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How do I measure a 2008 Giant TCX frame?

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How do I measure a 2008 Giant TCX frame?

Old 07-17-13, 09:08 PM
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bobotech
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How do I measure a 2008 Giant TCX frame?

I got a really pretty Giant TCX frame from 2008. I'm not sure how to measure the size. There are no stickers in regards to the size.

The problem is that there are no stickers on the tube mentioning size. I'm not sure how to measure it since it is using a sloping top tube. I have a 56.5" Specialized Sequoia Elite that is slightly too tall for me but I manage with it since its top tube is sloping and allows me to fit over the bike and I put a short stem on it 90mm.

So I want to figure out the exact size of the Giant but I'm not sure how to measure these sloping top tube bikes.
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Old 07-17-13, 09:20 PM
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Many experienced riders pay more attention to the seat/bars relationships then the amount of seat post extending out of the ST (as in frame size).

What's it mater if the manufacture says the size is XX if your fit is right for you?

Compounding the size issue is that different manufacturers measure "size" differently. Most all start at the BB center. But some go up the ST to it's center point with the TT, or the top surface of the TT, or the top of the ST extension above the TT, or the virtual point that the TT and ST intersect (some vague dimension above the TT) where the resulting TT would be horizontal.

So pick your method and just be consistent in how you measure the bikes you consider. And again, remember it's pedal to seat, seat set back, seat to bars and bar drop ( or rise) that really counts. Any dimensions between are for the sales guys. Andy.
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Old 07-17-13, 09:28 PM
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Originally Posted by bobotech View Post
So I want to figure out the exact size of the Giant but I'm not sure how to measure these sloping top tube bikes.
Click on the bike model and then click on GEOMETRY.


http://www.giant-bicycles.com/en-us/...archive/?q=tcx
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Old 07-17-13, 09:29 PM
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I measured the stem to where the seatpost meets the seat and its roughly about 1/2 inch shorter than say on my Specialized. I just wonder if that is going to make a huge difference or not.
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Old 07-17-13, 09:30 PM
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I always measure the seat tube length and top tube length as starting points. Then definitely look at saddle-to-bar drop once the saddle is close to the right spot. Then I measure from the saddle clamp to where the bars are clamped to really get a good idea of reach. The nice thing is that you can measure any bike this way no matter what the geometry.

Originally Posted by Andrew R Stewart View Post
So pick your method and just be consistent in how you measure the bikes you consider. And again, remember it's pedal to seat, seat set back, seat to bars and bar drop ( or rise) that really counts. Any dimensions between are for the sales guys. Andy.
+1
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Old 07-17-13, 09:38 PM
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Originally Posted by cobba View Post
Click on the bike model and then click on GEOMETRY.


http://www.giant-bicycles.com/en-us/...archive/?q=tcx
Got it. Turns out my bike is a medium.

I will outfit it with a longer stem than say the 90mm that I have on my Sequoia and adjust the seatback as well and see how it feels to me.
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Old 07-17-13, 09:42 PM
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Originally Posted by bobotech View Post
I will outfit it with a longer stem than say the 90mm that I have on my Sequoia and adjust the seatback as well and see how it feels to me.
Don't adjust the saddle to change the reach (if that's what you were going to do.) The saddle needs to be in the correct position for pedaling.

Half an inch reach sounds completely fixable with a different stem.
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Old 07-17-13, 09:53 PM
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Originally Posted by FastJake View Post
Don't adjust the saddle to change the reach (if that's what you were going to do.) The saddle needs to be in the correct position for pedaling.

Half an inch reach sounds completely fixable with a different stem.
No I wasn't going to adjust the saddle to change the reach, I was going to set it as compared to my other bikes and start from there. Once nice thing about having a crapload of spare parts is that I can play with different parts and see what works best and go from there. And if that doesn't work, I can grab more stuff from the co-op.

I just wonder if the Sequoia is a bit large for me which causes my hands to go numb once in a while.
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Old 07-18-13, 02:42 AM
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The up-and-coming way of looking at frame sizes seems to be the "stack and reach" concept, quite nicely described here:http://www.cervelo.com/en/engineerin...y-and-fit.html

If I have enough parts available, I much prefer to mock things up. I'll start with a bike I'm comfortable on, prop it up vertical, then use a plumb line and a yardstick to see where my hands goes WRT BB center. Same method for figuring out where on the saddle my sit bones will usually reside.

With the different angles used by the different makers, the separate measurements aren't more than rough ballpark values.
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Old 07-18-13, 03:10 PM
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I do like the concept of "stack and reach". But these terms might be confusing as 'stack" can also mean the amount of spacers under the stem and reach often is thought of as the seat tip to the bars. What "stack and reach" does is to establish a set manor of measuring the frame. So a Trek will be measured with the same points as a Specialized.

This standardization is a good thing. For too long the dimensioning of bikes has been co-opted by the marketing department. Next should be tires... Andy.
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Old 07-19-13, 03:44 AM
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Originally Posted by Andrew R Stewart View Post
I do like the concept of "stack and reach". But these terms might be confusing as 'stack" can also mean the amount of spacers under the stem and reach often is thought of as the seat tip to the bars.
Well, that's the trouble with late changes to the game. All the parts have already been around for quite some time, so all obvious names have already been used for something else. One could of course invent new names, but unless they're ingeniously descriptive, odds are that they'd cause more issues than they'd resolve.

Originally Posted by Andrew R Stewart View Post
.. What "stack and reach" does is to establish a set manor of measuring the frame..
I rather like the bit where they showed how some frames grew very differently in height compared to length from one size to the other.

Originally Posted by Andrew R Stewart View Post
Next should be tires... Andy.
What I'd like to see added is a measurement of how wide the tire is when laid flat, measured from bead-to-bead. That together with the inner width of the rim allows excellent prediction of which tire fits where - assuming a similar tread height.
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