Whyte 905 frame size

[3narf]

Hi, does anyone know if an 18" frame equates to a large?

I'm looking at a s/h frame on ebay. Seller says it's 18" and a large but Whyte's website doesn't give much info (actually, none of them do; why assist people looking to buy second hand, eh?)

I'm building a new bike for my son who is about 6'1 (this week).

Ta

 

[DCLane]

An 18" I think is a Medium from mine, but it always felt too big for me at 5' 9"

 

[Cycleops]

Usually an 18" MTB frame would equate to small but maybe I'm a bit out of touch with modern geometry.
Your son at 6'1" should have a 33/34" inseam so perhaps ask the seller to show a tape measured from the pedal at six o'clock, or where it would be, and post you a pic, that should should show how high he would sit above the bars. Standover shouldn't be a problem with sloping top tube but some MTB riders prefer a smaller frame on really rough stuff.
Wheel size will also have a bearing on all this.

 

[3narf]

It's a bare frame so I can only get seat tube dimensions I suppose. Wheel size is 650b.

There's also a Boardman Team frame which is slightly cheaper and definitely a large.

 

[derrick]

18" is quite large i ride a 17" my wife rides a 14" i am 5ft 7ins my wife is 5ft 2ins.