How to size a cross bike???

[colin]

I know the only real answer to this it to come into the shop and get sized...but I'm having a problem getting by there.
Is there a rule of thumb for sizing a cross bike top tube vs. a road top tube? If one must error shorter or longer vs. the road top tube, which way to go?
Thanks!

[Wrench Goode]

Rule of Thumb. One size smaller than your road frame. i.e. you ride a 60 road, cross = 58. But yes the Only Real Answer is held deep within the shop. ... May the Shop be with you. ;D

[Mike S]

I'm thinking of getting Sarah a cx bike; hopefully a Cross Check if it fits her. Is there any difference in the fitting philosophy for a cx bike, and a or road bike if you plan to use the bike on the streets as opposed to cx racing? If the cap fits, wear it right?

[Wrench Goode]

If your not racing CX or using it offroad then stick to normal sizing methods, standover then reach.