Cross frame sizing -- going from MTB to CX.

djm said:

I am planning in purchasing a CX bike, and am wondering what are the general rules for sizing,
i.e., how much crotch clearance should I have on standover?

I plan to do mostly fireroads and light trails, but would like the bike sized "small" enough to be
tossable and agile.

I am 5'9", 33" inseam (barefoot). I currently ride a Bontrager Race (MTB) with a 30 inch
standover, and 22.6" top tube.

Long legs for your height (I'm 6'4" with 34" inseam for trouser purposes, 35.75 for cycle sizing
purposes). You could probably ride a 58 cm or even a 60 cm bike in terms of height, but it'd be too
long in the top tube.

On a road bike with a level top tube, 2-4 cm of clearance is fine. On a 'cross bike, maybe double
that. It's a set of trade-offs. There are no riser drop bars, so too small a frame will result in
the bars being too low.

In article <[email hidden]>, [email hidden] says...

Quoted message said:

djm said:

I am planning in purchasing a CX bike, and am wondering what are the general rules for sizing,
i.e., how much crotch clearance should I have on standover?

I plan to do mostly fireroads and light trails, but would like the bike sized "small" enough to
be tossable and agile.

I am 5'9", 33" inseam (barefoot). I currently ride a Bontrager Race (MTB) with a 30 inch
standover, and 22.6" top tube.

Long legs for your height (I'm 6'4" with 34" inseam for trouser purposes, 35.75 for cycle sizing
purposes). You could probably ride a 58 cm or even a 60 cm bike in terms of height, but it'd be
too long in the top tube.

Those dimensions (long legs, short torso) might get a better fit from a "Women's Specific Design"

....

--
Dave Kerber Fight spam: remove the ns_ from the return address before replying!

REAL programmers write self-modifying code.