One of my bike is this little Dohiker 14" electric bike, but I actually pedal a lot when riding it, and the seatpost is a bit too short. It is about 50cm long, and I would need a few more centimeters. I'm already exceeding a bit the minimum insertion length, but it's not sufficient. Also, such long seatposts apply a lot of force on the frame because of the leverage, so I really have to insert a safe length of seatpost in the frame.
Problem: the diameter is a quite uncommon 30.4mm, and such long seatpost is also uncommon. I searched everywhere for a 30.4mm × 550~600mm seatpost, without success...
So far, after already a lot of research, my best (and only) solution would be to use these two parts:
- This 30.4mm → 27.2mm adapter (I'm considering this model because it's 10cm long, whereas other models are 8cm or 6cm long only…)
- This 27.2mm × 600mm seatpost (I think it's initially intended for BMX)
Do you think this solution is acceptable? Do you have better proposals?
(and extra kudos if you find a similar seatpost (27.2mm × 600mm, color black), but without any branding on it :)