levers
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