Does anyone know if seatposts become unsafe if they are over a certain length?
I’m pretty tall, 200cm+ and need to extend my seatpost probably 2-3 inches. I know I have to leave a certain length of the post within the frame but I’d assume the longer the exposed length the weaker it would be.
I’d even go further in if you’re that tall.
I damaged the lug on great bike by extending the seatpost out too much, thankful I didn’t crack the tube- it was a hard lesson to learn.
You could go for a 410mm post like a thomson where you’ll get the extra length you need without too much weight. Pricey but worth it
from one giraffe to another I would echo hamishfs comments. go a bit further than the min insertion line ( say 20 mm), the extra moment generated from a longer post can flog out the frame.
but not to state te obvious too harshly… do you need a larger frame?