I currently ride a 18 stumpy, and a Medium sized S-works epic.

I'm more then likely going to get a Canondale Lefty next, and was wondering would a medium be the right sized frame for me..

Thanks in advance, Fletch.

How tall are you/inside leg & what cannondale?
The lefty is the fork, not the frame model..

I'm about 5.10'' approx 30 inside leg.

Yeah I know the lefty is the fork, my mistake. The bike in question is a Cannondale Flash Hi- Mod 2

I'd have thought medium. I'm 5' 11" + a bit + find Cannodale mediums just too small, + the Larges just too big with standard set ups.

At 5'11" I'm sort of between sizes too. I have a large Rush with an inline post and 90mm stem (about as short as you can go with a lefty) that is great apart from on the steeps and tech stuff where I struggle to get weight back, and a medium Prophet MX with a layback post that is a bit short for climbing but rocks on the descents.

I'd think a medium would be a better bet but would really recommend you give both sizes a try…

Deffo a medium – I;m 5'9", 31 inside and have a medium jekyll and a medium gemini. Prev had a large jekyll and it was too big & gate-like.

Thanks for the replies guys.

Looks like Medium is the one to test ride-buy then.