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Cannondale frame size?(6 posts)

Cannondale frame size?Wild Bill
Dec 20, 2001 4:59 AM
I ride a 53cm. Trek 5900. I want to try the new Cannondale R5000 Caad7.
I was reading about this bike and the smaller sized ones(49-54cm.) all have a sloping top tube!
Does thid mean that I would need a 52cm. in a Cannondale frame?
Thanks
no 53cm Trek 5900...C-40
Dec 20, 2001 5:56 AM
Trek does not make a 53cm 5900 model. Assuming that you ride a 54cm Trek, the 52cm Cannondale would be the closest size. The seat tube angle is the same and the standover height is nearly identical. The Cannondale top tube is 1cm shorter. This will require a 1cm longer stem.

A 54cm Cannondale will give you the same top tube length as the 54cm Trek, but the standover height is 2.1cm taller.

Neither company lists the head tube length. This is important to estimate the amount of head tube spacers that might be required.
no 53cm Trek 5900...Wild Bill
Dec 20, 2001 9:37 AM
Sorry, slip of the finger. I ride a 52cm. Trek and not a 53!
So would I need a 52cm. Cannondale?
C-dale and TrekTig
Dec 20, 2001 11:02 AM
Looking at the geometries of both bikes, you should be able to ride a 52 cm from either. They both measure the seat tube center to top. The Trek has a .5 degree steeper seat tube and a slightly shorter top tube, so a slightly longer stem than the C-dale would make it's fit close.

Take a look for yourself
http://www.trekbikes.com/bikes/2002/road/geometries/5900_geo.html
http://www.cannondale.com/bikes/02/geo-7.html
close, but not quite...C-40
Dec 20, 2001 3:32 PM
Trek measures the entire seat tube length to yield the advertised frame size. This is not the same as traditional center to top of top tube measurement. Trek's measure about the same as a c-t frame that is 2cm smaller.

The 52cm Trek has a steep 75 degree STA, while the C'dale's is 74.

The Trek's 53.1cm TT is effectively .7cm longer than the 53.5cm TT of the 52cm C'dale, due to the difference in STA. A longer stem will be required on the C'dale, if the saddle is positioned for the same KOP.

The standover height of the 52cm C'dale is 1cm taller than the Trek. This is unlikely to cause a problem. The head tube length is on the C'dale is probably a little longer also.
why does Trek's geometry page show it to be different?Tig
Dec 20, 2001 6:35 PM
You're right. I was reading a different frame size.

The current Trek frame geometry diagram shows a center to top measurement. I know they measured center to top of seat tube in the past, like on my '99. It's confusing, huh? I guess the only way to know if they changed actual measurements to match their diagrame is to hand measure a new frame at a shop.