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Quick Fit Question(6 posts)

Quick Fit Questionwerdna
Jan 31, 2003 7:35 AM
I'm riding a 60cm Cdale (C-T) right now and I have always felt too stretched out. I want to feel more compact. My saddle from the center of the BB to the top of the saddle is 78cm and from the top of the TT to the top of the saddle is 18cm (both measured parallel to the seat tube). I like how the frame fits vertically. I do not like the long top tube. Am I crazy to consider going down to a 58 or 59 Cdale? I have to stick with Cdale because I'm getting a team frame and custom isn't an option. I am young so I could probably tolerate a big saddle to bar drop.
Thanks,
Andrew
Shorter stem? nmdzrider
Jan 31, 2003 8:12 AM
Not possiblewerdna
Jan 31, 2003 8:53 AM
I'm on an 11cm stem now and since I live in NJ and I will have to races tons of crits I don't want too twitchy handling.
-Andrew
it's possible....C-40
Jan 31, 2003 9:09 AM
C'dales only come stock in 2cm increments. The difference in TT length between a 58 and a 60cm frame is only 1cm, once you correct for the .5 degree difference in STA.

The saddle height that you posted tells me that your current frame has the proper vertical size.

The idea that using a 10cm stem instead of an 11cm is will cause the steering to be twitchy is not justified.

The length of the "steering arm" is the dimension to compare. The steering arm is a straight line from the point where your hands contact the handlebars or brake hoods to the center of the steering tube. With a 11cm stem this length is about 12 inches to the brake hoods. A 1cm reduction in the stem length will only change the steering arm length by about 2.5%. This amount is so small that you will become accustomed to the difference within a couple of rides.

Changing between an 8cm and a 12cm stem only changes the steering arm length by 10%. This amount would certainly be noticeable, but it's just a matter of what you get used to.

I'm experimenting right now with a further-back saddle position and just changed from an 11 to a 10cm stem to restore the reach to the proper length. I anticiapate no problem from this change. When I first built the bike, I used a 12cm stem. After using an 11cm for years, I did notice a little difference (felt a tad slow), but after a few rides it was normal to me.
it's possible....castrello
Jan 31, 2003 12:08 PM
Well, this is me, hope it helps

187 cm
89 cm inseam
67 cm arms
80.5 cm saddle height

Bike

Caad 7, size 60
13 cm stem (would be nicer with a 12, or maybe an 11?)
Saddle to TT drop, approx 21 (?) cm. Saddle to bar drop: don´t know (between 2 and 3 inches?).

Since you´re an racer, the additional 2 cm drop shouldn´t be a problem, but then again - as C40 pointed out - the difference in effective reach is only one cm. And I would definitely try a 10 cm stem for a while before going for a smaller frame. However, if you´re buying frame only, and you´re sponsored, then maybe a size 59 would be perfect?
it's possible....werdna
Jan 31, 2003 1:31 PM
You are right with the stem length size, but since it will be a racing frame, I decided to go with a 58. Right now the saddle to bar drop is 11 cm (measured from center of bar to top of saddle) and I feel very comfortable. Sometimes, however, I feel when racing that I'm too upright. I don't feel all that comfortable in the hoods and it's hard to make my arms parallel to the TT while in the hoods for a break-away position.

The difference in TT length, however, is 1.5 cm (59cm to 57.5cm) and the STA angles are the same (I'm going from a CAAD 3 to CAAD 7). As far as the other differences in the geometry will an increased fork rake (43 to 45) have a pronounced affect on handling? There is also a 1.3cm difference in wheel base.

I think if I bought a non-racing bike I would go for a manufacturer with less-square geometry. Beside Colnago, do you have any suggestions.

Thanks for your insight,
Andrew