Well, I did the "fit calculator" at http://www.competitivecyclist.com/za...LCULATOR_INTRO for a road bike; then subtracted a cm from the top tube recommendations. Surprisingly it came out shorter than what I had originally assumed.

The 61cm stock frame Motobecane Fantom CX "Cross3" http://www.motobecane.com/cross/fcx3.html seemed to fit perfectly. I was able to buy a used frameset from a local cyclocross racer (don't know the exact year - but it is grey with white decals).


Motobecane Fantom CX Geometry: 61cm
SEAT TUBE, CENTER TO TOP 61cm
EFFECTIVE TOP TUBE LENGTH 590
CHAIN STAY 430
BB DROP 67.0
FORK OFFSET 45.0
HEAD TUBE ANGLE 72.0
SEAT TUBE ANGLE 72.0
WHEEL BASE 1040
STAND OVER HEIGHT 841
BB HEIGHT 283


It looks really well made. From what I gathered the 7000 series aluminum frame comes from the Kinesis plant in Taiwan and is identical to the Fuji Cross Pro & Fuji Cross Comp framsets. The front fork is steel and heavy - any recommendations for a light carbon cross fork that can hold up to my 225 lb weight?

For reference: I ride a 63cm Bianchi road bike with this geometry (and it fits like a glove).

A. Seat tube (center-to-top) 630
B. Top tube 595
C. Chainstay 418
D. BB drop 70
E. Fork rake 40


F. Head-tube angle 73.5
G. Seat-tube angle 72.5
H. Wheelbase 1019
I. BB height 270
J. Standover height (inches) 34


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The fit calculator asked for:

My Measurements

Height: 76.00 in
Sternum Notch: 61.00 in
Inseam Length: 35.00 in
Arm Length: 27.50 in
Shoulder Width: 19.00 in
Flexiblity: 5
Weight: 225.00 lbs
Foot Size: 12.00 USMens


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Then it spit out:

Recommended Road Sizes

Frame Size center-to-center: 59 cm
Frame Size center-to-top: 62.5cm
Overall Reach: 71.94 cm
Saddle Height: 78.50 cm
Handlebar Width: 46 cm


Recommended Mountain Sizes

Frame Size center-to-center: 19 in
Frame Size center-to-top: 20 in
Overall Reach: 71.94 cm
Saddle Height: 78.50 cm
Handlebar Width: 46 cm