[klunky]

Im fairly close to getting a Nicolai ion ST but cant decide what size I need.
The geometry on the Nicolai site seems to show the top tube a little on the short side - http://nicolai.net/pdf/Ion ST 2010.pdf
I cant tell if thats actual or effective top tube.
If its "effective" even the large seems a little short for me (just under 6 foot)
If its "actual" is there anyway to calculate the effective TT?

Thanks for any help!

 

['size]

based on the graphic it's effective.

 

[Dogboy]

based on the graphic it's effective.

Agreed. And it looks like the steep seattube angle is the cause of the relatively short toptube.

 

[jonKranked]

what about affective top tube?

 

[klunky]

Agreed. And it looks like the steep seattube angle is the cause of the relatively short toptube.

Thats exactly what I think the issue is.
Im trying to get the stack/reach details which will sort me out.

 

[miuan]

I had this exact issue with my medium 09 Wilson. Bought a SDG I-beam setup, pushed the saddle farther back and enjoyed my ride ever since (I'm 5'10). Be careful with the plastic rails, they snap off if pushed too far due to high leverage. Your best bet is to buy a SDG saddle and Kore I-beam layback post. As for stack/reach, I think you will be fine with the medium. It seems plenty long with a short chainstay, like the older demos.

 

[Ithnu]

On DH bikes I look at wheelbase - chain stay. Since you're not sitting down most of the time your reach is really from where your feet are to your bars. Seat tubes, if you continue them to the height of the BB, start further forward on different bikes. So you'll have a shorter TT measurement (effective or not) in comparison to bikes with the same "reach" as I call it.

The comment on seat tube angle is also a good point, it will vary between brands.

I think the wheel base and chain stay is a more consistent way. Anyone else look at this?