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Fitting questions(9 posts)

Fitting questionsSoter
May 23, 2003 10:50 AM
I'm considerring getting my first road bike this summer (specifically a Trek 5200) and just have some questions about fitting and how to go about it.

I'm roughly 5'10" and my inseam is 32"-33" from what I have gathered by searching google for fitting formulas that puts me somewhere in the neighborhood of 54-56cm.

I had a chance to demo a 54cm on the '02 NE AIDSRide and it was smooth, however most of the used 5200 listed in the classifieds are at 56cm? Would bumping up the framesize 2 cm create a problem? Just asking because I'm a bit apprehensive about buying a bike online which may not fit =/
A 56 will have a longer top tube. Can you live with that ?MR_GRUMPY
May 23, 2003 11:08 AM
The Head tube will be taller also, making the bars higher. Maybe that's a good thing. Go to a Trek dealer and check out a 56.
5200 geometry pic inside.Eug
May 23, 2003 11:22 AM
I'm on a 54 and I'm 5'7" with a <31" inseam and I find the top tube a bit long for me (recreational rider on a Trek 2000), but you've got 3 inches on me, including an inch or two extra of torso. 56 might be OK. Check out the bike in a store.

Also remember that Trek measures their bikes weirdly (to the top of the seat collar). Some claim the end result is similar to C-T because of the longish eff. top tube lenghts but YMMV.
It's all ballpark unless you can try one in person...Matno
May 23, 2003 11:27 AM
Nevertheless, for what it's worth I'm 5'11" with a 33" inseam (measured floor to crotch), and I ride a 56cm frame (top tube length, center to center). I borrowed the same bike from a friend recently, but in a 54 cm size and it was DEFINITELY too small. The 56 feels perfect.
I can settle this....C-40
May 23, 2003 7:01 PM
Please post the head tube length of your Trek, not including the headset, The total head tube length with the headset, not including any spacers would be also be valuable. A typical threadless headset will have a stack height of 25-32mm.

The head tube length combined with the standover height provides a total definition of the vertical size of the bike. The horizontal dimensions are all on the geometry chart.
I fit a 54cm perfectly........tronracer
May 23, 2003 11:33 AM
and I'm 5'8" w/ a 30.5" inseam. I have a long torso so the tt didn't feel too long. I'd say go to a trek dealer and test ride a 56cm if they have one built up. Even if it's not a 5200, Trek's geometry will be the same as other models of theirs, but look at the website for geomtry to be sure b4 you go in to the lbs.
Just to make it interesting...TNSquared
May 23, 2003 11:59 AM
I'm 5'11' with a 33 inch cycling inseam, and I'm comfortably on a 58cm Trek. I do have a rather longish torso, but my limited test riding experience was that I fit on other manufacturer's 56cm frames. I won't even attempt to get into the details, but Trek apparently measures a little differently and I think their frames run a little smaller for the same listed size. But ask C-40 - he'll give you an answer that'll make your head swim.

In the end, I'd at least try a 54, 56 and a 58 to make sure you get the best fit.
the difficult part...eflayer
May 23, 2003 6:06 PM
is to get any shop to actually put you on different size bikes and then also dial in the seat height and stem extension so you can really get the feel. I am old, 5'11", have an 86 cm floor to crotch bone measurement and could not ride anything smaller than a 58. I like the bars up high and that also brings them back a bit, but I now ride either a 60 or a 62. It has taken about a year, a few frames, many stems and lots of adjusting to get dialed in to what I like. Good luck.
A good shop should do this, assuming you intend to buy from them.TNSquared
May 24, 2003 6:35 AM
I didn't read the original post carefully enough the first time. If you take alot of the shop's time trying different size frames, dialing in seat height, stem length, etc., and then you go buy somewhere else, they're probably gonna be understandably upset.

Buying used or online, I'd just give ole C-40 the stats and go with his determination. If you're new, his calculations will most likely give you a much better fit than you're sense of feel from a short test ride anyway.