planet x nanolight geometry

alp aslan

Hi, I decided to buy a nanolight but planet -x customer service can't help about sizing.
I have to learn c-c size because my height is beetwen s and xs. I can't imagine toptube higher or lower from seat tube top. nanolight users please help; howmuch is lenght beetwen toptube and seattube or please look in the below picture

amaferanga

Why is this measurement so important to you? Surely the most important measurement is top tube length which Planet X give you on their website?

I have a small Nanolight - I'll measure 'x' tonight if I remember. FWIW I'm 5'8" and the small is on the small side for me (which is how I wanted it). I'm running a 110mm stem and have quite a drop from saddle to bars.

Squillinossett

If it helps, I have just got a large nono light and im 6 foot 1

fleshtuxedo

x is more or less exactly the 'opposite' of a triangle from centre of BB to top of x to top of seat tube, and the seta tube is the hypoteneuse. So do a bit of trigonometry and you can get x. This is where I'll start struggling, but I think it's:

Tan = Opp/Adjacent, so

Tan of 74degrees or whatever the seat tube angle is = x/seat tube from centre BB to top.

Voila. I'll let you do the rest (Google tangent value for seat tube angle and fill in seat tube length).

fleshtuxedo

After 26 years, learning trigonometry for Maths O level finally proves its worth :?

cougie

PX helped me out with sizing - I said one size and after giving my measurements in - they advised me to (correctly) go one size up. Perfect. I'd listen to them.

amaferanga

The measurement on my small Nanolight (53.5cm top tube) exactly as indicated (centre of BB vertically to centre of top tube) is 47cm.